PROCESS FOR PRODUCING FERRITE SINTERED MAGNET AND FERRITE SINTERED MAGNET
    6.
    发明公开
    PROCESS FOR PRODUCING FERRITE SINTERED MAGNET AND FERRITE SINTERED MAGNET 有权
    FERRITSINTERMAGNET UND VERFAHREN ZU DESSEN HERSTELLUNG

    公开(公告)号:EP2881956A1

    公开(公告)日:2015-06-10

    申请号:EP13824900.8

    申请日:2013-07-24

    摘要: A sintered ferrite magnet comprising main phases of ferrite having a hexagonal M-type magnetoplumbite structure, first grain boundary phases existing between two main phases, and second grain boundary phases existing among three or more main phases, the second grain boundary phases being dispersed in its arbitrary cross section, and the second grain boundary phases having an average area of less than 0.2 µm 2 , are produced by calcining, pulverizing, molding and sintering raw material powders having the general formula of Ca 1-x-y La x A y Fe 2n-z Co z , wherein 1-x-y, x, y and z and n representing a molar ratio are in desired ranges; 1.8% or less by mass of SiO 2 and 2% or less by mass (as CaO) of CaCO 3 being added to a calcined body after calcining and before molding; and the sintering step being conducted with a temperature-elevating speed of 1-4°C/minute in a range from 1100°C to a sintering temperature, and a temperature-lowering speed of 6°C/minute or more in a range from the sintering temperature to 1100°C.

    摘要翻译: 一种烧结铁氧体磁体,包括具有六方M型磁铅石结构的铁素体的主相,存在于两个主相之间的第一晶界相和存在于三个或多个主相之间的第二晶界相,第二晶界相分散在其中 通过煅烧,粉碎,成型和烧结具有通式Ca 1-xy La x A y Fe 2n-1的原料粉末制造平均面积小于0.2μm2的第二晶界相, z Co z,其中1-xy,x,y和z和n表示摩尔比在所需范围内; 1.8%以下的SiO 2和2质量%以上的CaCO 3作为CaO,在煅烧后和成型前加入到煅烧体中; 并且烧结步骤在1100℃至烧结温度范围内以1-4℃/分钟的升温速度进行,并且降温速度为6℃/分钟以上 烧结温度至1100℃。