【作者】 林国标； 柴立民； 左珑；

【Author】 LIN Guo-biao;CHAI Li-min;ZUO Long BGRIMM Magnetic Materials & Technology Co., LTD, Beijing, 100054, China

【机构】 北矿磁材科技股份有限公司磁器件分公司；

【摘要】 有时烧结铁氧体表面会出现不同于基体颜色的一块块的斑点,常称为“花斑”。本文从二次工艺入手,针对出现“花斑”的磁体所使用的同一批预烧料,应用不同添加剂如（NH₄）₂SO₄、H₂SO₄、NH₄HCO₃、SrSO₄ 等,研究对磁体表面状况及磁性能的影响;“花斑”的出现与预烧料关系很大,在二次工艺中加适量的NH₄HCO₃,控制浆料pH≤9 将可避免“花斑”出现。更多还原

【Abstract】 The one block behind another of spots different from base color that sometimes appear on the surface ofsintered ferrite magnets are often called‘flower spots’. Using the same batch pre-sintered materials with the just-statedand applying different additives such as （NH₄）₂SO₄, H₂SO₄, NH₄HCO₃, SrSO₄ during the second process, their effectson both appearance and magnetic properties of magnets were investigated. The pre-sintered ferrite is important to thecoming of the‘flower spots’. During the second process, addition of suitable amount of NH₄HCO₃ and controllingslurry PH≤9 will avoid‘flower spots’.更多还原