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关于水轮机耐磨损和抗汽蚀材料的研究.国内外均在探索。国外除用13铬或18—8型整体不锈钢外,常采用堆焊耐磨损和抗汽蚀保护层。但是堆焊工艺工效低,堆焊表面不平整,很难磨削加工。近年来,国外采用了喷焊自熔性合金涂层作为耐磨损和抗汽蚀的保护层。如日本采用氧乙炔火、焰喷焊超硬合金粉末涂层。涂层材料为C0.26%,Si4.72%,Cr17.41%,Ni68.39%,Fe4.2%,B2.75%。据称其耐磨性比13铬或18—8型不锈钢高得多。自熔性合金涂层中弥散分布着CrB,Ni_3B等硬质相。因此其耐磨性是同
Research on the wear-resistant and cavitation-resistant materials of hydraulic turbines is being explored both at home and abroad. In addition to 13 chromium or 18-8 foreign overall use of stainless steel, often used surfacing wear and cavitation erosion protection layer. However, surfacing process work efficiency is low, surfacing surface is not smooth, it is difficult to grinding. In recent years, foreign countries have adopted a spray-welded self-fluxing alloy coating as a wear-resistant and anti-cavitation protective layer. Such as Japan using oxyacetylene fire, flame spray welding hard alloy powder coating. The coating materials were C0.26%, Si4.72%, Cr17.41%, Ni68.39%, Fe4.2%, B2.75%. It is said to be much more abrasion resistant than 13-Cr or 18-8-type stainless steel. Self-fluxing alloy coating dispersed CrB, Ni_3B and other hard phases. So its wear resistance is the same