Milad Sakkaki

University of Tabriz · Department of Manufacturing

The temperature of a cutting tool during machining process has a direct effect on its lifespan. Manufacturing the tool from materials with high thermal conductivities or cooling the tool during the machining is common ways to avoid the cutting tool overheating. The thermal resistance between assembled parts of a cutting tool is a very important fac...

In the present work, paraffin phase change material is used as quenchant for the heat treatment of 42CrMo4 alloy and compared with water, air, and CuO doped paraffin. The samples were prepared based on ASTM E 8M-98 standard for tensile test and then heated up to 830 °C, kept for 4 hours in an electric resistance furnace and then quenched in the men...

Temperature and electric current distributions in the spark plasma sintering process of a ZrB2 sample were simulated using finite element method. The main source of heating in spark plasma sintering is perceived as the Joule heating effect, which is a result of electric current distribution in the setup. Two sets of governing equations including th...

Spark plasma sintering (SPS) is an efficient manufacturing method especially for ultra-high temperature ceramics (UHTCs) such as titanium carbides. Heating mechanism in SPS is a result of high electric current in the device including die, punch, and sample powder. Because the temperature distribution in the sintering process has considerable effect...

In the present work, paraffin phase change material is used as quenchant for the heat treatment of 42CrMo4 alloy and compared with water, air, and CuO doped paraffin. The samples were prepared based on ASTM E 8M-98 standard for tensile test and then heated up to 830 °C, kept for 4 h in an electric resistance furnace and then quenched in the mention...

In this research, TiB2-based ceramic was made by compacting the powder with g-C3N4 additive using spark plasma sintering (SPS) method. To manufacture the sample, first, a mixed suspension of g-C3N4 and TiB2 powders with a mass ratio of 1–10 was prepared in 96% ethanol. Then, the particles of the secondary phase were properly distributed in the main...

This work conducts a numerical simulation to investigate the temperature and electric current distribution during the spark plasma sintering (SPS) process using the finite element method (FEM) carried out in COMSOL Multiphysics software. The main goal is to optimize the SPS process for titanium carbide (TiC) ceramics, with a particular focus on the...

This study provides a detailed analysis of the Spark Plasma Sintering (SPS) process for Zirconium Diboride (ZrB2) ceramics, utilizing the finite element method in COMSOL Multiphysics. The focus is on understanding the temperature distribution during the SPS of a ZrB2 sample in a graphite die. Heat diffusion equations, augmented with Joule heating c...

In this study, in situ composite was manufactured by using TiB2 matrix and C3N4 additive through spark plasma sintering. The optimum SPS parameters were considered and the process was carried out at a temperature of 1900°C for 7 minutes by applying an external pressure of 40 MPa. The thermodynamics of possible reactions during the process were inve...

The g-C3N4 which is well known as a polymeric non-metal semiconductor, has been fabricated by thermal polymerization. It has also been used in catalytic applications including, photo-catalysis, removal and degradation of pollutants in water, Friedel-Crafts reactions, oxygen reduction reaction and etc. It has drawn noticeable research attention due...

اولین قدم در مهندسی مواد و ساخت و تولید ، استخراج و مطالعه خواص مکانیکی مواد می‌باشد. ساخت و آماده سازی نمونه استاندارد برای استفاده در آزمون‌های مکانیکی، به خاطر محدودیت در دسترسی به ماده و یا محدودیت در زمان به دلیل پیچیدگی ساخت نمونه همیشه ممکن نیست. در بین آزمون‌های مکانیکی، آزمون پانچ برشی (SPT) به دلیل نیاز به مقدار کم ماده و سادگی در آماده س...

Spark plasma sintering is an interesting manufacturing method, which benefits electric current heating. In the present study, the sintering process of hafnium diboride (HfB2) ceramics was simulated using the finite element method. The governing equations of electric potential, current conservation, and energy conservation were solved using COMSOL M...

The present work aims to investigate the geometrical parameters of the graphite die on energy consumption needed for sintering of a ZrB2 sample. The Maxwell and electrical charge conservation equations are solved to obtain the electrical potential and current of the system. The governing equations are discretized by the Galerkin method and solved u...

In this research, convective heat transfer in a flow over rotating elliptic cylinders with various axis ratios and rotation rates is investigated numerically. The governing equations including continuity, momentum and energy equations are solved by numerical finite element method. The rotating cylinder was assumed at a constant temperature and heat...

The failure of the differential threads or nut in the truck's differential due to high pressure to the nut or differential threads in road bend or heavy loads, loosening of the nut due to frequent opening and closing or fatigue phenomenon in threaded teeth's is the big problem for teamsters and trucks. When the differential thread fails, the differ...