1, high heat resistance: 3000ºC sublimation, its strength 1800ºC is 2 times of room temperature, 1500ºC air cooling to room temperature dozens of times do not break, in the inert gas 2800ºC does not soften.
2, high thermal conductivity: hot pressed products for 33W/M.K and pure iron, above 530ºC is a large thermal conductivity of ceramic materials.
3, low thermal expansion coefficient: 2×10-6 expansion coefficient is second only to quartz glass, is the smaller ceramic, plus its high thermal conductivity, so the thermal shock resistance is very good.
4, excellent electrical performance: good high temperature insulation, 25ºC for 1014Ω-cm,2000ºC can also reach 103Ω-cm, is a good high temperature insulation materials in ceramics, breakdown voltage 3KV/MV, low dielectric loss 108HZ is 2.5×10-4, dielectric constant is 4, microwave and infrared penetration.
5, good corrosion resistance: with general metal (iron, copper, aluminum, lead, etc.), rare earth metals, precious metals, semiconductor materials (germanium, silicon, potassium arsenide), glass, molten salt (crystal, fluoride, slag), inorganic acid, alkali do not react.
6, low friction coefficient: U is 0.16, does not increase at high temperature, than molybdenum disulfide, graphite high temperature resistance, oxidation atmosphere available to 900ºC, vacuum available to 2000ºC.
7, high purity: its impurity content is less than 10PPM, and containing B is more than 43.6%.
8. Machinability: its hardness is Mohs 2, so it can be processed into parts with high precision by general machining methods.
1, high heat resistance: 3000ºC sublimation, its strength 1800ºC is 2 times of room temperature, 1500ºC air cooling to room temperature dozens of times do not break, in the inert gas 2800ºC does not soften.
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