THERMAL SPRAY COATING AND COMPOSITE THERMAL SPRAYING MATERIAL

PROBLEM TO BE SOLVED: To provide a thermal spray coating which is not eroded even when repeatedly used, and has durability (an elongated life) in molten metal. SOLUTION: The thermal spray coating is obtained by successively depositing first to third thermal spraying layers on the substrate to be pro...

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Bibliographic Details
Main Authors YASUDA TSUJIHIKO, HANNOU AKIYOSHI
Format Patent
LanguageEnglish
Published 28.08.2002
Edition7
Subjects
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Summary:PROBLEM TO BE SOLVED: To provide a thermal spray coating which is not eroded even when repeatedly used, and has durability (an elongated life) in molten metal. SOLUTION: The thermal spray coating is obtained by successively depositing first to third thermal spraying layers on the substrate to be protected. The first thermal spraying layer is formed of a heat resistant alloy having a thermal expansion coefficient close to that of the substrate to be protected. The second thermal spraying layer has a composition containing, by mass, about 30 to 70% molybdenum boride (MoB), about 20 to 40% nickel(Ni) or cobalt(Co), about 5 to 20% chromium(Cr), and about 5 to 10% metallic boride of at least one kind selected from Cr, W, Zr, Ni and Nb. The third thermal spraying layer has a composition containing about 25 to 75% ceramic powder which has nonwettability to molten light metal and about 75 to 25% molybdenum boride(MoB) powder.
Bibliography:Application Number: JP20010033343