You Zhou, Yuki Nakashima, Kiyoshi Hirao, Manabu Fukushima
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Effects of packing powder on densification and properties of pressureless sintered silicon nitride ceramics
Pressureless sintering of Si3N4 doped with 2 mol% Y2O3 and 5 mol% MgO was carried out at temperatures ranging from 1700°C to 1770°C in three kinds of packing powders consisting of Si3N4 and BN coupled with or without addition of Y2O3, MgO, and SiO2. Effects of packing powders on weight change, densification, and grain growth during sintering and properties (thermal conductivity, fracture toughness, and bending strength) of the sintered samples were studied. It was found that adding Y2O3 and MgO into the packing powder resulted in improvement of densification, grain growth, thermal conductivity, fracture toughness, and bending strength of the sintered samples. However, further addition of SiO2 into the packing powder could lead to suppressed grain growth and decrease in thermal conductivity, fracture toughness, and bending strength. The sample sintered at 1770°C in the packing powder containing Y2O3 and MgO was fully densified, and it possessed well-balanced properties: thermal conductivity of 76 W m−1 K−1, fracture toughness of 7.82 MPa m1/2, and bending strength of 932 MPa.
期刊介绍：
The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas:
Nanotechnology applications;
Ceramic Armor;
Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors);
Ceramic Matrix Composites;
Functional Materials;
Thermal and Environmental Barrier Coatings;
Bioceramic Applications;
Green Manufacturing;
Ceramic Processing;
Glass Technology;
Fiber optics;
Ceramics in Environmental Applications;
Ceramics in Electronic, Photonic and Magnetic Applications;
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