物理性能
Physical
元件質(zhì)地硬而脆，耐急冷急熱，高溫下不易變形，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:
化學(xué)性質(zhì)
Chemical property
硅碳棒有良好的化學(xué)穩(wěn)定性，抗酸能力強(qiáng)。在高溫條件下堿性物質(zhì)對(duì)其有侵蝕作用。
元件在1000℃以上長(zhǎng)期使用能與氧氣和水蒸氣發(fā)生如下作用：
①Sic+2O₂→Sio₂+CO₂
②Sic+4H₂O＝Sio₂+4H₂+CO₂

密度(克/厘米3) density(g/cm³⁾	莫氏硬度 Moh'shardnss	比熱仟卡/公斤.度 specific heat (Kcal/kg℃)	導(dǎo)熱系數(shù) 大卡/米.小時(shí).度 thermal conductvity (Kcal/m.h℃)	線膨脹系數(shù) (m/℃) coefficient of linear expansion(m/℃)
3.2	9.5	0.17	20	5×10-6

致使元件中Sic₂含量逐漸增多，電阻隨之緩慢增加，為之老化。如水蒸氣過多，會(huì)促進(jìn)Sic氧化，由②式反應(yīng)產(chǎn)生的H₂與空氣中的O2給合成H2O再反應(yīng)產(chǎn)生惡性循環(huán)。降低元件壽命。
氫氣(H₂)能使元件機(jī)械強(qiáng)度降低。氮?dú)?span lang="EN-US">(N₂)在1200℃以下能防止Sic氧化1350℃以上與SC發(fā)生反應(yīng)，使Sic分解氯氣(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.