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以Fe901、Ti、B_4C和h-BN粉为原料,采用反应等离子熔覆方法在Q235钢基本上原位合成了含钛陶瓷相增强Fe基合金熔覆层。研究表明:相比B_4C,Fe更易与h-BN反应形成铁硼化物,当同时添加B_4C和h-BN时,B_4C/h-BN比减小至一定值后将导致熔覆层中Fe B含量升高和Ti_2N、Ti B等中间产物形成,但却可抑制陶瓷相长大。熔覆层显微组织均具有梯度分布特征,Ti B_2大小和形态受熔池温度和成分影响。熔覆层显微硬度随h-BN添加量增加而降低,Ti:B_4C:BN摩尔比为3:1:0时熔覆层近表面层HV_(0.2)显微硬度可高达11.26 GPa。
Using Fe901, Ti, B_4C and h-BN powders as raw materials, the reactive plasma cladding method was used to synthesize the Fe-based ceramic cladding layer containing the titanium-containing ceramic phase in Q235 steel. The results show that Fe is easier to react with h-BN to form iron boride than B_4C. When B_4C and h-BN are added at the same time, the decrease of B_4C / h-BN to a certain value will lead to the increase of Fe B content Elevated and Ti_2N, Ti B and other intermediate products, but it can inhibit the ceramic phase growth. The microstructure of the cladding layer has gradient distribution, and the size and morphology of TiB_2 are affected by the temperature and composition of the weld pool. The microhardness of the coating decreases with the increase of the content of h-BN. The microhardness of HV 0.2 near the surface of the cladding layer can reach as high as 11.26 GPa when the Ti: B 4 C: BN molar ratio is 3: 1: 0.