发明名称 |
Circuit units, substrates therefor and method of making |
摘要 |
A layer of ceramic material such as alumina is plasma-deposited on a sheet member such as molybdenum or a composite laminate of molybdenum and graphite or other material of low thermal expansion to form a circuit unit substrate having a thick, adherent, electrically-insulating coating on a light, rigid and thermally-conducting base. Thick and thin film materials are deposited and fired on the insulating coating to provide conductors, insulators or resistors or the like in a circuit unit. The materials of the sheet member and of the insulating coating are selected to have matching thermal expansion coefficients so that the substrate remains flat and free of bowing during the firing of the thick and thin film materials. The plasma-deposited electrically-insulating layer is sealed to prevent moisture absorption during use.
|
申请公布号 |
US5276423(A) |
申请公布日期 |
1994.01.04 |
申请号 |
US19910790933 |
申请日期 |
1991.11.12 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
BREIT, HENRY F.;FORSTER, JAMES A. |
分类号 |
H01C1/012;H01L21/48;H01L23/057;H01L23/373;H01L23/64;(IPC1-7):H01C1/012 |
主分类号 |
H01C1/012 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|