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工程零件通常都是由于其表面产生甚至会波及整个机械结构的缺陷而失效。采用热喷涂保护涂层可以满足某些苛刻服役环境的要求,化学和石油化工行业就有这样的情况。合金基体中加入硬质颗粒能均匀地提高其硬度和耐磨性。本文研究了添加两种硬质颗粒的热喷涂自熔NiCrBSiC合金的微磨料磨损性能和耐蚀性能,其中,一种添加碳化硼(B4C),另一种添加以氧化钇稳定化的氧化锆(ZrO2/Y2O3)。磨损试验用氧化铝和金刚石作磨料在自由球磨损试验机上进行,腐蚀试验在天然海水中用动电位极化法进行。研究结果表明,与未加硬质颗粒的材料相比,添加硬质颗粒强化了合金的基体,提高了涂层的耐磨性和耐蚀性。添加碳化硼的NiCrBSiC合金耐磨性高于添加氧化锆的合金。添加氧化锆和碳化硼后,合金的耐蚀性均有所提高,但添加氧化锆的合金耐蚀性更好。
Engineering parts are usually ineffective because of defects in their surface that can even affect the entire mechanical structure. The use of thermal spray coating can meet some demanding service environment requirements, the chemical and petrochemical industries have such a situation. Hard alloy particles added to the matrix can increase its hardness and wear resistance. In this paper, the wear properties and corrosion resistance of micro-abrasive wear-resistant NiCrBSiC alloy with two kinds of hard particles were studied. One kind of boron carbide (B4C) and the other kind of yttria-stabilized zirconia ZrO2 / Y2O3). Abrasion tests were performed on free-ball abrasion testers using alumina and diamond as abrasives. Corrosion tests were carried out using potentiodynamic polarization in natural seawater. The results show that the addition of hard particles strengthens the matrix of the alloy and improves the abrasion resistance and corrosion resistance of the coating as compared with the material without the hard particles. The wear resistance of NiCrBSiC alloy with boron carbide is higher than that with zirconia. After adding zirconia and boron carbide, the corrosion resistance of the alloy is improved, but the zirconium oxide added alloy corrosion resistance better.