Ceramics - Science topic
Products made by baking or firing nonmetallic minerals (clay and similar materials). In making dental restorations or parts of restorations the material is fused porcelain. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Boucher's Clinical Dental Terminology, 4th ed)
Questions related to Ceramics
Does the Calcination temperature required for preparation of ceramic sample change with whether ( India- summer temp 30-40deg, winter temp-5-10deg)?
I want to make a biocomposite using chitosan and hydroxyapatite. How can I proceed to make samples to characterize mechanical properties?
I am getting extremely less value of piezoelectric coefficient d33 of Li doped KNN ceramic as reported in literature at MPB . What could be the reason?
I want to develop a chitosan matrix-based composite with ceramic powder reinforcement.
how should I proceed? what is the best method for composite development,
Does the produced charged species after each test will affect the following test if I didn't change the solution and repeat the experiment for several times?
Based on your experience, how many test did you repeat for each sample typically?
How should I calculate the equivalent weight(EW) if I deposit some ceramic coating (thickness-several microns) on the surface of SS304?
FYI: MULTIPORT™ corrosion cell kit: a working electrode, a graphite counter electrode, and a saturated Ag/AgCl reference electrode.
I really appreciate your opinions and suggestions!
Hi All, I am using MgO crucibles to sinter Li-containing ceramics to ~1200C. I wanted to clean up the crucibles used but cannot find a good protocol yet. I'm using sandpaper to wipe the ceramic remains off and clean the inside with ethanol. But I'm not sure it will be enough. Could anybody share some experiences? Thank you!
I want to bond carbon nanofibers and any other ceramic nanofibers, for example, silica nanofibers. How can I do it? Is there any straightforward method to do it?
any suggestions and references would be really helpful.
I'm working on multi-atomic inorganic compounds. So, visualization of atoms in a particular plane becomes difficult. As a result, it is difficult to calculate plannar density (PD) manually. So, please suggest me a way/software to calculate PD easily.
Thanks in advance.
I have found an unexpected metal-looking deposit on my (originally white) ceramic cups.
- I am wondering if anyone has experienced a similar phenomena during pyrolysis of organic residues?
- And what type of metal could theoretically behave this way?
The pyrolysis was operated at 800 deg C, and a residence time of 120 min. The substrate was sludge coming from a municipal wastewater treatment plants.
My current hypothesis: is that the deposited material is coming from the substrate. The known metals in the substrate are mainly Zn and Cu, of which I estimated that I had about 20 mg in the substrate before pyrolysis (possibly Al is also present but I did not measure). Based on the mass of Zn available am guessing it could be a Zn coating, but could I really expect Zn to behave this way ("evaporating" and depositing at 800 deg C)? I have been in contact with others who performed pyrolysis of similar substrate but they did not experience this type of metal-like deposit. The other explanation is that the metal-like deposit is actually somehow coming from my instrumentation, but it seems unlikely at present.
I am using PVD machine for gold plating on ceramic products. there are 20 sources of titanium, reactive gas N2 and Ar,
I am having trouble when vacuuming 2.0x10-2Pa , adding Ar and N2 gas and bombarding the titanium source, the vacuum is lost and cannot be coated (7.0x10-1 ~ 9.0x10-1) the more sources titanium open, the more vacuum is lost
I want to know that how we can check that dry particle size (0.8mm) is homogeneously mixed or not? How can we assess the homogeneity of dry particle size mixture. Lets say we have a mixture of SiC and ceramic stucco. The size of both 0.8mm range.
I am looking for a bicrystal fabrication company.
My major is focusing on the exploration of grain boundary structure.
And thus for a model experiment I need metal*or ceramic** bicrystals.
Could you let me know about possible companies which grow bicrystals for my research.
I would appreciate your reply.
*Cu, Ni, Au, etc
**SrTiO3, BaTiO3, sapphire (Al2O3), etc.
Has anyone faced the problem of intensive arcing during plasma etching of ceramic substrate in PVD technology? What is a proper way to prepare ceramic/cermet surface before coating to reduce arcing?
Hope you are doing well!
What are the best books in Materials Science and Engineering (Basics and Advanced)? Moreover, what are the best skills (or materials topic related) that materials scientists have to develop and to acquire?
Thanks in advance
what happened if we tried to re-sintering of produced powder (by means of grinding)that obtained from previously sintered ceramic compact based on zirconia ? is it accepted in ceramic community? i understood that in the previous sintering, there was necking and grain growth. so if we re-sintered the powder produced from it, i think that it will undergo to further grain growth and may affect the properties of zirconia through changing the existed tetragonal phase. is this true?
Please note it's not a waste incineration but a postcombustion treatment of vapours of a ceramic kiln
I am searching for an electrically conductive adhesive for making good contact with ceramic pallet and copper wire.
Silver paint or silver paste doesn't have sufficient adhesive nature .
Can anyone please suggest such an adhesive which serves in cryogenic temperature?
Thanks and Regards
A question is if in a "normal soil" - never flooded the water pressure at zero or below.
May the soil water flows into the ceramic cup of a tensiometer?
I guess it is not possible because I do have always a hydraulic head inside the ceramic cup (if its filled of water).
Moreover, also in a situation where, momentaneously, water pressure is lower inside the ceramic cup (e.g after a strong rain in a dry period) than outside, it the pressure will be equilibrated quickly (i.e time response of tensiometer), and the hydraulic conductivity of the ceramic is too reduced to allow some identifiable flow.
Anyway - Maybe Im biased. If you do have any theoretical or practical ideas.
Please let me know.
I have jaw milled an aluminosilicate glass and omitted ferrite impurities via HCl. After ball milling with either metal cup and balls or stabilized zirconia balls with ABS cup, there are lots of impurities that I can not omit completely. I have tried both ball milling and wet milling and neither of them worked. Is there any other way to mill the glass powder to under 1 micrometer without this much of impurities?
I'd like to observe a phase transformation on dilatometer curves for loose powders.
I am looking for a ceramic tile grinder that will give me a particle size of less than 600um for research purposes.
Thanks in advace
I don't have clean room and dust equipment in vacuum environment facility. So after doing precision grinding of my RB-SiC ceramic, it gets exposed to the cold atmospheric plasma process via oxygen (O2) fluid flow on the micro-grinding of RB-SiC ceramic at room temperature.
The hard-brittle layer be formed while and holding it to the substrate holder and fixture. And due to this, surface modification layer again forms which are supported as a effective improve the RB-SiC ceramic removal rate with hardness layer under the surface modification process produce C layer, SiO2 layer or Si-C-O compound through physicochemical reaction via oxygen at room temperature (To my knowledge).
How to further removal efficiency the hard-brittle layer?
Please suggest me something. Thanks.
Thank you for sharing and helping,
Jiabin Xu (Jia-bin Xu)
Harbin Institute of Technology (HIT)
School of Mechatronics Engineering
Timestamp/ Time Line: 2022-04-07, Thursday, Night
Can anyone tell me how many power/area could I collect with a ceramic piezoelectric disc? Or where can I find it? I tried to seach it but I didn't find it. I need a paper or document with that information
I am working on ceramic resins. I First mixed the ceramic with surfactant and a solvent. Ballmilled for 1 hours. To facilitate chemisoprtion i kept the solution in oven for 130 degree for 180 minutes. I found the white ceramic powder the turned brown in colour. I would like to know the reason for the outcome.
i am researching into moringa seeds an locally made ceramic filter and optical density must be performed to see efficacy of the filter and moringa.
For glueing ceramic.
I run apparatus with vacuum in roughly the 10^-7 mbarr range, and we would usually use araldite epoxy, as it has low vapour pressure and seems to work down to 10^-8 mbarr. It has a max temperature of 65 degrees, and the piece I need to use it on may get hotter than that. Any suggestions for a glue or epoxy with a higher max temperature that you have used in vacuum?
I am trying to analyze SPS sintering data for ceramics. We sintered this sample at two different temperatures and two different pressure, each apart by 20ish. For example, we started with 1000C and 30mpa withholding of an hour, then increased to 1200C and 50mpa withholding of 25 minutes.
When we try graphing the displacement vs. temperature graph, we expected a positive stair-looking graph as we are calculating the displacement by subtracting the ram position from the starting ram position.
We do get a similar graph. However, we see a decrease in the displacement right when the temperature starts to increase after the hold at 1000. We looked at other values like the ram force and current, where we realized that all values that were increasing dropped sharply as soon as the temperature starts increasing after the hold. Does anyone know why this happens?
Hi¡ We are working with Lithium Cobalt Oxide ceramics, and I would like to know the sintering temperatures of these kind of materials. We are starting with 900 ºC, but any ideas about lowering or increasing this temperature are welcome¡ Thanks¡
We want to measure real-time complex dielectric properties of LTCC ceramic pellets at temperatures above 500 degree Celsius. Is it possible to measure the complex dielectric permittivitty of ceramic pellets at elevated temperature above 500 degree Celsius using an LCR meter?
Hello everyone. I usually use vycor frit fitted Ag/AgCl reference electrode for all my electrochemical experiments. Now I would like to try ceramic frit instead of vycor glass frit, because of it's availability and cost effectiveness. But I am not sure about it's usability, stability and performance under severe electrochemical conditions like very high/low pH, or high/low potential, etc. Could anyone please suggest anything on advantage/disadvantages of using ceramic frit instead of vycor glass frit? Thank you in advance.
Hello, I am doing research in ceramic 3D printing using stereolithography (SLA) method. I was wondering if there is any feature of photopolymer resin that make it not able or not safe to go through firing /sintering process. Thanks!
I am investigating the corrosion properties of SS having Ceramic thin layer over it, however it shows different ocp value and tafel curve, when tested the same samples at different location keeping all the parameters constant.
how it can be overcome, so that repeatability can be maintained to the best.
In the available literature, a lot of Low frequency dielectric response data is being published on ferrite ceramics over the frequency range from 0.1Hz to 1MHz. Low frequency dielectric response is useful for which particular device applications?
I've recently read many articles about fiber reinforced UHPC use in balistics. About 70-80 % of them say that adding fibers to UHPC increases ductility, but I think that this is not accurate because these materials don't behave in a way ductile materials like steel or termoplastics behave. They instead behave more like thermosetting plastics or ceramics. Wouldn't calling it tough be more accurate?
I've been searching for days in databases to find the correlation between porosity in materials (for built environments like porcelain, ceramics, wood, etc.) and biofilm formation (index of bioburden). The findings will help me then understand the correlation between porous/non-porous materials and their cleanability properties.
I am working on improving the twin wire arc spraying process. specifications of my available thermal sprayer:
Current Capacity: 200amps
wire diameter : 1.2 mm Aluminum 1xxx
Power : 8Kw Max
It seems that increasing the pressure is one of the parameters to improve the metal coating on ceramic substrate in the twin wire arc spraying method. I am looking to increase the air atomization pressure for more than 6 bar but it does not go more than 5 bar. Although the air back pressure of the arc spray machine is 8 bar before turning on the device.
Can you guide me?
This material, I would like to use in the sintering process of ceramics. plz suggest me the solution.
I am looking for sources which provide pH of ceramic Compounds; for oxides, nitrides, carbides and... . for example: TiN, TiC, SiC, ZrN, TiF3, ZrO2, Si3N4 and...
Does any one know about it?
please help me
I am working on binder for ceramic slip. I have commercial ball milled slip with added sodium lignosulfonate and STPP having pH=10, I am adding just a drop of 10% PVA (MW: 1,25,000, degree of hydrolysis 88%) solution in 100 g slip , my slip becomes too viscous and finally turns in non stir-able consistency. Any sugessions? As PVA is reported as binder in many literatures.
Hi. We would like to evaluate different ceramics for use as crucibles for holding molten metal - mostly cast irons and steels. The ceramic crucibles will undergo wear during service, due to the movement of the molten metal against the crucible walls due to induction mixing, and also there will be ceramic-on-ceramic wear in the molten metal environment.
Are there any standardized wear tests (ASTM, ISO...) that we could use?
Could you provide a selection principle of resin species in order to increase cured depth for DLP ceramic slurrry? For example, the ratio of HDDA and PEGDA or any other resins.
Assuming that bulk production of ceramic fibers is not a problem. What could possibly be the benefits of the replacement?
The total slurry contained 50 wt% Alumina (D50 = 0.5 um, 11 m2/g surface area), 50 wt% DI water. Powder was dispersed using NH4PMA aqueous solution. PVA aqueous solution was used as binder (20 wt% active matter w.r.t Al2O3), PEG-300 was used as plasticizer (20 wt% w.r.t Al2O3, 1:1 binder to plasticizer ratio). After mixing and debubbling, the slurry seemed good, and a good tape (~450 um thickness) without cracks was obtained after tape casting.
Debinding of single tape (40 mm x 40 mm x 450 um) at 1 C/min, 600 C, 2 h holding gave debinded tape without cracks, which could be sintered too without cracks.
I did lamination of 9 tapes via thermocompression using uniaxial warm-press. The temp. used was 80 C, and 15 MPa was the maximum pressure that could be applied.
I also tried with increasing number of tapes up to 15, and for those i used temp of 100 C so that a higher pressure could be applied, and the max. pressure that could be applied was 40 MPa, with change in dimesnions of the pressed tapes. I even tried only two layers pressed at 100 C, 40 MPa.
But: Every time debinding of laminated samples resulted in cracks. I tried with 1 C/min, 0.5 C/min, and 0.3 C/min heating rates up to 600 C. I also tried with giving steps, for example using 0.3 C/min heating rate and holding at 100 C for 2 h, at 300 C for 6 h, at 500 C for 4 h. But the samples always cracked. Please find attached the TG/DTA data of a single tape.
Please guide me how to achieve debinding without cracks. I'll appreciate your kind help.
- I am fabricating ceramic-polymer composite by solvent mixing method.
- During synthesis process ultra-sonication (bath Sonicator) treatment is given to ceramic filled polymer (mixed solution) for homogeneous dispersion of ceramic in polymer matrix.
- As per the literature the dispersion quality is checked by AFM, SEM, or TEM after the fabrication of material. Also I found that zeta potential also gives the dispersion quality, but 'zetacizer' or 'zeta potential analyzer' equipment's are much more expensive.
- Is there any other feasible method is available, which helps to check the dispersion quality during synthesis process? So that we can give the right and proper time, for sonication treatment.
I need to validate the safety of use of dental materials.
I have been able to access Safety data sheets but require scientific validation of their biocompatibilty
Manufacturer and supplier websites do not seem to provde these as readily accessible downloads
Any indormation is greatly appreciated
X-ray diffraction peaks of my ceramic powder in low angle (2 theta= 3 - 70) start at high intensity. I tried a different slit on the incident light side, but it was the same. I really appreciate it if you can suggest to me any solution about that. You'll find the attachment below.
Cast iron is metal, not ceramic. But it is brittle, and quite strong. What can be additives that can be added to increase its strength, corrosion resistance and high temperature stability so that it can be used in place of hard ceramics in structural application? on can it not be qualified as a ceramic even if its microstructure is predominantly intermetallic?
I want to fuse solid Sodium Hydroxide with a solid aluminosilicate in a muffle furnace at 550 degrees Celsius for 1.5 hours. However, the Al2O3 crucibles I tried the fusion on often crack, even when the furnace is opened at around 200 degrees celcius. I have learned that NaOH reacts with many ceramics and metals. Also, I have to fuse large quantities of material in a very short space of time and having to wait for the furnace to cool down naturally without opening the door will slow the process down significantly. Can anybody recommend a material I can use for the crucibles which does not react with NaOH and has high resistance to thermal shock?
I am assigning my XPS peak and associated binging energies to the the potential compound. In HR O1s spectra, I have a satellite peak at 535.35 eV. My sample is a bulk ceramic coating (TiAlN) and I didn't find any Ti/Al oxide peak close to this binding energy. Does anyone know what could this be?
I do not know the dynamic viscosity of my material (ZrB2-SiC). It's ceramic.
Is there any way to calculate it numerically?
If you know about it, please comment. Thank You.
Hello every one. I am synthesizing ceramic microfiltration supports with kaolin clay. After mixing kaolin clay (pure kaolin clay with some trace metals) and water, the mixture is put in a mold and the pressure is applied. It dries a day in room temperature and then calcinated up to 1000 C, but after calcination they are not strong enough and break easily. Could anyone help me?
I am working on piezo material (PZT) and facing the problem of stoichiometry control due to lead loss during solid-state synthesis. how do minimize it?
I am working on the evaluation of Structural, Mechanical & Optical properties of Zirconia-based dental ceramics to use as dental implants/crowns in the field of dentistry. As we know, Tetragonal Zirconia ceramics is the best candidate due to its very good Structural & Mechanical properties (e.g., Flexural/Bending strength, Fracture toughness, Modulus & Hardness); however, it has very limited/low translucency. A good translucency is required for aesthetic purposes.
As I am working on improving translucency of the Tetragonal Zirconia Ceramic, I want to know, how much (on an average) translucency (Please tell in terms of "% Transmittance" value) is required to satisfy aesthetic requirement (To match appearance with other existing tooths) such that use of any veneering material (for e.g., Porcelain) is avoided. Please share a reference, if possible.
How can I reduce the temperature of calcinaton the Perofskit ceramic PZT dope in site cationic (Sr) and site Anionic (F) preparation when temperature of calnation is very high
I came across an article that uses heat treatments to determine whether or not the surface charge introduced by contact electrification on a ceramic material is due to electron-transfer mechanism or ion-transfer mechanism. I was wondering if ions can be removed using heat or what other method can be used.
Dear fellow researchers,
are you aware of open-source or commercially available software to estimate the failure probability of ceramics and generally of brittle materials, once given the state of stress and strain from a FEM solver? I'm dealing with ANSYS, but so far could not find a valid answer inside its users' community. Several plug-in post-processing tools are available for high-cycle and (a bit less) for low-cycle fatigue of metal materials. I also found clever stuff for creep on polymers. Very little on ceramics.
I would love if any of you could help me with some references. Thanks a lot in advance.
why sponge-like ceramic membranes are more efficient in dissipating the stresses compared to finger-like membranes?
I am currently doing applied research to develop a recoating mechanism similar to that used in DMLS (Direct Metal Laser Sintering) processes. I am searching for the best abrasion resistant material that can withstand being exposed to Ti-6Al-4V powder.
Any insight would be appreciated!
Hello all , Thanks in advance for reading my questions.
I purchased 3d printed filaments from these people https://worldoflilliputs.com/product/10-meter-ceramic-trial-pack/
the name they given for material is ceramic ( i am doing research in bioimplants i thought to use it ) but it is polymer. I started searching for literature nothing found , ceramic original composition , orginal 3d printing are poping up instead of this polymer. what sort of keywords need to be used to search for it . I enquired with the suppliers regarding combination of filament , they didnt responded. so I went on to EDX analysis , (I attach those as well) I couldnt able to understand how to think about the materail please do help .
Normally, metals have a higher coefficient of thermal expansion (CTE) than ceramics. I would like to know how the higher CTE of hydroxyapatite than titanium would be explained?
CTE (hydroxyapatite)≈ 14.6×10-6 °C-1
CTE (Ti64)≈ 8.6×10-6 °C-1
In the case of fuel fired or electrically heated furnaces, a metallic muffle may be used to ensure a constant temperature zone within the heated chamber. The metal evens out temperature gradients. How can a constant temperature zone be obtained in a microwave oven for the sintering of ceramic bodies?
We have coated certain ceramic thin films on stainless steel as potential corrosion-resistant coatings. The corrosion test will be performed in 98% sulfuric acid at elevated temperatures. But I have coated my substrate on one side. However opposite side is uncoated. As the whole sample will be dipped inside the sulfuric acid solution, the backside (stainless steel) will be also exposed to Sulfuric acid. So, what type of material I should use to protect the backside of my sample from the harsh acid environment which will not compromise the validity of the corrosion rate. Will epoxy or magic work?
Currently, we are using alumina crucibles (%99.7 purity / alsint) to melt silicate glass samples.
We can not remove the remaining glass from crucible with physical approach.
I would like to know, is it possible to clear the crucible with any chemical substance
or how can I remove residual glass from alumina crucible after casting?
I am presently proposing to work on cementation of ceramic veneers on discoloured teeth with 2 types of resin cements having the same shade. My question are 1) what sort of shade of choice 2 light cure and nx3 nexus resin cements will be able to mask the underlying tooth color if the emax veneer is not more than 0.5mm in thickness.