Alloys having high electrical and mechanical characteristics, th

Details Alloys having high electrical and mechanical characteristics, th Alloys having high electrical and mechanical characteristics, th

1987-01-09

1988-06-21

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 19, 419 21, 419 23, 419 28, 419 45, 419 58, 419 32, C22C 2912

Patent

active

047523336

DESCRIPTION:

BRIEF SUMMARY
The invention relates to novel alloys which have both in particular high electrical and mechanical characteristics, the production thereof and the uses thereof in particular in the electrical, electronic and connection arts.
For a period of around ten years now, the lines of research followed by metallurgists have been directed towards improving the mechanical properties and the temperature resistance of metal alloys. In most cases, use is made of the hardening effect of particles of a second phase.
That phase may be formed by precipitation from a supersaturated solid solution. However, that procedure involves the disadvantage of giving rise to the loss of mechanical properties at high temperature, as a result of total or partial re-dissolution of the precipitates. In another procedure, fine dispersions of hard particles are introduced directly into the metal or are formed by internal oxidation of the metal in a weakly alloyed state, resulting in a high level of hardening which fades away only in the vicinity of the melting point.
Various alloys comprising a matrix based on a conductor metal M hardened by a metal oxide M'O have already been prepared using powder metallurgy technology and in situ oxidation of the metal solute of the initial alloy of the `metal matrix-metal solute` type.
The preparation of alloys of that type from an alloy powder comprising a metal in the form of a solute in a metal matrix is described in particular in U.S. Pat. No. 3,779,714. The process of that patent comprises using a mixture of oxidising agents for the internal oxidation step. It involves a metal oxide which can be reduced under the effect of heat and a hard refractory metal oxide.
The use of such a mixture under the conditions under which that process is carried into effect results in the formation of an alloy of M and M'O, study of which under an electron microscope reveals particles of oxide of a size which for the major part is greater than 0.1 .mu.m. That therefore essentially involves incoherent particles, that is to say particles which are characterised by non-continuity of the crystallographic planes at the particles-matrix interface and the absence of elastic deformation phenomena in the vicinity of the interface.
The work done by the inventors in this art have led them to find that, by using a given oxidising agent for the internal oxidation operation, and while operating under certain conditions, it is possible to produce only particles of a very small size, which are distributed in a homogeneous fashion and which make it possible to increase the elastic limit of the alloy without substantially affecting the conducting properties thereof.
The invention therefore seeks to provide novel alloys which have both high conducting and mechanical properties.
The invention also seeks to provide a process for the preparation of such alloys by internal oxidation, which is easy to carry into effect.
The invention further seeks to provide materials based on said alloys, which can be used in particular in the electrical, electronic and connection arts, in particular by virtue of their good mechanical strength and their high level of conductivity.
The alloys according to the invention which comprise a matrix based on at least one conductor metal M are characterised in that they are formed by a homogeneous dispersion in the matrix of stable coherent particles of one or more association of ions of type M, M', O in which M represents the metal or metals of the matrix, M' represents a metal different from M, capable of undergoing internal oxidation, and 0 represents oxygen.
The expression `coherent particles` denotes particles which, unlike the particles referred to as incoherent particles, which are present in alloys of type M M'O prepared in accordance with the prior art, have a continuity in respect of the crystalline planes at the interface between the particle and the metal of the matrix, and substantial deformation in the vicinity of the interface.
In general, the mean size of such particles is less than about 20 nm, in par

REFERENCES:
patent: 3893844 (1975-07-01), Nadkarni
patent: 4077816 (1978-03-01), Nadkarni
patent: 4274873 (1981-06-01), Nadkarni
patent: 4315777 (1982-02-01), Nadkarni et al.

Affiliated with

Also associated with

Rating

Alloys having high electrical and mechanical characteristics, th does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alloys having high electrical and mechanical characteristics, th, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alloys having high electrical and mechanical characteristics, th will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-928046