There is provided a solder work material for forming solder-coated circuit boards, which is capable of preventing the malfunction of circuit that may be caused to generate by voltage noises that tend to be generated by the volumetrical expansion of the flux residue in a soldered laminated ceramic capacitor, etc. even under the environments where temperatures fluctuate widely (for example, -40.degree. C. to +85.degree. C.), or that may be caused to generate by voltage noises to be generated by the fluctuation of parasitic capacity between circuits which may be caused to generate due to a flux residue. There is also provided a circuit board having a residual film of flux left thereon after the deposition of the solder work material. This solder work material is formed of a solder paste composition or a resin flux-cored solder, both comprising a flux containing, as a resin component, acrylic resin for preventing the generation of voltage noises in electronic devices. The circuit board is accompanied with a residual film of such a flux.
A method of attaching a capacitor (112) to a substrate (100) includes applying a flux (108) to respective capacitor pads (104, 106) on the substrate (100). The capacitor (112) is placed on the fluxed capacitor pads (104, 106) and a reflow operation is performed on the capacitor (112) and the substrate (100) such that intermetallic interconnects (128) are formed between the capacitor (112) and the substrate (100).
A compound for a rare-earth bonded magnet includes a rare-earth alloy powder and a binder. The rare-earth alloy powder includes at least about 2 mass % of Ti-containing nanocomposite magnet powder particles with a composition represented by (Fe.sub.1-mT.sub.m).sub.100-x-y-zQ.sub.xR.sub.yM.sub.z, where T is Co and/or Ni; Q is B with or without C; R is at least one rare-earth element substantially excluding La and Ce; M is at least one metal element selected from Ti, Zr and Hf and always includes Ti; and 10<x.ltoreq.20 at %; 6.ltoreq.y<10 at %; 0.1.ltoreq.z.ltoreq.12 at %; and 0.ltoreq.m.ltoreq.0.5. The particles include at least two ferromagnetic crystalline phases, in which hard magnetic phases have an average crystal grain size of about 10 nm to about 200 nm, soft magnetic phases have an average crystal grain size of about 1 nm to about 100 nm; and the average crystal grain size of the soft magnetic phases is smaller than that of the hard magnetic phases.
