摘要:
Provided are a Cu column, a Cu core column, a solder joint, and a through-silicon via, which have the low Vickers hardness and the small arithmetic mean roughness. For the Cu column 1 according to the present invention, its purity is equal to or higher than 99.9% and equal to or lower than 99.995%, its arithmetic mean roughness is equal to or less than 0.3µm, and its Vickers hardness is equal to or higher than 20HV and equal to or less than 60HV. Since the Cu column 1 is not melted at a melting temperature in the soldering and a definite stand-off height (a space between the substrates) can be maintained, it is preferably applied to the three dimensional mounting or the pitch narrowing mounting.
摘要:
A soldering flux composition which comprises: (i) zinc bromide and/or one or more amine hydrohalides and/or one more amine hydrophosphates in an amount of from 30 to 99.5 wt% based on the total weight of components (i) and (ii); and (ii) one or more fluorine-containing compounds selected from fluoroboric acid, ammonium fluoroborate, lithium fluoroborate, sodium fluoroborate and potassium fluoroborate in an amount of from 70 to 0.5 wt% based on the total weight of components (i) and (ii); and (iii) water in an amount not less than that required to solvate components (i) and (ii). The composition of the present invention is particularly useful as a soldering flux for lead-free solder alloys.
摘要:
A method of joining superalloy substrates together comprising diffusion bonding the superalloy substrates by depositing an activator directly on the surface of the joint to be bonded and thereafter subjecting the joint to heat pressure. The heat and pressure causes the surface of the superalloy, in the presence of the activator, to diffusion bond without the use of a brazing alloy. By eliminating the brazing alloy, a high strength, high temperature bond is achieved, yet there is no molten brazing alloy to be drawn through capillary action into any fine features surrounding the joint being bonded, and there is no residue left at the interface that would diminish the mechanical properties of the joint.
摘要:
A rosin-free, low VOC, no-clean soldering flux consists essentially of one or more halide-free carboxylic acid activators in an aggregate amount not exceeding about 8 % by weight of the flux; one or more alkyl amines capable of forming amine salt of the one or more activators and in an aggregate amount not exceeding about 10 % by weight of the flux; and water, with or without a surfactant. The flux is particularly useful in a method of producing soldered printed wiring assemblies with minimal residual ionic contamination, so that post-soldering cleaning of the assemblies is unnecessary.
摘要:
A coating composition for use in protecting metal, and for use as a soldering flux, and methods involving the same, especially for circuit boards. One coating material can serve as a metal corrosion inhibitor, a no-clean soldering flux, and/or a protective coating in replacement of a conformal coating. In its most preferred form, this invention serves all three functions in the manufacture of an electrical circuit board. The principal ingredient of the coating is an N - fatty acyl derivative of an amino acid.
摘要:
A method of forming a solder film on a metallic surface such as a pad of a metallic circuit of a printed circuit board and a lead frame of electronic parts, which is capable of forming a precise and fine pattern and which comprises selectively imparting tackiness to only a predetermined part of the metallic surface by means of a tacky layer-forming solution containing at least one compound selected from benzotriazole derivatives, naphthotriazole derivatives, imidazole derivatives, benzoimidazole derivatives, mercaptobenzothiazole derivatives, benzothiazole thiofatty acid derivatives, and triazine derivatives, adhering a powdered solder to the resulting tacky part, and then melting the solder by heating to thereby form a solder film.
摘要:
A solder paste consists essentially of solder metal powder, and an amount of non-corrosive water soluble flux, said water soluble flux comprising a mixture of 2 non-corrosive watersoluble components, one of which is a non-halogenated amine, preferably triethanolamine and the other of which is an organic moiety with a polar group, preferably GAFAC RE-610.
摘要:
A solder paste which comprises a mixture of Sn-Zn type lead-free solder particles and an activator-containing rosin flux containing either isocyanuric acid or a halogenoalkyl ester thereof. It is prevented from forming solder balls or voids, and can have satisfactory soldering properties. Also provided is a solder paste which comprises a mixture of lead-free tin-based solder particles comprising Sn-Ag-Cu or Sn-Zn and a flux containing a salicylamide compound. This solder paste also shows no viscosity change and has satisfactory soldering properties.