Metal fusion bonding – Process – Using only pressure
Patent
1996-12-17
1999-11-23
Moore, Margaret G.
Metal fusion bonding
Process
Using only pressure
29525, 295252, 403 11, 403 21, 403369, 524731, 148 22, B32P 1100
Patent
active
059884835
DESCRIPTION:
BRIEF SUMMARY
This invention is concerned with anti-lubricant compositions, and relates in particular to such compositions which may be of use in the joint-producing methods described in our International Patent Application PCT/GB 91/00,950 (now published as WO 91/19,589) and a number of subsequent Applications.
In the Specification of the aforementioned PCT Application [P1220: Trib-joints] there is described and claimed a method of securing against lateral motion two bodies held in face to face asperity contact, thereby to make a join between the two bodies, in which method there is inserted into the interface between the two bodies a material that on minimal initial lateral relative motion of the two surfaces promotes rapid but controllable "galling" between the two surfaces, this galling binding the surfaces against further such motion. The material inserted into the interface, and which causes the galling, is variously referred to as a galling agent, gall promoter, gall enhancer, or anti-lubricant, and the present invention relates to particularly preferred such anti-lubricants, and to compositions thereof. Variants of this are described in the Specification of our International Patent Application PCT/GB 93/00,046 (now published as WO 93/13,908) [P1284: Trib-bond].
The method of the two aforementioned Specifications is very suitable for joining bodies that fit well together, but not always so good at joining bodies that don't, and in the Specification of our International Patent Application PCT/GB 94/00,869 (now published as WO 94/25,216) [P1286: Trib-paste] there is described and claimed another variant of the method, this variant being especially adapted for use with "ill"-fitting joints--that is, joints where it is thought that the two faces to be joined might not be in good face-to-face asperity contact, so there is a gap therebetween--in which there is employed to fill the gap a composition comprising a multiplicity of small metal particles surrounded by or coated with a gall-promoting fluid that acts as a viscous binder.
In the aforementioned WO 91/19,589 and WO 93/13,908 Specifications the preferred described anti-lubricants are said generally to be liquid, especially such a material that appears in use to act as an oxygen scavenger when placed in contact with the material of the two bodies to be joined together. Typical examples of these materials are said to be the range of polydimethylsiloxane and polymethylhydrogensiloxane liquids of viscosities generally up to 100 c/s (volatile versions of similar siloxanes can be used where the surplus liquid that exudes from the joint naturally evaporates after the joint is formed). The same materials are identified in our aforementioned WO 94/25,216 Specification, while others are there described as being similar siloxanes but with amino active side groups that are able to cross link, or "vulcanise", after the joint is made so as to form a synthetic rubber cocoon, and so prevent any small loose unbonded metal particles breaking loose in service.
Both the liquid anti-lubricant materials and the metal-particle-containing compositions of our aforementioned International Applications have proved satisfactory, but nevertheless there are occasions where the joint to be made is constructed from well-fitting parts, so that there is no need for the metal-filled viscous compositions of the latter, and yet the typically more liquid materials of the former are somewhat too fluid--or, rather, surface active--and tend to creep or even to flow out from their application site (which is not only wasteful of material, but means there is a risk of the anti-lubricant turning up where it is not wanted, which might even result in some damage being caused). It would seem that this dilemma might be solved by the provision of the anti-lubricant in the form of a composition that is a viscous fluid, a paste, a gel or even a semi-solid rubber-like material, and it is broadly this that the present invention proposes. More specifically, the invention suggests the use as the anti-lubricant of a com
REFERENCES:
patent: 5348210 (1994-09-01), Linzell
patent: 5837066 (1998-11-01), Linzell
Ball Burnishing Machine Tools Limited
Moore Margaret G.
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