| abstract |
The invention is applicable to the field of metal soft magnetic powder cores, and provides a method for preparing a MnO-SiO 2 insulating-coated metal soft magnetic powder core. The method comprises the following steps: adding a silane coupling agent into the MnO 2 powder, The powder is modified to make it rich in hydroxylation; metal magnetic powder and ethanol are added to the obtained modified MnO mixed solution, stirred and dried to obtain MnO insulating coated metal magnetic powder; the obtained MnO insulating coated The metal magnetic powder is sieved, sieved and granulated, and pressed into a green body; the obtained green body is heated and annealed to obtain a finished product of a metal soft magnetic powder core coated with MnO-SiO 2 insulation. The MnO 2 cladding layer is transformed into a MnO-SiO 2 cladding layer through high-temperature annealing, and the MnO-SiO 2 clad insulating layer formed by the in-situ reaction of Si in the metal magnetic powder and MnO 2 is relatively uniform and dense, and the MnO-SiO 2 cladding layer is relatively uniform and dense. The coating is resistant to high temperature and is not easy to decompose and fall off, which effectively solves the problem that the phosphoric acid passivation layer is easily decomposed at high temperature. |