超音速火焰喷涂Cr_3C_2-NiCr与WC-Co涂层高温结合性能研究

Study on Adherence of Cr_3C_2-NiCr and WC-Co Coating at High Temperature Sprayed by HVOF

采用超音速火焰喷涂在PCr Ni3Mo VA钢基体上分别制备了Cr3C2-Ni Cr与WC-Co涂层,并对涂层进行了800℃高温后续处理。用扫描电镜(SEM)观察分析两种涂层表面及涂层截面组织,分析涂层界面结合状态。用SANS CMT5305型拉伸试验机分别测试两种涂层在常温和高温处理后的结合强度。结果表明,常温下Cr3C2-Ni Cr与WC-Co涂层与基体的结合能力相似,高温下Cr3C2-Ni Cr涂层与基体的结合能力基本保持不变,而WC-Co涂层发生剥落。

Cr3 C2-NiCr and WC-Co coatings were prepared on PCrNi3MoVA steel substrate by means of high velocity oxy-fuel spraying （HVOF）, and the coating was put at 800 ℃ high temperature for subsequent processing. The surface and cross-section organization of the two kinds of coating were observed by means of scanning electron microscopy analyzed. Bonding strength of two kinds of coating （SEM）, and the interface bonding state was was tested with SANS CMT 5305 tensile testing machine respectively at normal temperature and high temperature. Results show that the adherence of Cr3C2-NiCr and WC-Co are similar at normal temperature, but at high temperature the adherence of Cr3C2-NiCr remains the same, with WC-Co coating spalling.