摘要:
A Sn—Ag—Cu based solder alloy capable of increasing the connection reliability of a solder joint when evaluated in a high temperature environment is provided. The alloy has an alloy composition consisting essentially of, in mass percent, Ag: 1.0-5.0%, Cu: 0.1-1.0%, Sb: 0.005-0.025%, Fe: 0.005-0.015%, and a remainder of Sn. The Fe content in mass percent is 0.006-0.014%. The Sb content in mass percent is 0.007-0.023%. Preferably Fe:Sb as a mass ratio is 20:80-60:40. The total content of Fe and Sb is preferably 0.012-0.032%.
摘要:
A lead-free solder ball for electrodes of a BGA or CSP comprising 0.5-1.1 mass % of Ag, 0.7-0.8 mass % of Cu, 0.05-0.08 mass % of Ni, and a remainder of Sn. Even when a printed circuit board to which the solder ball is bonded has Cu electrodes or Au-plated or Au/Pd-plated Ni electrodes, the solder ball has good resistance to drop impacts. The composition may further contain at least one element selected from Fe, Co, and Pt in a total amount of 0.003-0.1 mass % or at least one element selected from Bi, In, Sb, P, and Ge in a total amount of 0.003-0.1 mass %.
摘要:
A lead-free solder ball for electrodes of a BGA or CSP comprising 0.5-1.1 mass % of Ag, 0.7-0.8 mass % of Cu, 0.05-0.08 mass % of Ni, and a remainder of Sn. Even when a printed circuit board to which the solder ball is bonded has Cu electrodes or Au-plated or Au/Pd-plated Ni electrodes, the solder ball has good resistance to drop impacts. The composition may further contain at least one element selected from Fe, Co, and Pt in a total amount of 0.003-0.1 mass % or at least one element selected from Bi, In, Sb, P, and Ge in a total amount of 0.003-0.1 mass %.
摘要:
[Problem]Mobile electronic equipment is often dropped during use or transport, and the soldered joints of electronic parts sometimes peel off due to the impact when dropped. In addition, they undergo heat cycles in which internal coils, resistors, and the like generate heat and soldered joints increase in temperature during operation of electronic equipment and cool off during periods of non-use. With a conventional Sn—Ag base lead-free solder, the impact resistance and resistance to heat cycles of minute portions such as solder bumps were not adequate. The present invention provides a lead-free solder alloy, bumps of which have excellent impact resistance and resistance to heat cycles. Means for Solving the Problem The present invention is a lead-free solder alloy comprising 0.1—less than 2.0 mass % of Ag, 0.01-0.1 mass % of Cu, 0.005-0.1 mass % of Zn, and a remainder of Sn, to which Ga, Ge, or P may be added, and to which Ni or Co may be further added.
摘要:
The present invention provides a Sn—Zn based lead-free solder which can prevent peeling of solder from soldered portions even after the passage of long periods after soldering of portions to be soldered made of Cu. A Sn—Zn based lead-free solder according to the present invention comprises 5-10 mass percent of Zn, a total of 0.005-1.0 mass percent of at least one substance selected from the group consisting of Au, Pt, Pd, Fe, and Sb, optionally a total of at most 15 mass percent of at least one substance selected from the group consisting of Bi and In, and a remainder of Sn. This Sn—Zn based lead-free solder can be made into a solder paste using a rosin flux containing a halide such as an amine hydrochloride as an activator.
摘要:
A lead-free solder which is significantly less susceptible to copper leaching when used in a molten state in which coil ends of copper wire are dipped comprises 1.5–8 mass % of Cu, 0.01–2 mass % of Co, optionally 0.01–1 mass % of Ni, and a remainder of Sn and has a liquidus temperature of 420° C. or below. The solder may further comprise at least one oxidation-inhibiting element selected from the group consisting of P, Ge, and Ga in a total amount of 0.001–0.5 mass %, and/or Ag in an amount of 0.05–2 mass % as a wettability-improving element.
摘要:
The present invention provides a Sn—Zn based lead-free solder which can prevent peeling of solder from soldered portions even after the passage of long periods after soldering of portions to be soldered made of Cu. A Sn—Zn based lead-free solder according to the present invention comprises 5-10 mass percent of Zn, a total of 0.005-1.0 mass percent of at least one substance selected from the group consisting of Au, Pt, Pd, Fe, and Sb, optionally a total of at most 15 mass percent of at least one substance selected from the group consisting of Bi and In, and a remainder of Sn. This Sn—Zn based lead-free solder can be made into a solder paste using a rosin flux containing a halide such as an amine hydrochloride as an activator.
摘要:
A therapeutic method is provided to treat eosinophil-associated hypersensitivity diseases, such as bronchial asthma, by locally administering to a mammal in need of such treatment, an effective amount of a topical anesthetic, such as lidocaine, or a pharmaceutically acceptable salt thereof.
摘要:
An inexpensive lead-free solder which prevents the occurrence of tin pest at extremely low temperatures and which has good wettability and impact resistance has a composition consisting essentially of, in mass %, Cu: 0.5-0.8%, Bi: at least 0.1% and less than 1%, Ni: 0.02-0.04%, and a remainder of Sn.
摘要:
A lead-free solder alloy suitable for use in flow soldering of electronic components to printed wiring boards comprises 0.1-3 wt % of Cu, 0.001-0.1 wt % of P, optionally 0.001-0.1 wt % of Ge, and a balance of Sn. The solder alloy may further contain at least one of Ag and Sb in a total amount of at most 4 wt %, and/or at least one of Ni, Co, Fe, Mn, Cr, and Mo in a total amount of at most 0.5 wt % in order to strengthen the alloy, and/or at least one of Bi, In, and Zn in a total amount of at most 5 wt % in order to lower the melting point of the alloy.