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:
Mar. 30, 2010
Filed:
Jul. 18, 2007
Kenji Okamoto, Wako, JP;
Takeshi Kato, Wako, JP;
Kenichi Nonaka, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
Provided is a method of joining members having different thermal expansion coefficients, capable of joining them at a temperature lower than the melting point of Ag to obtain a joining layer having excellent durability to a thermal cycle. First Ag particleshaving an average particle diameter of 50 nm or less and an Ag foilor metal foilhaving a smaller modulus of longitudinal elasticity than that of Ag are placed between two types of membersandat least one of which has a lower thermal expansion coefficient than that of Ag, heated to join the membersand. A wax material, which is a powder mixture containing first Ag particles having an average particle diameter of 50 nm or less and second Ag particles or particles of a metal (having a modulus of longitudinal elasticity than that of Ag) having an average particle diameter of 20 μm or more and being contained in a volume fraction of 10 to 40% relative to a total volume of the powder mixture, is placed between the two types of membersand, heated to join the membersand. The metal foiland the particles of a metal have an Ag coating layer on a surface thereof. The first memberis formed of one type of material selected from the group consisting of Si, SiC, AlO, AlN and SiNand the second member is formed of Al or Cu.