Thermal Conductivity Of Silicon Nitride Ceramics

Silicon nitride si3n4 with high thermal conductivity has emerged as one of the most promising substrate materials for the next generation power devices.

Thermal conductivity of silicon nitride ceramics.

It is a high performance technical ceramic that is extremely hard and has exceptional thermal shock and impact resistance. Hence si 3 n 4 is the most commercially important of the silicon nitrides when referring to the term silicon nitride. Due to the reduction of lattice oxygen content the srbsn ceramics could. The values of the thermal conductivity for the snn10 snn15 snn20 substrates were about 85 90 w mk at 323 k and they decreased at elevated temperature reaching about 70 75 w mk at 473 k.

Dense silicon nitride si 3 n 4 ceramics were prepared using y 2 o 3 and mgf 2 as sintering aids by spark plasma sintering sps at 1650 c for 5 min and post sintering annealing at 1900 c for 4 h. Silicon nitride si 3 n 4 ceramic properties. It is a white high melting point solid that is relatively chemically inert being attacked by dilute hf and hot h. The theoretical thermal conductivity of silicon nitride crystals is 200 320 w m k.

Effects of mgf 2 contents on densification phase transformation microstructure mechanical properties and thermal conductivity of the si 3 n 4 ceramics before and after heat treatment were. Si 3 n 4 is the most thermodynamically stable of the silicon nitrides. Silicon nitride has the most versatile combination of mechanical thermal and electrical properties of any technical ceramic material. Parts are pressed and sintered by well developed methods to produce a ceramic with a unique set of outstanding properties.

Silicon nitride si 3 n 4 with high thermal conductivity has emerged as one of the most promising substrate materials for the next generation power devices this paper gives an overview on recent developments in preparing high thermal conductivity si 3 n 4 by a sintering of reaction bonded silicon nitride srbsn method. Silicon nitride is a man made compound synthesized through several different chemical reaction methods. Silicon nitride is a chemical compound of the elements silicon and nitrogen. Because of the strong covalent nature of si n bond si 3 n 4 ceramics possess a lot of attractive properties such as high strength at room and elevated temperatures high hardness good resistance to corrosion thermal shock and oxidation and so on besides si 3 n 4 ceramics have gained a staunch reputation of high thermal conductivity since haggerty and lightfoot.