中文摘要：

在H13钢基体上采用超音速火焰喷涂方式制备一定厚度的WC-10Co-4Cr和Cr3C2-25NiCr涂层。为了增加WC-10Co-4Cr涂层的热稳定性,在涂层和基体之间加喷了NiCr喷涂粉末。研究了这两种硬质合金涂层的表面及横截面的微观形貌、抗热震性和耐磨损性能。从热力学的角度解释了两种涂层中出现的碳扩散现象。Cr3C2-25NiCr涂层的结合强度（64.40 MPa）和WC-10Co-4Cr涂层的结合强度（61.69 MPa）基本相同。通过摩擦磨损试验研究发现,两种涂层在600℃的摩擦因数均比在500℃时的小,Cr3C2-25NiCr的耐磨损性能比WC-10Co-4Cr的要好。

英文摘要：

WC?10Co?4Cr and Cr3C2?25NiCr coatings were deposited on H13 steel by high velocity oxy fuel (HVOF) spraying. To enhance the thermal stability of the WC?10Co?4Cr coating, NiCr powders were sprayed between the surface coating and substrate. The microstructures of the surface and cross section, thermal shock and wear resistance of these two coatings were investigated in detail. The carbon diffusion in the two coatings was explained from the view of the thermodynamic. And the adhesive strength of Cr3C2?25NiCr coating (64.40 MPa) is almost the same as that of WC?10Co?4Cr coating (61.69 MPa). The friction tests show that the Cr3C2?25NiCr coating has higher friction coefficient than the WC?10Co?4Cr coating at both 500 and 600 °C. The wear resistance of the Cr3C2?25NiCr coating is better than that of the WC?10Co?4Cr coating.