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作为活塞环喷膜潜在的代用材料,对五种新型含钼粉末进行了等离子喷镀和耐磨试验。镍/钼/铬/硼和钼/二氧化钼这两种喷膜的耐磨性高于钼丝喷膜。Mo/Co/Mo_2C喷膜的耐磨性高于市场上出售的钼镍合金混合粉的喷膜。Mo/MoO_2的维氏硬度(100克)为1007,结合强度为50.00兆帕(7071磅/英寸~2)。Ni/Mo/Cr/B的维氏硬度(100克)为696,结合强度为55.43兆帕(8040磅/英寸~2)。Mo/Co/Mo_2C的维氏硬度(100克)为853,结合强度为39.05兆帕(6249磅/英寸~2)。Mo/Co/Mo_2C合金粉喷镀时,发现了钴含量有所损耗。活塞环制造时广泛使用了热喷镀膜法。最常用的材料是等离子喷镀的钼镍合金混合粉和火焰喷镀的纯钼丝和纯钼粉。由于钼具有极佳的抗粘结性能,尤其在内燃机启动时具有很好的抗划伤能力,因此经常使用钼作镀层。目前在竞争十分激烈的市场中,材料的成本在活塞环总成本中所占的比例起着很重要的作用。使用钼丝喷镀法的喷膜含有MoO_2,按重量计约占8%。有几位研究工作者已经在物理和化学性能方面,评估了钼基喷膜中含氧量的影响(参考文献1-4)。在等离子喷镀的用途上,已经开发了几种生产含氧化物的金属粉的方法(参考文献5-7)。至今,使用含氧化物粉末的等离子喷膜,其耐磨性能并不相当于钼丝喷膜(参考文献8)。本论文的研究目的是为了研制等离子喷膜,使其性能等于或优于当前工业上所用的钼丝或膜粉所喷镀的镀层性能。
As a potential substitute for the piston ring spray film, five new molybdenum-containing powders were plasma-sprayed and wear-tested. The wear resistance of nickel / molybdenum / chromium / boron and molybdenum / molybdenum dioxide spray film is higher than the molybdenum wire spray film. Mo / Co / Mo_2C spray film abrasion resistance than the commercially available molybdenum-nickel alloy powder spray film. The Vickers hardness (100 g) of Mo / MoO 2 is 1007 and the bond strength is 50.00 MPa (7071 psi). The Vickers hardness (100 g) of Ni / Mo / Cr / B was 696 and the bonding strength was 55.43 MPa (8040 psi). The Vickers hardness (100 grams) of Mo / Co / Mo 2 C was 853 and the bonding strength was 39.05 MPa (6249 lbs / 2). Mo / Co / Mo_2C alloy powder spray found cobalt loss. Piston rings are widely used in the manufacture of thermal spray coating. The most commonly used materials are plasma-sprayed molybdenum-nickel alloy powder and flame-sprayed pure molybdenum wire and pure molybdenum powder. Molybdenum is often used for molybdenum because of its excellent anti-adhesive properties, especially when the internal combustion engine has good scratch resistance. Currently in the highly competitive market, the cost of materials in the total cost of the piston ring plays a very important role. The spray film using the molybdenum wire spraying method contains MoO 2, accounting for about 8% by weight. Several researchers have evaluated the effect of oxygen content in molybdenum-based spray films on physical and chemical properties (References 1-4). In the use of plasma spraying, several methods for producing oxide-containing metal powders have been developed (references 5-7). Hitherto, the use of plasma sprayed films containing oxide powders did not give the same abrasion resistance as molybdenum sprayed films (Ref. 8). The purpose of this paper is to develop a plasma spray film that is equal to or better than the coating properties of molybdenum wire or film powder currently used in industry.