中文摘要：

采用包渗法在钼表面原位制备了（Mo,W）Si2-Si3N4复合涂层,考察了其在大气中于500℃和600℃等温循环的氧化性能,利用XRD和SEM等研究了其组织形貌.结果表明：（Mo,W） Si2-Si3N4涂层具有良好的低温抗氧化性,其在空气中500℃和600℃氧化480 h的氧化速率分别为0.0145 g/（m2·h）和0.0191g/ （m2·h）,归因于涂层氧化表面形成了致密的SiO2膜.

英文摘要：

（Mo, W）Si2-Si3N4 coating on the surface of molybdenum substrate was produced by pack cementation method. The low temperature oxidation ability of （ Mo, W） Si2 -Si3N4 coating was studied by isothermal and cyclic oxidation test at 500 ℃ and 600 ℃ in air, and it＇s microstructures were analyzed by SEM and XRD. Results show that （ Mo, W） Si~-Si3N4 coating has good anti-oxidation property at 500 9C and 600 ℃ in air, the oxidation rates of which are 0. 014 5 g/（ m2. h） and 0. 019 1 g/（ m2· h） after oxidized for 480 h respectively. This is attributed to a dense SiO2 film formed on the surface of （ Mo, W） Si2 -Si3N4 coating on molybdenum substrate.