New generation of plasma-sprayed mullite coatings on silicon carbide
New generation of plasma-sprayed mullite coatings on silicon carbide
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DOI：
10.1111/j.1151-2916.1995.tb08236.x
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发表时间：
1995-03
影响因子：
3.9
通讯作者：
Kang N. Lee;Robert Miller;N. Jacobson
中科院分区：
文献类型：
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作者：
Kang N. Lee;Robert Miller;N. Jacobson
莫来石是一种很有前途的硅基陶瓷高温防护涂层。传统的等离子喷涂法制备的莫来石在热循环过程中容易开裂和脱粘。结果表明，这种行为是由于在常规喷涂莫来石中存在无定形莫来石。在等离子喷涂过程中加热SiC基体消除了非晶相，并产生了性能显著改善的涂层。新涂层在室温至1000至1400 C之间的热循环下表现出优异的附着力和抗裂性。初步测试表明，良好的耐Na2CO3引起的热腐蚀。
Mullite is promising as a protective coating for silicon-based ceramics in aggressive high-temperature environments. Conventionally plasma-sprayed mullite on SiC tends to crack and debond on thermal cycling. It is shown that this behavior is due to the presence of amorphous mullite in the conventionally sprayed mullite. Heating the SiC substrate during the plasma spraying eliminated the amorphous phase and produced coatings with dramatically improved properties. The new coating exhibits excellent adherence and crack resistance under thermal cycling between room temperature and 1000 to 1400 C. Preliminary tests showed good resistance to Na2CO3-induced hot corrosion.