The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Dec. 11, 1987
Werner Baumgartner, Munich, DE;
Johannes Fellinger, Unterhaching, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
For fastening electronic components to substrates, a connecting layer having good adhesion and good electrical and thermal conductivity is manufactured by sintering from a metal powder layer. A paste formed of metal powder, such as a silver powder, and of a solvent, is processed into a solvent-free presintered film in a separate process. This film is punched in accordance with a cross-section of the component and is provided for fastening the component. In manufacturing the film, a specific solvent is employed, together with heating up rates of 5.degree. to 30.degree. C./Min and holding times of 0.5 to 5 minutes at a maximum temperature of 300.degree. C. The fastening is carried out at temperature of at least 150.degree. C. and at a minimum mechanical pressure of 30 N/cm.sup.2. The use of a film speeds up the method and enables of sintering at low temperatures and, at the same time, at low mechanical pressure.