一种硬质合金用亚微米晶陶瓷涂层及制备方法

Submicron crystalline ceramic coating for hard alloy and preparation method

Abstract

本发明提供了一种硬质合金用亚微米晶陶瓷涂层及制备方法,所述亚微米晶陶瓷涂层组分包括:Al2O3、ZrO2、TiO2、SiO2;其制备方法是分别取粉末料混合后加热熔化,水淬,得到非晶体陶瓷后球磨,得到非晶陶瓷粉末;向非晶陶瓷粉末中添加Co粉后,加溶剂湿磨,得到涂层浆料;将涂层料浆涂覆于硬质合金表面,干燥后;真空环境下烧结,得到硬质合金用亚微米晶陶瓷涂层;本发明解决了SAZ陶瓷涂层烧结温度高、热膨胀系数与硬质合金不匹配等问题,制备的涂层具备耐高温、耐腐蚀的优点,制备方法简单,可以大幅度降低硬质合金涂层的生产成本,一定程度解决实际工况下硬质合金部件氧化、腐蚀、磨损等失效问题,延长硬质合金材料及装备的使用寿命。
The invention provides a submicron crystalline ceramic coating for a hard alloy and a preparation method. The components of the submicron crystalline ceramic coating comprise Al2O3, ZrO2, TiO2, and SiO2. The preparation method comprises the following steps: respectively weighing powder materials, mixing the powder materials, heating to smelt the mixture, carrying out water quenching on the mixture to obtain non-crystalline ceramic, and ball-milling to obtain non-crystalline ceramic powder; adding Co powder into the non-crystalline ceramic powder, adding a solvent, and wet-milling to obtain coating slurry; coating the surface of the hard alloy with the coating slurry, drying the hard alloy, and sintering the hard alloy in a vacuum environment to obtain the submicron crystalline ceramic coating for the hard alloy. According to the invention, problems that the sintering temperature of SAZ ceramic coating is high, and the thermal expansion coefficient is not matched with the hard alloy are solved, the prepared coating has the advantages of high-temperature resistance and corrosion resistance, the preparation method is simple, the production cost of the hard alloy coating can be greatly reduced, such failure problems as oxidation, corrosion and attrition of hard alloy components under actual working conditions are solved to a certain extent, and the service lives of hard alloy materials and devices are prolonged.

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