Sinter joining method and sintered composite member produced by same
AssigneeKomatsu Ltd.
InventorsTakemori Takayama, Yuichi Hori, Hirotaka Kato
Life of this patent
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Abstract
A sinter-joining method for forming a sinter of high quality at low cost and a sintered composite member produced by the sinter-joining method. A tubular copper-base material is forced into a tubular iron-base material and these materials are sintered at temperatures equal to and higher than 600.degree. C. so that the copper-base material expands and pressure-joins to the iron-base material. Then, the materials are sintered at temperatures equal to and higher than 850.degree. C. so that the compactness of the copper-base material is increased. Through these steps, the sintered composite member containing the copper-base material joined to the inside of the iron-base material is obtained.
Claims12
A sinter-joining method for joining a copper-base material to an iron-base material, the method comprising the steps of:
- (a) heating the copper-base material, which is composed of at least three components including at least one of:
- (i) at least one metal and (ii) at least one semi-metallic element which has ability to give expansibility, in contact with a bore of the iron-base material at temperatures equal to and higher than 600.degree. C. for a specified time so that the copper-base material expands and joins to the iron-base material, and
- (b) further heating the copper-base and iron-base materials at temperatures equal to and higher than 800.degree. C. to increase the compactness of the copper-base material.
A sintered composite member, comprising a copper-base material and an iron-base material, said copper-base material and said iron base material being sinter-joined,
- the sinter-joining includes:
- (a) the copper-base material being heated in contact with a bore of the iron-base material at temperatures equal to and higher than 600.degree. C. for a specified time so that the copper-base material expands and joins to the iron-base material, and the copper-base material being composed of at least three components including at least one of:
- (i) at least one metal and (ii) at least one semi-metallic element which has ability to give expansibility, and (b) the copper-base and iron-base materials being further heated at temperatures equal to and higher than 800.degree. C. to increase the compactness of the copper-base material.
Dependencies are inferred from the claim text.