Preparation of oxidation protective MoSi2-SiC coating on graphite using recycled waste MoSi2 by one-step spark plasma sintering method
Preparation of oxidation protective MoSi2-SiC coating on graphite using recycled waste MoSi2 by one-step spark plasma sintering method
复制标题
一步放电等离子烧结法利用回收废MoSi2制备石墨氧化防护MoSi2-SiC涂层
DOI：
10.1016/j.ceramint.2019.07.220
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Feng Peizhong
中科院分区：
文献类型：
--
作者：
Chen Peng;Zhu Lu;Ren Xuanru;Kang Xueqin;Wang Xiaohong;Feng Peizhong
为了在回收利用钼资源的基础上快速可控地制备MoSi 2-SiC涂层，以废旧MoSi 2发热体棒为原料，采用SPS法在石墨基体上一步制备MoSi 2-SiC涂层。研究了涂层在1400 °C和1200 °C空气中的氧化行为。结果表明，涂层主要由MoSi 2、SiC和Si组成，即SiC相是在短时间烧结过程中合成的。制备的涂层厚度约为600 μm，结构致密，无裂纹。通过划痕试验测试了涂层的结合强度，MoSi 2-SiC涂层的结合强度为41.25N。高温氧化后，涂层表面形成了致密、光滑的SiO2膜。SiO2保护膜可以阻止氧化过程中氧的扩散。结果表明，氧化样品的质量变化符合抛物线规律，在1400 °C下氧化90 h后，最终质量增加为9.932 mg/cm 2。
In order to prepare MoSi2–SiC coating rapidly and controllably on the basis of recycling of Mo resources, waste MoSi2heating element rods were used as raw materials to fabricate MoSi2–SiC coating on graphite substrate by SPS method through one step. Microstructural evolution and phase transformation of the coating before and after oxidation were characterized and the oxidation behaviors of deposited coating were studied in air at 1400 °C and 1200 °C. The results showed that the coating was mainly composed of MoSi2, SiC and Si, which means that the SiC phase was synthesized in a short-time sintering process. The prepared coating was about 600 μm in thickness, presenting a dense structure without any cracks. The adhesive strength of prepared coating was tested by scratch test and the adhesive strength of MoSi2–SiC coating is about 41.25 N. After high temperature oxidation, the coating surface was covered by a dense and smooth SiO2film. The protective SiO2film could prevent the diffusion of oxygen during oxidation. As a result, the mass change of oxidation sample followed a parabolic law and the final mass gain was 9.932 mg/cm2after 90 h oxidation at 1400 °C.