Technology and properties of electroless composite RE-Ni-B-SiC coatings have been investigated.Results show that stabilizer plys a decisive role in electroless composite Ni-B-SiC,the addition of appropriate quantity o...Technology and properties of electroless composite RE-Ni-B-SiC coatings have been investigated.Results show that stabilizer plys a decisive role in electroless composite Ni-B-SiC,the addition of appropriate quantity of RE(rare earth) into the Ni-B-SiC bath not only increases SiC content in composite coatings,their hardness and wear resistance but also improves crystalline fineness,Wear resistance increases with the increase of SiC.Hardness and wear resistance of composite coatings reach peak values a fter heat treatment at 4OO and 500℃ for 1h respectively.展开更多
In this study, a NiCrAIY ＋ AINiY composite coating was prepared by arc ion plating technique and sub- sequent annealing treatment. Cyclic hot corrosion tests of the composite coating and a reference NiCrAIY coating c...In this study, a NiCrAIY ＋ AINiY composite coating was prepared by arc ion plating technique and sub- sequent annealing treatment. Cyclic hot corrosion tests of the composite coating and a reference NiCrAIY coating coated with mixed salts of Na2SO4 ＋ K2SO4 and Na2SO4 ＋ NaC1 were carried out at 700 ℃. The results indicated that the composite coating performed better against the corrosion due to the gradient element distribution in Al-enriched outer layer and Cr-enriched inner layer. The corrosion mechanisms for the two coatings were also discussed.展开更多
文摘Technology and properties of electroless composite RE-Ni-B-SiC coatings have been investigated.Results show that stabilizer plys a decisive role in electroless composite Ni-B-SiC,the addition of appropriate quantity of RE(rare earth) into the Ni-B-SiC bath not only increases SiC content in composite coatings,their hardness and wear resistance but also improves crystalline fineness,Wear resistance increases with the increase of SiC.Hardness and wear resistance of composite coatings reach peak values a fter heat treatment at 4OO and 500℃ for 1h respectively.
基金supported by the National Natural Science Foundation of China(Grant No.51001106)
文摘In this study, a NiCrAIY ＋ AINiY composite coating was prepared by arc ion plating technique and sub- sequent annealing treatment. Cyclic hot corrosion tests of the composite coating and a reference NiCrAIY coating coated with mixed salts of Na2SO4 ＋ K2SO4 and Na2SO4 ＋ NaC1 were carried out at 700 ℃. The results indicated that the composite coating performed better against the corrosion due to the gradient element distribution in Al-enriched outer layer and Cr-enriched inner layer. The corrosion mechanisms for the two coatings were also discussed.
