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以WC、Al2O3、Co为粉末原料,采用干磨混合、湿磨分散工艺,制备了分散均匀、稳定性好的WC-Al2O3-Co和WC-Co料浆。然后用常温喷涂法将该料浆喷涂在45钢基体表面形成预涂层,再对该预涂层进行电接触强化。对强化层进行金相观察、扫描电镜观察和X射线衍射分析,以及抗热震实验和显微硬度测试。结果表明:与热喷涂WC-Co强化层相比,用常温喷涂+电接触强化制备的WC-Al2O3-Co涂层和WC-Co涂层的显微硬度和抗热震性能都得到明显提高;用Al2O3代替部分Co形成的WC-Al2O3-Co涂层的显微硬度比WC-Co涂层略高,但抗热震性能略低。
The WC-Al2O3-Co and WC-Co slurries with uniform dispersion and good stability were prepared by dry milling and wet-grinding dispersion with WC, Al2O3 and Co as raw materials. Then, the slurry is sprayed on the surface of the 45 steel substrate to form a precoating layer by spraying at normal temperature, and the precoating layer is further electrochemically strengthened. The strengthening layer was observed by metallography, scanning electron microscopy and X-ray diffraction analysis, and thermal shock resistance test and microhardness test. The results show that the microhardness and thermal shock resistance of WC-Al2O3-Co and WC-Co coatings prepared by room temperature spraying and electrical contact strengthening are obviously improved compared with those of WC-Co. The hardness of WC-Al2O3-Co coating formed by Al2O3 instead of some Co is slightly higher than that of WC-Co coating, but the thermal shock resistance is slightly lower.