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When measuring the temperature of high-temperature fuel, gas, and coal systems, as well as various high-temperature kilns, heat treatment high-temperature salt bath furnaces, and various metal smelting furnaces, we encounter strong corrosion of the protective tube by high temperatures and oxygen, sulfur, tar, and oxygen ions. In addition to withstanding high-temperature physical damage, it must also withstand chemical damage. In such harsh environments of high temperature and high corrosion, pressureless sintered silicon carbide ceramic protective tubes are usually used.

Various chemical processes and metal smelting processes require real-time temperature measurement of the process, especially for various liquid temperatures. Silicon carbide material has excellent oxidation resistance, corrosion resistance, excellent thermal shock resistance, and good thermal conductivity. It is an excellent material for making thermocouple protective tubes and can be used in hydrochloric acid, nitric acid, sulfuric acid, and Zn, Sn, Pb metals for extended periods.

Physical Properties of Pressureless Sintered Silicon Carbide Ceramic Products

Physical Properties		UNIT	Pressureless Sintered Silicon Carbide
Composition: SiC		vol%	≥98
Density 20°℃		g/cm³	≥3.10
Open Porosity		Vol%	＜3.0
Hardness	Rockwell Hardness 45N	R45N	93
	Vickers Hardness HVI	kg/mm²	2350
Flexural Strength 20℃		MPa	320–400
Flexural Strength1300℃		MPa	300–400
Cofficient of Themal Expansion		10⁻⁶K⁻¹	4
Themal Conductivity 20℃		Wm⁻¹K⁻¹	116
Thermal Conducivity 1200℃		Wm⁻¹K⁻¹	35
Modulus of Elasticity @ RT		GPa	410
Thermal shock resistance		℃	＞350
Mar. Service Temp (air)		℃	approx.1650