Abstract:
PROBLEM TO BE SOLVED: To provide a composition which is electrically and thermally conductive, inexpensive and sturdy and is used in forming mutual connections between electric elements at low process temperatures.SOLUTION: A composition contains an organic binder containing particles of three or more metals or metal alloys and optionally a flux in specified applications. A first type of a particle is a composition containing a reactive high-melting-point metal which reacts with a reactive low-melting-point metal in another particle to form an intermetallic compound, and the low-melting-point metal are provided in two different particle forms: a first reactive low-melting-point metal particle contains a carrier which facilitates the reaction with the reactive high-melting-point metal; and a second reactive low-melting-point metal particle acts as a source of reactive low-melting-point metal particle. The combination of the three types of particles reduces undesirable characteristics of the carrier metal, secures effective metal reactions and improves the effects further in some embodiments.
Abstract:
A wiring board comprises: an electrically insulated base material comprising a non-compressed member and a thermosetting member; a first wiring and a second wiring that are formed with the electrically insulated base material interposed therebetween; and via-hole conductors that penetrate the electrically insulated base material, and electrically connect the first wiring and the second wiring. The via-hole conductors comprise resin sections and metal sections. The metal sections comprise first metal sections the main ingredient of which is Cu, second metal sections the main ingredient of which is Sn-Cu alloy, and third metal sections the main ingredient of which is Bi. The second metal section is larger than the first metal section, and larger than the third metal section.
Abstract:
PROBLEM TO BE SOLVED: To reduce a via-hole resistance, and increase the strength of a via-hole part in a multilayer wiring board in which a conductive paste having copper powder and solder powder is used for a via-hole conductor.SOLUTION: The multilayer wiring board 110 has: an electrically insulative base material 130 composed of an incompressible member; a plurality of wiring lines 120; and a via-hole conductor 140. The via-hole conductor 140 comprises: a resin part 200; and a metal part 190 including at least a first metal region 160 consisting primarily of copper, a second metal region 170 consisting primarily of a tin-copper alloy, and a third metal region 180 consisting primarily of bismuth. The second metal region 170 is larger than a discrete piece of the first metal region 160 and a discrete piece of the third metal region 180; in the second metal region 170, such pieces of the first and third metal regions 160 and 180 are sprinkled so as not to be in contact with one another. The second metal region 170 contains an intermetallic compound CuSnand an intermetallic compound CuSn; the ratio of CuSn/CuSn is 0.10 or less.
Abstract:
PROBLEM TO BE SOLVED: To provide a conductive bonding material that can form a metal coating that is preferable in lustrous property after being melted by heat and allows an automatic appearance inspection apparatus to be applicable, and to provide a conductor bonding method using the conductive bonding material, and a semiconductor device production method.SOLUTION: The conductive bonding material includes: a first metal particle; a second metal particle having an average particle diameter larger than an average particle diameter of the first metal particle; and a third metal particle having an average particle diameter larger than the average particle diameter of the first metal particle, a relative density larger than a relative density of the first metal particle, and a melting point higher than a melting point of the second metal particle.