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In the metal materials sintering, melting, heat treatment, and glass industries, indirect gas heating is an important method. Compared with direct combustion heating, indirect gas heating can significantly improve thermal efficiency and reduce the emission of harmful gases such as NOx. At the same time, it improves temperature stability and ensures control of the furnace atmosphere; in many industrial heating processes, it is required that the workpiece be isolated from the combustion environment. This requires the use of indirect radiant heating.

Traditional indirect heating mainly uses metals or their alloys as the radiant heating tubes of the heating system, but so far, the upper limit of the operating temperature of most metal radiant tubes is only 1000℃, which cannot meet the higher heating temperature requirements of many processes. The main problem currently existing is the reliability of long-term use at higher temperatures and in more complex media. Pressureless sintered SiC radiant tubes can be used stably for a long time at high temperatures of 1650℃ and in various corrosive media.

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