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：Theelementsarebrittlewithhighcold-resistanceandheat-'suneasytobeoutkfsotherphysicalpropertiesareasfollows:化学性质Chemicalproperty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+CO2②Sic+4H2O＝Sio2+4H2+CO2密度(克/厘米3)density(g/cm3)莫氏硬度Moh'shardnss比热仟卡/公斤.度specificheat(Kcal/kg℃)导热系数大卡/米.小时.度thermalconductvity(Kcal/m.h℃)线膨胀系数(m/℃)coefficientoflinearexpansion(m/℃)3.29.50.17205×10-6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***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***(Cl2)能使Sic完全分解。Ithasgoodchemicalstabilityandcorrosionhightemmperature,alkalinematerialhasanetxhingeffectonit.Ifrheelementsareusedattemperatureabove1000Cforalongtimeitwillreactwithoxideandwapourasfollowing;①Sic+2O2→Sio2+CO2②Sic+4H2O＝Sio2+4H2+CO2ItwillleadtoincreaseofSio2contents.Electricalrestancewillalsoraiseslowlyandbecomeageing.Ifthevapouristoomuch,theoxidationofsicwillbepromotrd.H2producedby②reactionbondswithO2intheairtoformH2Owhicreactwithsicagain,thuscausingwiciouscirclewhichreducesthelifeofelements.Hydrogen(H2)canreducethemechanicalstrengthofelements,whilenetrogen(N2)canpreventsicfromoxidizingattemperatureunder1200C,above11350C,nitrogenreactswithsicanddecomposeit.Chlorine(Cl2)candecomposesiccompletely.)