Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1995-12-13
1999-11-02
Jenkins, Daniel J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75249, 419 13, 419 28, 419 38, 419 45, 419 57, C22C 104, C22C 2100, B22F 312, B22F 324
Patent
active
059762144
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a slide member of a sintered aluminum alloy and a method of manufacturing the same, and more particularly, it relates to a slide member of a sintered aluminum alloy which has high strength, high hardness characteristics, and is further excellent in wear resistance and to a method of manufacturing the same.
Slide members of sintered aluminum alloys are typically parts for compressors such as a vane, a shoe and a side plate, and slide parts such as an oil pump rotor. In the slide member of a sintered aluminum alloy according to the present invention, aluminum nitride films which are formed by a direct nitriding method are strongly bonded with an aluminum alloy matrix and dispersed, whereby the slide member exhibits excellent wear resistance and an excellent frictional sliding property. Therefore, no surface treatment such as Ni-P plating or ferrous thermal spraying is necessary.
BACKGROUND
In general, a ferrous material is employed for a part for a compressor or a part for an oil pump. In the case of the ferrous material, however, its weight comes into question. Particularly when the ferrous material is employed for a member such as a vane or a rotor which slides at a variable speed or high speed, inertial force or centrifugal force during acceleration or deceleration following sliding and rotation are increased in proportion to the mass. Further, these forces are increased in proportion to the square of an angular speed of rotation. In order to attain a high speed using a ferrous material, therefore, the overall appliance or apparatus must be increased in size and must be extremely strongly manufactured. In addition, there is an apprehension that the efficiency of the apparatus itself is reduced.
Thus, a low specific gravity material has been watched with interest. Magnesium, which is the lightest material, cannot attain matching with peripheral members since its thermal expansion coefficient is too large. Further, it cannot withstand employment as a slide member due to low hardness or low strength.
Then, employment of a lightweight aluminum alloy has been studied. In order to reduce thermal expansion and improve wear resistance in the aluminum alloy, it has been attempted by various manufacturing methods to add mainly Si in a large amount.
First, adding Si by means of an ingot technique such as fusion casting, fusion rolling, continuous casting or the like has been studied, while no satisfactory slide member has been obtained only by dispersion of Si primary crystals. Namely, it has been impossible to provide a slide member which can substitute for a ferrous material unless surface treatment such as hard alumite treatment or Ni-P plating is carried out. Particularly in the case of a vane for a compressor which is subjected to a high speed or a high load and used under a severe sliding condition such as a substitutional florocarbon atmosphere, abrasion damage or seizure takes place. After all, it has been impossible to obtain a wear resistant slide member which can withstand a severe environment even if Si is mainly added in a large amount by means of an ingot technique such as fusion casting, fusion rolling or continuous casting.
Then, an attempt has been made to increase amounts of addition of alloy components of transition metal elements such as Fe, Ni, Cr and the like by improving the solidification rate of the fusion casting method. However, the amounts of metal elements which can form fine intermetallic compounds by being bonded with aluminum are limited. Namely, the limit for the total amount of transition metal elements is about 4 weight %, in order to improve wear resistance without deteriorating strength and toughness in case of dispersing fine intermetallic compounds of an Fe, Ni or Fe--Ni aluminide. If the elements are added in excess of this amount, coarse crystallized substances or deposits are formed at the solidification rate of the fusion casting method, to deteriorate the strength.
When elements of Zr, Ti, Mo and V are added, a matrix is
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patent: 5478418 (1995-12-01), Miura et al.
patent: 5516734 (1996-05-01), Kuszyk et al.
patent: 5543371 (1996-08-01), Katayama et al.
Kondoh Katsuyoshi
Takano Yoshishige
Fasse W. F.
Fasse W. G.
Jenkins Daniel J.
Sumitomo Electric Industries Ltd.
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