Material selection for heat exchangers

Silicon carbide (SiC) is produced by high-temperature smelting in a resistance furnace using raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (salt is added when producing green silicon carbide). Silicon carbide also gives rise to a rare mineral found in nature, moissanite. Silicon carbide is also known as carborundum. Silicon carbide is a hexagonal crystal with a specific gravity of 3.20–3.25 and a microhardness of 2840–3320 kg/mm2; it features high hardness and low weight. Silicon carbide has stable chemical properties, a high thermal conductivity, a low coefficient of thermal expansion. Devices made from it are lightweight yet strong, and they offer good energy-saving effects. Silicon carbide is conductive and does not accumulate static electricity. Its thermal conductivity is 2 times that of graphite, 4 times that of stainless steel, 5–6 times that of zirconium titanium, and 700 times that of PTFE

It might be due to some rather special operating conditions

The thermal conductivity of silicon carbide is almost comparable to that of graphite tubes commonly used, and it is much higher than that of other materials. Its thermal conductivity is twice that of tantalum, five times that of stainless steel, 10 times that of Hastelloy, and 15 times that of glass-lined steel. Its excellent thermal conductivity enables silicon carbide heat exchangers to be efficient and energy-saving, while **reducing the required heat exchange area.

It cannot be used; consider an F4 heat exchanger

With an F4 heat exchanger, hydrogen fluoride will corrode the silicon carbide tubes

High-purity silicon carbide heat exchangers are currently the most suitable for hydrogen fluoride applications, and our heat exchangers have already been put into use. If you want to know more, you can add QQ4630138

High-purity silicon carbide heat exchangers are currently the most suitable for hydrogen fluoride processing conditions. Through research and testing, we have found that high-purity silicon carbide heat exchangers offer excellent performance in terms of heat exchange efficiency. If you want to know more, you can add QQ1282154988

What are the operating conditions or range for silicon carbide heat exchangers?

Thermal conductivity: 140. Sintered under pressure-free conditions. Resistant to acid corrosion at 100 degrees Celsius; corrosion rate is 1.8. Resistant to 53% HF at 100 degrees Celsius; corrosion rate is less than 0.2. Resistant to 25% HCl at 70 degrees Celsius; corrosion rate is less than 0.2