【摘要】 采用高温固相反应法合成了Mg₂SiO₄陶瓷粉末,冷压成型后烧结成陶瓷块材。盐涂法制备V2O5涂覆的样品,利用马弗炉在950℃空气气氛下保温不同时间。对热腐蚀后的样品进行表面形貌、截面特征的表征,并对Mg₂SiO₄的高温熔盐腐蚀机制进行分析研究。结果表明:熔融的V2O5对Mg₂SiO₄陶瓷试样产生两种形式的腐蚀降解作用,即溶解-沉淀机制形成腐蚀产物Mg₂V₂O₇和SiO₂以及沿晶界腐蚀为主的渗透腐蚀作用。更多还原

【Abstract】 In this paper,Mg₂SiO₄ ceramic powder was synthesized by high temperature solid-state reaction and sintered into ceramic bulks after cold pressing. Samples coated with V2 O5 were prepared by salt coating method. The samples were heated at 950 ℃ for different time by muffle furnace. The surface morphology and cross-section characteristics of the hot corrosion samples were characterized,and the corrosion mechanism was also studied. The results show that the melted V₂O₅ has two forms of corrosion degradation on Mg₂SiO₄ ceramic specimens,i. e. The dissolution-precipitation mechanism forms the corrosion products Mg₂V₂O₇ and SiO₂,and the penetration corrosion mainly along grain boundaries.更多还原