烧结压力对SPS制备MoSi_(2)涂层高温抗氧化性能的影响  

Influence of sintering pressure on high-temperature oxidationresistance of MoSi_(2) coating prepared by SPS

作　　者：茅晨浩 朱路 任宣儒[1] 王晓虹[1] 张平[1] 冯培忠[1] Mao Chenhao;Zhu Lu;Ren Xuanru;Wang Xiaohong;Zhang Ping;Feng Peizhong(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116

出　　处：《材料与冶金学报》2023年第5期456-463,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(51874305,51972338);江苏省研究生科研创新计划项目(KYCX21_2413)。

摘　　要：以废弃硅钼棒为原料,采用放电等离子烧结(spark plasma sintering, SPS)技术在钽基体上制备出MoSi_(2)涂层,研究了烧结压力对涂层微观形貌及其1 600℃下抗氧化性能的影响.结果表明:在10~40 MPa的范围内,提高烧结压力可增强涂层的致密性和阻氧能力,并且涂层表面大尺寸的裂纹消失,仅存在少量的微裂纹;经1 600℃氧化50 h后,烧结压力分别为20,30,40 MPa下所制备的涂层表面均完整无剥落,并形成连续的SiO_(2)保护膜,可有效阻碍氧气扩散;当烧结压力为40 MPa时,涂层的质量增益最低(7.4 mg/cm~2),其扩散层和玻璃膜较薄,此时涂层表现出最佳的防护效果.MoSi_(2) coatings were prepared on tantalum substrates by spark plasma sintering(SPS)method using spent MoSi_(2) heating elements as raw materials.The effects of sintering pressure on the micromorphologies and oxidation resistance of MoSi_(2) coatings at 1600℃were studied.The results show that with the increasing sintering pressure(10~40 MPa),the densification and oxidation resistance of the coating was enhanced,and large-sized cracks on the surface of the coating disappeared,with the observation that a few microcracks existed;After 50 h oxidation at 1600℃,the coatings prepared under the pressure of 20,30,40 MPa had a complete surface without any peeling,and a continuous SiO_(2) protective layer was formed,which effectively hindered the diffusion of oxygen;When the pressure was 40 MPa,the mass gain of the MoSi_(2) coating was the lowest(74 mg/cm^(2)),and the diffusion layers and glassy layer were thinner,thus showing improved oxidation resistance.

关 键 词：废弃MoSi_(2) 抗氧化涂层 烧结压力 放电等离子烧结 钽基体 

分 类 号：TG174[金属学及工艺—金属表面处理]