硅碳棒

物理性能

Physical

元件质地硬而脆，耐急冷急热，高温下不易变形，其它物理性能如下表：

The elements are brittle with high cold-resistance and heat-resistance.It's uneasy to be out kf shape.Its other physical properties are as follows:

化学性质

Chemical property

硅碳棒有良好的化学稳定性，抗酸能力强。在高温条件下碱性物质对其有侵蚀作用。

元件在1000℃以上长期使用能与氧气和水蒸气发生如下作用：

①Sic+2O₂→Sio₂+CO₂

②Sic+4H₂O＝Sio₂+4H₂+CO₂

致使元件中Sic₂含量逐渐增多，电阻随之缓慢增加，为之老化。如水蒸气过多，会促进Sic氧化，由②式反应产生的H₂与空气中的O2给合成H2O再反应产生恶性循环。降低元件寿命。

氢气(H₂)能使元件机械强度降低。氮气(N₂)在1200℃以下能防止Sic氧化1350℃以上与SC发生反应，使Sic分解氯气(Cl₂)能使Sic完全分解。

It has good chemical stability and corrosion resistance.At high temmperature,alkalin

e material has an etxhing effect on it.If rhe elements are used attemperature above 1000 C for a long time it will react with oxide and wapour as following;

①Sic+2O₂→Sio₂+CO₂

②Sic+4H₂O＝Sio₂+4H₂+CO₂

It will lead to increase of Sio₂ contents.Electrical restance will also raise slowly and become ageing.If the vapour is too much,the oxidation of sic will bepromotrd.H₂produced by②reactionbonds with O₂in the air to form H₂Owhic react with sic again,thus causing wicious circle which reduces the life of elements.

Hydrogen(H₂)can reduce the mechanical strength of elements,while netrogen(N₂) can prevent sic from oxidizing at temperature under 1200 C,above11350 C,nitrogen reacts with sic and decompose it.Chlorine(Cl₂)can decompose sic completely.