Seyed Ali Delbari

Ferdowsi University Of Mashhad | FUM · Department of Materials Science and Engineering

The urgent issues related to the catalytic processes and energy applications have accelerated the development of hybrid and smart materials. MXenes are a new family of atomic layered nanostructured materials that require considerable research. Tailorable morphologies, strong electrical conductivity, great chemical stability, large surface-to-volume...

The need for sustainable and ecofriendly materials has grown due to practical considerations over the past few decades. Metal-organic frameworks (MOFs) have drawn significant interest due to their distinctive and intriguing chemical and physical properties as they have been utilized in a variety of chemistries to convert biomass into biofuels and o...

The practical benefits of sustainable catalysts have incessantly increased their demand over the past few decades. For chemical processes, extended carbon supported nanocatalysts are useful because of their high porosity area and appropriate physiochemical stability. In numerous catalytic processes, they have been employed to convert biomass into v...

A carbon-fiber (Cf) doped TiB2–SiC composite was prepared and investigated to determine its densification behavior, micro/nanostructural properties, and mechanical characteristics. TiB2–25 vol% SiC–2 wt% Cf was prepared at 40 MPa and 1800 °C for 7 min using the pulsed electric-current sintering technique, and a relative density of 98.5% was realize...

This study assessed the sinterability and microstructure of ZrB2-SiC-TaN and ZrB2-TaN ceramics. Spark plasma sintering at 2000 °C and 30 MPa for 5 min produced both ceramics. The relative density of ZrB2 ceramic containing TaN was 95.3%; the addition of SiC increased this value to 98.1%. SiC’s contribution to the elimination of ZrB2 surface oxides...

This study assesses the influence of added iron (Fe) nanoparticles on the sinterability, microstructure, and mechanical characteristics of SiC-enforced ZrB2 ceramics. The specimens were sintered under 30 MPa at 1700 °C for 5 min using the spark plasma sintering method. The SiC-free sample presented near full density; however, the incorporation of S...

The microstructural characterization of spark plasma sintered (SPSed) TiB2–20SiC–5Si3N4 composite was investigated precisely by high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The in-situ phases generated during SPS process were studied using HSC chemistry software; the result shows the developme...

The impact of adding 20 vol% SiC on the properties of TiB2 was studied in this research. The spark plasma sintering (SPS) process was used as the preparation technique at 1850 °C, the resulted composite was characterized using X-ray diffraction (XRD), field emission electron probe micro analyzer, transmission electron microscopy (TEM), field emissi...

This research intends to implement a complementary study on the consolidation and microstructure of TiC-based ceramics incorporated by 30 vol% TiB2 and 10 vol% SiC whiskers (SiCw). The spark plasma sintering was employed as the manufacturing tool to produce the designed composite under the sintering pressure of 40 MPa for 7 min at 1900 °C. The X-ra...

In this research, we performed studies on the in-situ formation of carbon in the ZrB2–25 vol% SiC composite prepared by the spark plasma sintering (SPS) process at 1850 °C. The sintering behavior, microstructure, and mechanical properties of the resulted composite were also evaluated. The sample showed excellent sintering behavior, and a relative d...

The objective of this paper was to study the impact of carbon fiber (Cf) addition on the densification behavior and the microstructure formation of ZrB2 reinforced with SiC whiskers (SiCw). The spark plasma sintering (SPS) performed at 1900 °C led to a near fully dense composite as a result of the synergetic effect between SiCw and Cf on the sinter...

In this paper, (Co–TeO2) nanostructures were synthesized using the microwave-assisted method for the fabrication of (PVP:Co–TeO2) as an organic interlayer (OI) at Al/p-Si interface. Structural and optical properties of nanostructures were investigated through XRD, SEM, EDX, and UV–Vis techniques. The interface states (Nss) energy dependence diagram...

A novel TiB2-based composite, with metallic vanadium and nano-graphite additives, was fabricated by spark plasma sintering. A comprehensive investigation was carried out to clarify the sintering behavior and interfacial phenomena. The in-situ synthesis of crystalline V3B4, V6C5, and TiC phases was proved. The formation of V6C5 was attributed to the...

This investigation aimed to assess the discrete and synergic impacts of SiC whiskers (SiCw) and nano-sized WC (WCn) on the microstructure of TiC-based materials. Three dense specimens of TiC−3 wt% WCn, TiC−30 vol% SiCw, and TiC−30 vol% SiCw−3 wt% WCn were yielded using the spark plasma sintering (SPS). The X-ray diffraction patterns (XRD), as well...

This research aimed to assess the effect of various nitride additives, i.e., AlN, hexagonal BN, Si3N4, TiN, and ZrN, on the sinterability, microstructure, and mechanical-physical characteristics of TiC-based materials. All ceramics were sintered at the same sintering conditions using the spark plasma sintering (SPS) process. A relative density over...

The present investigation was carried out to illustrate the effect of TiCN on the microstructure development of spark plasma sintered fully dense ZrB2-based ceramics. The microstructural observations, X-ray diffraction patterns, and field emission-electron probe microanalysis revealed the presence of the (Zr,Ti)B2 and ZrCN phases in the final micro...

This investigation aims to evaluate the influence of SiC introduction on the microstructure development, mechanical characteristics, and densification behavior of (Zr,Ti)B2–ZrC materials. Two specimens, with/without SiC addition, were manufactured from the starting materials of ZrB¬2 and TiC by reactive spark plasma sintering (SPS) at 1800 °C under...

This examination intended to evaluate the synergic influence of graphene nano-platelets (GNPs) and AlN on the microstructure and consolidation behavior of TiC. The spark plasma sintering (SPS) method was employed as the manufacturing process under the sintering circumstances of 40 MPa, 10 min, and 1900 ºC. The simultaneous incorporation of AlN and...

A novel TiC-based material was fabricated by introducing Si3N4 and carbon nanotubes (CNTs) additives to enhance the thermal conductivity, flexural strength, and hardness of TiC. Spark plasma sintering route was used to produce four different specimens of TiC, TiC-5 wt% CNTs, TiC-5 wt% Si3N4, and TiC-5 wt% CNTs-5 wt% Si3N4. Though the individual imp...

This research explores the sintering behavior and microstructure of ZrB2-based materials containing graphene nano-platelets (GNPs) and SiC whiskers (SiCw). Spark plasma sintering (SPS) process at 1900 ºC was implemented to sinter the specimen, leading to a composite with 100% relative density. High-resolution transmission electron microscopy (HRTEM...

The objective of this study was to assess the impacts of carbon nanotubes (CNTs) incorporation on the mechanical characteristics, thermal conductivity, microstructure, and sintering behavior of titanium carbide (TiC) matrix ceramics. To this aim, two samples of TiC-CNTs and monolithic TiC were produced using the SPS process at 1900 ºC. The results...

Introducing the SiC additive resulted in a noticeable enhancement in the sintering behavior of the ZrB2-hBN composite, profiting from the SiC involvement in the surface oxide removal. This research intended to compare two ceramics of ZrB2-hBN and ZrB2-SiC-hBN in terms of sinterability, microstructure, and mechanical features. Both samples were spar...

All over the world, the research done on designing the novel methods for inventing flexible electrochemical energy storage devices is becoming of more interest each day while the development of new technology in fields such as public wearable, consuming portable electronics, and electronic skin proceeds. Taking their large power density, cyclic sta...

Various carbonaceous phases have different impacts on the qualifications of ZrB2-SiCw based ceramics. In this research, 5 wt% of different forms of carbon, namely carbon nanoparticles, carbon fibers, graphite, and graphene, were added to ZrB2-25 vol% SiCw composites sintered by spark plasma under 40 MPa at 1900 °C external pressure for 7 min. All s...

The present study aims to investigate the effect of (PVP: Sn-TeO2) interfacial layer on the electrical parameters of the Al/p-Si diode. For this aim, (Sn-TeO2) nanostructures were developed by the ultrasound-assisted method, and both their electrical and optical characteristics were investigated by XRD, SEM, EDS, and UV-Vis methods. The bandgap of...

Sintering behavior of ZrB2 ceramic with nano-sized SiC dopant was studied. ZrB2-25 vol% nano-sized SiC was selected as the starting mixture to fabricate the composite. The manufacturing process was accomplished at 1800 °C for 5 min under 25 MPa via spark plasma sintering (SPS). The as-sintered sample reached a relative density of 99%. Besides the i...

This research aimed to compare the TiC and TiC-Si3N4 ceramics in terms of sintering behavior and physical-mechanical characteristics. The spark plasma sintering (SPS) process was used as the fabrication route with the sintering conditions of 1900 ºC, 7 min, and 40 MPa. The results confirmed the deposition of carbon in the monolithic TiC during the...

In this work, the CNNS/Ag/AgFeO2 photocatalysts were synthesized by the thermal polymerization-hydrothermal method, aiming for photocatalytic degradation of RhB under visible irradiation. Different advanced techniques such as X-ray diffraction analysis (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy...

The impact of Si3N4 and SiC additives incorporation in the microstructure and sintering behavior of TiB2-based composites were studied. Three ceramic composites including TiB2-Si3N4, TiB2-SiC, and TiB2-SiC-Si3N4 were manufactured by spark plasma sintering (SPS) at 1950 °C for 8 min under 35 MPa. The acquired ceramics were analyzed by X-ray diffract...

Ti–10 wt% Mo–1 wt% B4C composites were fabricated using spark plasma sintering (SPS) technique to study the effect of sintering temperature and dwell time on their microstructure and mechanical properties. The composites were sintered at different temperature degrees (1150, 1300 and 1450 °C) with dwell time of 5 and 10 min under the external pressu...

Three near fully dense TiB2–SiC composites were achieved, benefiting from the coaddition of SiC and a nitride compound (Si3N4, h-BN or TiN). All composites were produced by spark plasma sintering (SPS) at 1900 °C. The in-situ formed TiC phase was identified in the all three composites due to occurring a chemical reaction between TiO2 oxide and SiC...

The impact of the AlN additive on the microstructural features and consolidation behavior of the ZrB2-SiC system was studied. For this objective, different weight percentages of AlN were added to the ZrB2-30 vol% SiC ceramics, in which 4 wt% phenolic resin was used as a binder. All specimens were hot-pressed at sintering circumstances of 1900 °C un...

In this paper, the effect of TiN and nano-diamond additives on the microstructure and properties of TiC-based composites, produced by spark plasma sintering method, was investigated. The thermal conductivity of TiC ceramic was improved significantly due to the incorporation of nano-diamond additive. Although the introduction of diamond worsened the...

This examination is aimed to study the various densification mechanisms in the ZrB¬2-SiC system at different sintering temperatures. For such an objective, hot-pressing process was implemented to fabricate three ceramics at sintering temperatures of 1650, 1850, and 2050 °C under 10 MPa for 1 h. According to the results, particle rearrangement and f...

Novel TiC-based composites were produced by incorporating ZrN and carbon black additives to improve their flexural strength. Spark plasma sintering method at 1900 °C was implemented to fabricate the designed composites; i.e., monolithic TiC, TiC-5 wt% carbon black, TiC-5 wt% ZrN, and TiC-5 wt% carbon black-5 wt% ZrN. Carbon black enhanced the sinte...

In this study, a graphite and h-BN added TiC-based ceramic was produced by spark plasma sintering at 1900 °C. The sinterability of the graphite-doped sample could be improved, because undesirable TiO2 oxide layers were generally eliminated at the temperature of ~1300 °C. However, the co-addition of graphite and h-BN additives simultaneously had a d...

The impact of AlN addition on the microstructure and sinterability of ZrB2-SiC composites was studied. The pressureless sintering and hot-pressing techniques were used as manufacturing methods. The composites produced by hot-pressing method were sintered at 1900 °C, producing fully dense products with 1 and 5 wt% AlN. X-ray diffraction (XRD), and e...

For the investigation of the influence of (PVP: Zn-TeO2) interphase layer on the electrophysical parameters, Al/p-Si structures with/without (PVP: Zn-TeO2) interlayer grown by spin coating technique and then these factors were studied by I-V and Z-f measurements. Firstly, the FE-SEM, XRD, EDS, and UV-Vis analyses techniques were performed to invest...

The densification behavior and mechanical properties of spark plasma sintered titanium-molybdenum alloys were investigated in this paper. All Ti-(4, 8, 12, 16, and 20 wt%) Mo samples were sintered at 1200 °C for 5 min under 50 MPa. A significant relative density of 99.9% was secured for the Ti-based alloy with 16 wt.% Mo. The overall trend of hardn...

Fully dense TiC-based composites were produced by spark plasma sintering at 1900 °C with introducing AlN and graphene nano-platelets (GNPs) additives to the TiC matrix. The participation of AlN in removing oxygen-bearing species (i.e., TiO2) has been found to be explicable for boosting the sinterability of TiC. TiN was formed in-situ as a product o...

The present research aims to investigate the influences of SiC reinforcement and h-BN additive on the relative density, microstructure, and thermodynamic aspects of TiB2-based ceramics. Three different specimens, including monolithic TiB2, TiB2-SiC, and TiB2-SiC-BN were fabricated using spark plasma sintering (SPS) at 1900 °C. A dwelling time of 7...

This study explores the impact of AlN on the propagation of residual porosity and microstructure of porous ZrB2-SiC-based composites. Several ZrB2-SiC composites were fabricated with various amount of AlN by pressureless sintering method at 1900 °C. The specimens were kept at the maximum temperature for 120 min. Although the AlN-free composite poss...

In this study, the spark plasma sintering technology was implemented to produce hybrid zirconium diboride ceramics comprising of silicon carbide whiskers (SiCw: 25 vol%) and various amounts of graphene nano-platelets (Gnp: 0-7.5 wt%). The effects of nano-graphene addition on the structural evolution, hardness, fracture toughness, and densification...

This investigation aimed to study the influence of carbon black on the qualifications of TiC-based materials. For this objective, two samples, namely monolithic TiC and TiC-5 wt% carbon black were sintered by spark plasma sintering (SPS) method at 1900 °C. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to...

In the present study, we incorporated AlN (5 wt%) with TiB2 ceramic and consolidated the mixture by relatively low temperature sintering method, resulting in a near fully dense composite. Monolithic TiB2 and TiB2-AlN (5 wt%) were manufactured by spark plasma sintering (SPS) at 1900 °C for 7 min under 40 MPa. The prepared composites were precisely c...

This study aims to investigate the impact of zirconium nitride (ZrN) additive on the microstructural features and physical-mechanical characteristics of TiC. For this objective, two different samples, namely monolithic TiC and TiC-5 wt% ZrN, were produced by spark plasma sintering method at 1900 °C for 10 min under 40 MPa. X-ray diffraction, field...

The spark plasma sintering process was implemented to produce four different composites, namely Ti-10 wt% Mo-(0.5, 1, 2, and 4) wt% (TiB2 + TiC). All samples were sintered at 1300 °C for 5 min under 50 MPa. A full study was carried out on the mechanical properties and the relative density of these SPSed composite samples. The best relative density...

The impact of introducing nano-sized ZrO2 additive on the sinterability and microstructure development of ZrB2–SiC composite was studied. The spark plasma sintering (SPS) technique was selected as the manufacturing method, and the as-sintered sample reached a relative density value slightly higher than 98.5%. Advanced electron microscopy techniques...

The impact of SiAlON on densification behavior and microstructure of the ZrB2-SiC composite was investigated. ZrB2, SiC, and SiAlON were used as the initial materials to produce ZrB2-SiC composite by hot pressing at 1900 °C. A fully dense composite was obtained having ~99.9% relative density. High-resolution X-ray diffraction (HRXRD) assessment ver...

This paper aims to study the impacts of h-BN additive on the microstructural features and sintering behavior of TiB2. For this objective, two different samples of monolithic TiB2 and TiB2-5 wt% h-BN were fabricated using spark plasma sintering (SPS) technique at 1900 °C. An external pressure of 40 MPa was exerted to the specimens during the sinteri...

This investigation intends to study the influence of titanium nitride (TiN) additive on the sintering behavior, mechanical features and microstructural development of TiC-based substances. For this objective, two different samples, namely monolithic TiC and TiC-5 wt% TiN, were sintered at 1900 °C using the SPS method. The specimens were held at the...

This research aims to scrutinize the impact of graphene additive on the consolidation behavior, microstructure and physical-mechanical qualifications of TiC-based materials. For this purpose, two specimens, namely monolithic TiC and TiC-5 wt% graphene, were produced using the spark plasma sintering (SPS) method at 1900 °C. An external pressure of 4...

Monolithic titanium and composites doped with 0.24, 0.48, 0.96 and 1.92 wt.% B4C were sintered by SPS method at 1200 °C for 5 min under 50 MPa. The effect of B4C as a sintering aid on sintering behavior, microstructure and mechanical properties of the composites were investigated. The maximum relative density of 99.93% was obtained for the sample d...

This research deals with the impacts of nano-diamond addition on the densification behavior and mechanical/thermal properties of titanium carbide processed by the SPS method. For this purpose, 5 wt% nano-diamond was introduced to TiC-based ceramics sintered at a 1900 °C under an external pressure of 40 MPa for 10 min. As-sintered samples were chara...

In this research, various amounts of nano-sized tungsten carbide (WCn: 0, 1.5, and 3 wt%) were added to TiC-10 vol% SiCw system. All samples were sintered at 1900 °C under an external pressure of 40 MPa for 7 min by spark plasma sintering (SPS) procedure. Microstructural, thermodynamical, and XRD evaluations revealed the formation of non-stoichiome...

In this work, the monolithic TiC and h-BN doped ceramics were spark lasme sintered at 1900 °C for 10 min under 40 MPa. The sinterability and physical-mechanical qualifications of as-produced specimens were studied to assess the impacts of the h-BN additive on TiC-based composites. Adding h-BN did not have any evident effect on the relative density...

5 wt% AlN was added to TiC-based samples spark plasma sintered at 1900 °C under 40 MPa for 10 min. XRD and microstructural assessments confirmed the in-situ formation of Ti3Al during the sintering process. The densification behavior and mechanical properties of the undoped and doped samples were studied to evaluate the impact of AlN addition and Ti...

In this research, 5 wt% nano-graphite was added to titanium carbide and its impacts on the microstructure and mechanical qualifications were evaluated. Monolithic and graphite-doped TiC samples were manufactured at 1900 °C under 40 MPa for 10 min by spark plasma sintering method. Graphite nano-flakes enhanced the densification behavior, flexural st...

Four hybrid titanium-based samples with different amounts of B4C as reinforcement and the same numbers of specimens with TiB2 + TiC additives were produced using the SPS method at 1200 °C. For a reliable comparison, stoichiometry relations of starting powders were applied to estimate the precise contents of mentioned reinforcements to reach the sam...

The effect of adding various amounts of nano-diamond additive (0, 1, 2, and 3 wt%) on the densification behavior and mechanical properties of ZrB2-25 vol% SiC samples were investigated in this research. All samples were spark plasma sintered at 1900 °C under 40 MPa external pressure for 7 min. Relative density (RD) values higher than 99.9% were obt...

In this study, the influence of adding 0, 10, 20, and 30 vol% SiCw on the microstructure and mechanical properties (relative density (RD), flexural strength, and Vickers hardness) of TiC-3 wt% WCn was investigated. All designed samples were spark plasma sintered under the same conditions: sintering temperature of 1900 °C, external pressure of 40 MP...

The impact of various volume percentages of TiB2 additive (0, 10, 20, and 30) on the microstructure, relative density (RD), Vickers hardness, flexural strength, and thermal conductivity of as-sintered TiC-10 vol% SiCw-based composite samples were scrutinized. All four samples were sintered using the SPS method under the following circumstances; sin...

Ti–10 wt% Mo–1 wt% B4C composite samples were SPSed under the circumstances of 5 min dwell time, 50 MPa external pressure and sintering temperatures of 1150 °C, 1300 °C and 1450 °C. The role of sintering temperature on the relative density, microstructure and mechanical characteristics of as-sintered specimens were studied. Near fully dense relativ...

Spark plasma sintering method was utilized to produce monolithic Ti and four composite samples with different amount of TiB2 and TiC as additives. The sintering conditions of 1200 °C for 5 min under 50 MPa external pressure was employed for SPS process. The effect of different amount of additives was studied on the relative density, microstructure...

The effects of adding SiC as a reinforcement and TiN as an additive on TiB2-based composites fabricated by the spark plasma sintering (SPS) technique were investigated. SPS was implemented at the sintering conditions of 1900 ˚C temperature, 7 min holding time and 40 MPa pressure. Adding these two secondary phases had noticeable effects on the micro...

In this study, the impact of TiN as a sintering aid on the relative density and microstructure of TiB2 ceramic was investigated. Monolithic TiB2 and TiB2 doped with 5 wt% TiN were sintered at 1900 ˚C for 7 min dwell time under the pressure of 40 MPa by spark plasma. The addition of TiN affected the microstructure of TiB2-based sample considerably d...

In this research, we investigated the effects of SiC and multi-walled carbon nanotube (MWCNTs) addition on the densification and microstructure of titanium nitride (TiN) ceramics. Four samples including monolithic TiN, TiN-5wt% MWCNTs, TiN-20 vol% SiC and TiN-20 vol% SiC-5 wt% MWCNTs were prepared by spark plasma sintering at 1900˚C for 7 min under...

The book deals with scientific, experimental and technical issues about Ultrasonic Testing.

An official Persian translation of the Prof. John Campbell's 2nd reputed book, "Castings Practice: 10 Rules of Castings"

Honeycombs are known as structures which present special and unique properties. They are used in various industries and in particular aerospace industry. The effect of casting temperature and inner wall thickness of honeycombs on fillability and structural integrity of the samples were studied in this research. Various honeycomb samples of 13mm hei...