Abstract:
Disclosed is an electrically conductive paste which enables to reduce the level of void growth in a conducting pathway formed in a joint part produced after curing the electrically conductive paste in the implementation of an electronic component on a circuit board by using the electrically conductive paste, and which contains a reduced amount of a viscosity-adjusting/thixotropy-imparting additive. Two Sn-containing low-melting-point alloy particles having different melting points and different average particle diameters are selected as electrically conductive filler components to be used in an electrically conductive paste, and the two alloy particles are mixed at a predetermined ratio for use.
Abstract:
A wiring board for mounting semiconductor device, includes at least a dielectric film 1; wirings formed in the dielectric film 1; a plurality of electrode pads provided at front and back surfaces of the dielectric film with their surfaces exposed and at least portions of lateral sides of them buried into the dielectric film; vias connecting the wirings and the electrode pads. At least one via connecting each other the wirings formed in the dielectric film includes second material different from first material forming the vias connecting the wirings and the electrode pads. The wiring board for mounting semiconductor device, is effective for an increase in terminals and finer pitch of terminal intervals due to an improvement in integration, performance or multi-function of semiconductor devices, can mount semiconductor devices especially on both sides of the board at a high density and high accuracy, and furthermore, is excellent in reliability as well.
Abstract:
The invention provides a technique of converting C1-9 or C11 composite silver nanoparticles into a paste by the use of a resin exhibiting non-fluidity at 10°C or below in order to inhibit the nanoparticles from agglomeration in storage, that is, a non-fluid paste of such nanoparticles. A composite silver nanopaste prepared by mixing a metal component containing as the essentials composite silver nanoparticles constituted of both silver cores which are made of silver atom aggregates and have a mean particle diameter of 1 to 20nm and organic coats which cover the cores respectively and are made of at least one member selected from among alcohol residues, alcohol molecule derivatives and alcohol molecules which each contain 1 to 9 or 11 carbon atoms with a resin, characterized in that at 10°C or below, the resin is in a non-fluid state to keep the metal component in a dispersed state, while on heating, it can be fluidized to permit coating.
Abstract:
PROBLEM TO BE SOLVED: To provide a conductive bonding material surely mountable by primary reflow heating and prevented from re-melting in secondary reflow heating, an electronic component using the conductive bonding material, and an electronic device with the electronic component mounted thereon.SOLUTION: The conductive bonding material contains copper particles coated with either gallium or a gallium alloy, and either tin particles or tin alloy particles. It is prefarably that the gallium alloy is one of Ga-Ni alloy, a Ga-Cu alloy, a Ga-Sn alloy and a Ga-Au alloy, the volume average particle diameter of copper particles is 0.5 μm or more and 30 μm or less, the average thickness of a coating film containing either the gallium or the gallium alloy is 0.5 μm or more and 10 μm or less, and the like.
Abstract:
There are provided are an adhesive composition that keeps storage stability and further gives a cured product wherein metallic bonds are formed in the state that the cured product wets its components and is satisfactorily spread between the components (or parts), thereby turning excellent in adhesive property, electroconductivity, and reliability for mounting such as TCT resistance or high-temperature standing resistance; an electronic-component-mounted substrate using the same; and a semiconductor device. The adhesive composition comprises electroconductive particles (A) and a binder component (B), wherein the electroconductive particles (A) include a metal (a1) having a melting point equal to or higher than the reflow temperature and containing no lead, and a metal (a2) having a melting point lower than the reflow temperature and containing no lead, and the binder component (B) includes a thermosetting resin composition (b1) and an aliphatic dihydroxycarboxylic acid (b2).