多层片式电感器用NiCuZn铁氧体的低温烧结

Low temperature Sintering of NiCuZn Ferrite

利用Ｂｉ２Ｏ３作为烧结促进剂实现了ＮｉＣｕＺｎ铁氧体在９００℃以下烧结。利用ＴＧ、ＤＴＡ、ＤＤＴＡ等分析手段研究Ｂｉ２Ｏ３的低温烧结机理，并确定最佳烧结温度范围在８４０～９００℃之间。Ｘ线分析结果表明，加入Ｂｉ２Ｏ３后生成另相化合物Ｂｉ３６Ｆｅ２Ｏ５７。烧结后期少量Ｆｅ的固溶有助于稳定高温γ－Ｂｉ２Ｏ３相的立方结构，避免了冷却过程中的晶型转变。Ｂｉ３６Ｆｅ２Ｏ５７另相的存在能有效地阻止晶粒长大，从而达到改性的目的。

The sintering below 900℃ of NiCuZn ferrite is realized by using Bi 2O 3 additions.The mechanism of low temperature sintering is discussed by means of TG,DTA and DDTA,and the optimum sintering temperature range is between 850～900℃.The result shows the formation of a second phase,Bi 36 Fe 2O 57 .The solution of Fe is helpful in both stabilizing cubic structure of γ Bi 2O 3 and keeping away from crystal transitting during cooling.Bi 36 Fe 2O 57 prevents grain growth effectively,so the modification of Bi 2O 3 to NiCuZn ferrite is achieved.