Nitride ceramics have refractory compounds of nitrogen and metal or non-metal elements covalently bonded as the main component. The most widely used ceramics include silicon nitride (Si3N4), aluminum nitride (AlN), boron nitride (BN), and other ceramics. Among them, due to their excellent hardness, mechanical strength and heat dissipation, silicon nitride ceramics, and aluminum nitride ceramics can be made into ceramic substrates for electronic packaging, which have good development prospects. In the preparation process of aluminum nitride and silicon nitride ceramic substrates, boron nitride ceramics play an important role.
Cubic boron nitride and hexagonal boron nitride are relatively common crystal forms. Cubic boron nitride has a structure similar to diamond, is extremely hard, and is widely used in industrial drilling and grinding tools. Hexagonal boron nitride (hexagonal boron nitride) is a white powder and an advanced ceramic material. Its crystal structure is very similar to that of graphite, and the physical and chemical properties of the two are also identical. Therefore, hexagonal boron nitride is also called “white graphite” and is the most commonly used form of boron nitride.
Characteristics of hexagonal boron nitride:
-The expansion coefficient is equivalent to quartz, but the thermal conductivity is ten times that of quartz, which is the same as stainless steel. The high thermal conductivity of hot-pressed products is 33W/mK, and the thermal shock resistance is excellent;
-In terms of mechanical properties, it has the advantages of non-abrasiveness, good lubricity, and easy processing;
-In terms of electrical properties, it has the advantages of good dielectric strength, low dielectric constant, low loss at high frequency, microwave penetration, and good electrical insulation;
-In terms of thermal properties, it has the advantages of high thermal conductivity, high heat capacity, low thermal expansion, thermal shock resistance, high-temperature lubricity and high-temperature safety;
-In terms of chemical properties, it has the advantages of chemical stability, corrosion resistance, oxidation resistance, low wetting, biological stability, and non-stick properties.
Sintering crucible for silicon nitride/aluminum nitride substrate
A boron nitride crucible can be used for sintering silicon nitride substrate/structural parts, aluminum nitride substrate/structural parts, etc. The maximum operating temperature is 2100℃ (in inert atmosphere). It has the characteristics of high and low-temperature repeated impact resistance, corrosion resistance, no reaction with metal and ceramic materials, no adhesion, long service life, etc. It can replace graphite and alumina crucibles.
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