Silicon carbide (SiC) ceramics have excellent characteristics such as strong oxidation resistance, good wear resistance, high hardness, good thermal stability, high temperature strength, small coefficient of thermal expansion, high thermal conductivity, thermal shock resistance and chemical corrosion resistance. Therefore, it has already played a great role in petroleum, chemical industry, machinery, aerospace, nuclear energy and other fields, and is increasingly valued by people. For example, SiC Wobetumi de nkuku adi dwuma sɛ bearing ahorow, bɔɔl, nsu a wɔde hyɛ mu, nsɔano, nnwinnade a wɔde twa, gas turbine nhama, turbocharger rotors, screens a ɛma hann ne rocket combustion chamber linings.
SIC ceramics no su pa no ne wɔn nhyehyɛe soronko. sic yɛ aduru a ɛwɔ covalent nkitahodi a emu yɛ den, na Si-C nkitahodi a ɛwɔ SIC no mu no yɛ bɛyɛ 12%{12%{3}} enti, SIC wɔ ahoɔden a ɛkorɔn, elastic modulus kɛse ne nea ɛyɛ papa a wɔde gyina ano ne nea ɛyɛ papa a wɔde hyɛ wɔn ho so{4}} soluults, HH Alkali ano aduru te sɛ NaOH. oxidation yɛ mmerɛw sɛ ɛbɛba bere a ɔhyew wɔ mframa mu, nanso SIO2 a ɛba wɔ soro no bɛma oxygen a ɛbɛtrɛw akɔ akyiri wɔ oxidation bere mu no asiw, enti oxidation rate no nyɛ kɛse{10}} wɔ anyinam ahoɔden su ho no, SIC yɛ semiconductor, na ɛde nsu a ɛyɛ mmerɛw sen biara a wɔde ba no bɛba, na ɛde nsu a ɛho ntew no ho nsɛm a ɛkɔ so{1111111111111111110 na ɛyɛ adwuma.
sic has ne crystal forms abien. -SIC crystal structure no yɛ cubic system, na Si ne C form anim centered cubic lattice biara; 3SIC polytypes bɛboro 100 na ɛwɔ hɔ, te sɛ 4h, 15r ne 6h, a 6h polytype ne nea ɛtaa ba wɔ mfiridwuma mu dwumadie mu. abusuabɔ bi wɔ hɔ a ɛma ɔhyew no gyina pintinn wɔ SIC. ntam ahorow ahorow ntam bere a ɔhyew no ba fam sen 1600 sen ɔhyew no , sisic - ,-Sic de nkakrankakra dane no .Sic. 4H SIC no polytypes ahorow ahorow no yɛ mmerɛw sɛ wobɛhyehyɛ wɔ bɛyɛ 2000℃; 15R ne 6H polytypes no nyinaa yɛ mmerɛw sɛ wɔbɛyɛ wɔ ɔhyew a ɛkorɔn a ɛboro 2100℃; 6H SIC, ɛyɛ nea ɛyɛ den yiye mpo sɛ ɔhyew no boro 2200℃. nsonsonoe a ɛda free energies a ɛwɔ polytypes ahorow a ɛwɔ SIC no ntam no sua koraa. Enti, solid solution of trace efriities nso bɛma nsakrae aba thermal stability abusuabɔ ntam polytypes.
