Silicon carbide reaction sintering furnace

Reaction sintered silicon carbide ceramics are also called self-bonded silicon carbide ceramics. Typical products are the commercial materials REFEL and KT and silicon impregnated sintered silicon carbide. The plastic blank is generally made of silicon carbide powder (~ 5μm), carbon or graphite and plasticizer. It can also be obtained by mixing silicon carbide powder with plastic sintering agent. The billet is pressed, extruded, grouted or other forming methods to make the billet.

Plasticizer burns or pyrolyzes into porous carbon, and liquid or gaseous silicon reacts with amorphous carbon or graphite to form SiC. The SiC polycrystals formed by the reaction are integrated with SiC powder, and excess silicon [~ 10% (vol)] fills the micropores to obtain products without pores. The bending strength at 25 degrees can reach 400-600MPa, the melting point (1410 degrees) strength is 250MPa, and the elastic modulus is about 115MPa.

It can be used as coating material for nuclear fuel, various mechanical sealing parts, high-temperature gas turbine components (mainly combustion chamber), etc. with ideal results. In 1975, w.B. Hilling and others developed SiC / Si composite ceramics. Polysilicon carbide is obtained by reacting carbon fibers (in the form of cloth felt or chopped fibers) with molten silicon. The advantage of this method is that the finished product still maintains the original orientation of the carbon fiber, and the mechanical properties are similar to those obtained by other processes.

Silicon carbide reaction sintering furnace technical parameters：