EP0332384A2
Expired / Lapsed
EP
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A circuit system, a composite metal material for use therein, and a method for making the material
Assignee: Texas Instruments Inc
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Filing: 1989-03-06
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Granted: —
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Expires: 2009-03-06
Abstract
Abstract A circuit system has a semiconductor device mounted on a substrate which includes a composite metal material comprising a plurality of discrete elements of ferrous metal material such as an alloy of 36 percent nickel and the balance iron having a relatively low coefficient of thermal expansion, the discrete elements being copper-coated by electroless copper plating or the like and being pressed together and heated for sintering or diffusion-bonding the copper coatings together to form a continuous copper matrix having the discrete elements secured in dispersed relation therein for providing the composite metal material with a coefficient of thermal expansion relatively much lower than that of the copper material, the heating of the coated particles for diffusion bonding thereof being regulated for forming the continuous copper matrix while leaving the copper material of the matrix substantially free of nickel, ferrous or other constituents diffused therein from the discrete elements for providing the composite material with improved thermal conductivity.
Inventors
- 👤 Henry F. Breit
- 👤 Karen A. Auguston
- 👤 Joseph M. Gondusky
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:33
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/6875; H10W40/00; H10W40/20; H10W40/25; H10W40/257; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H10W72/00; H10W72/50; H10W72/531; H10W72/5363; H10W72/541; H10W72/5449; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/751; H10W90/754; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A composite metal material comprising a continuous matrix of a first metal material having a plurality of discrete elements of other metal materials secured in dispersed relation therein, characterized in that the discrete elements embody ferrous metal materials having relatively low coefficient of thermal expansion for cooperating with the continuous matrix material to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the continuous matrix material, and the continuous metal matrix material comprises a copper material of relatively high thermal conductivity substantially free of ferrous metal constituents therein for providing the composite metal material with improved thermal conductivity between opposite surfaces of the composite metal material.
Claim 2
Dependent Claim
115 words
A composite metal material comprising a continuous matrix of a first metal material having a plurality of discrete elements of other metal materials secured in dispersed relation therein, characterized in that the discrete elements embody ferrous metal materials having relatively low coefficient of thermal expansion for cooperating with the continuous matrix material to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the continuous matrix material, and the continuous metal matrix material comprises a copper material of relatively high thermal conductivity substantially free of ferrous metal constituents therein for providing the composite metal material with improved thermal conductivity between opposite surfaces of the composite metal material.
Claim 3
Dependent Claim
233 words
A composite metal material comprising a continuous matrix of a first metal material having a multiplicity of discrete elements of other metal materials secured in dispersed relation therein, characterized in that the discrete elements embody ferrous metal materials having relatively low coefficient of thermal expansion selected from the group of alloys having nominal compositions by weight of about 36 to 50 percent nickel and the balance iron, of about 31 percent nickel, 8 percent chromium, 8 percent cobalt and the balance iron, of about 32 percent nickel, 15 percent cobalt, 1 percent molybdenum and the balance iron, of about 38 percent nickel, 7 percent chromium and the balance iron, of about 17 percent chromium and the balance iron, of about 16.5 percent chromium, 4.5 percent aluminum, and the balance iron, of about 57 percent cobalt, 9 percent chromium and the balance iron, and of about 23 to 30 percent nickel, about 17 to 30 percent cobalt, about 0.6 to 0.8 percent manganese, and the balance iron for cooperating with the continuous matrix material to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the continuous matrix material, and the continuous matrix material comprises a copper material having relatively high thermal conductivity greater than about 8 watts/in./°C. for providing the composite metal material with improved thermal conductivity between opposite surfaces of the composite metal material.
Claim 4
Dependent Claim
233 words
A composite metal material comprising a continuous matrix of a first metal material having a multiplicity of discrete elements of other metal materials secured in dispersed relation therein, characterized in that the discrete elements embody ferrous metal materials having relatively low coefficient of thermal expansion selected from the group of alloys having nominal compositions by weight of about 36 to 50 percent nickel and the balance iron, of about 31 percent nickel, 8 percent chromium, 8 percent cobalt and the balance iron, of about 32 percent nickel, 15 percent cobalt, 1 percent molybdenum and the balance iron, of about 38 percent nickel, 7 percent chromium and the balance iron, of about 17 percent chromium and the balance iron, of about 16.5 percent chromium, 4.5 percent aluminum, and the balance iron, of about 57 percent cobalt, 9 percent chromium and the balance iron, and of about 23 to 30 percent nickel, about 17 to 30 percent cobalt, about 0.6 to 0.8 percent manganese, and the balance iron for cooperating with the continuous matrix material to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the continuous matrix material, and the continuous matrix material comprises a copper material having relatively high thermal conductivity greater than about 8 watts/in./°C. for providing the composite metal material with improved thermal conductivity between opposite surfaces of the composite metal material.
Claim 5
Dependent Claim
94 words
A composite metal material according to claim 2 further characterized in that the discrete elements embody an alloy having a nominal composition by weight of about 36 percent nickel and the balance iron, the discrete elements comprise from about 50 to 70 percent by volume of the composite metal material for providing the composite metal material with a coefficient of thermal expansion in the range from 4 PPM/°C. to 8 PPM/°C., and the continuous matrix material embodies a copper material having a thermal conductivity through the composite metal material greater than about 7 watts/in./°C.
Claim 6
Dependent Claim
56 words
A composite metal material according to claim 3 further characterized in that the discrete elements comprise about 60 percent by volume of the composite metal material for providing the composite metal material with a coefficient of thermal expansion of about 7 PPM/°C. and an effective thermal conductivity through the composite metal material of about 35 watts/in./°C.
Claim 7
Dependent Claim
81 words
A composite metal material comprising a plurality of discrete elements of ferrous metal materials of relatively low coefficient of thermal expansion having coated portions thereon of a copper material of relatively high thermal conductivity, the copper coated portions being diffusion-bonded to each other forming a continuous matrix of the copper material securing the discrete elements in dispersed relation therein to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the copper material.
Claim 8
Dependent Claim
81 words
A composite metal material comprising a plurality of discrete elements of ferrous metal materials of relatively low coefficient of thermal expansion having coated portions thereon of a copper material of relatively high thermal conductivity, the copper coated portions being diffusion-bonded to each other forming a continuous matrix of the copper material securing the discrete elements in dispersed relation therein to provide the composite metal material with a selected coefficient of thermal expansion relatively much lower than that of the copper material.
Claim 9
Dependent Claim
40 words
A composite metal material according to claim 5 wherein the diffusion-bonded copper coatings are substantially free of metal constituents diffused therein from the discrete elements for providing the composite metal material with improved thermal conductivity through the composite metal material.
Claim 10
Dependent Claim
131 words
A composite metal material according to claim 6 wherein the discrete elements embody ferrous metal materials selected from the group consisting of alloys having nominal compositions by weight of about 36 to 50 percent nickel and the balance iron, of about 31 percent nickel, 8 percent chromium, 8 percent cobalt and the balance iron, of about 32 percent nickel, 15 percent cobalt, 1 percent molybdenum and the balance iron, of about 16.5 percent chromium, 4.5 percent aluminum and the balance iron, of about 57 percent cobalt, 9 percent chromium and the balance iron, and of about 23 to 30 percent nickel, about 17 to 30 percent cobalt, about 0.6 to 0.8 percent manganese and the balance iron and the copper material has a thermal conductivity of at least about 8 watts/in./°C.
Claim 11
Dependent Claim
88 words
A composite metal material according to claim 7 wherein the discrete elements embody an alloy having a nominal composition by weight of about 36 percent nickel and the balance iron and the discrete elements comprise from about 50 to 70 percent by volume of the composite metal material for providing the composite metal material with a coefficient of thermal expansion in the range from 4 PPM/°C. to 8 PPM/°C. and with a thermal conductivity through the composite metal material in the range from 2.5 watts/in./°C. to 5 watts/in./°C.
Claim 12
Dependent Claim
51 words
A composite metal material according to claim 8 wherein the discrete elements comprise 60 percent by volume of the composite metal material for providing the composite metal material with a coefficient of thermal expansion of about 7 PPM/°C. and a thermal conductivity through the composite metal material of about 3.5 watts/in./°C.
References Cited (Backward Citations)
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