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高硬度耐蚀机能强的MIM资料


 

宣布日期：[2024/10/25]
 
440B和440C的马氏体不锈钢是MIM制作中经常使用的资料，但他们液相烧结的温度规模很是窄，烧结进程中变形、局部坍塌等不良品较多。

高硬度、耐侵蚀请求限定了MIM资料的挑选

MIM件利用于手动东西，切割磨削东西（比方刀具，刮胡刀，内科手术东西），小五金（比方手机零部件）和汽车策念头中的汽油喷嘴零部件等场所时，凡是请求资料的硬度大于55HRC，还要有必然的耐蚀机能。

MIM工艺中能知足这些机能的资料绝对较少。通经常使用的是440B和440C的马氏体不锈钢。但是，这些资料很难烧结；液相烧结的温度规模很是窄，这致使了在统一个烧结炉中密度散布不均，尺寸缩短变更大和整机局部融化坍塌。

为了削减变形和局部坍塌，凡是是将440B和440C经由进程固相烧结烧到孔隙闭合的中等密度，再经由进程无模热等静压致密，额定的工艺大大增添了全部制作的用度。

注：HRC是接纳150Kg载荷和120°金刚石锥压入器求得的硬度，用于硬度极高的资料。压痕越浅，HR值越大，资料硬度越高。

改进性马氏体不锈钢440C-Nb

一种改进型的马氏体不锈钢“440C-Nb呈现了，这类合金有更宽的烧结窗。

440C-Nb系统能够获得一个宽度约为25°C的烧结窗（温度规模界说在烧结密度不低于7.63g/cm³而不引发坍塌和局部融化）。这个温度规模对规范的产业烧结炉，不管是批次炉仍是持续炉都绝对轻易到达。

为甚么440C-Nb具有更宽的烧结窗？

在440C（1.0% C）烧结的进程中，当温度跨越固相线温度1285°C时，发生了以下共晶反映：

γ+ M7C3⇄液相

共晶反映致使刹时构成了7.5%的液相。跟着温度的降低液相的量不时增添：在1289°C时，液相的量为10.5%，在1294°C时到了12.6%。

绝对应，440C-Nb (1.2% C)系统中固相线温度为1281°C，只比440C低一点。当温度跨越固相线时，只要4%的液相构成，当温度持续降低到1294℃时，液相的量依然是4%（由于NbC的存在，大批的C被以NbC的情势牢固上去，γ + M7C3⇄液相共晶反映遭到按捺）。当温度降低到1350℃时，此时跨越液相线温度70℃，440C-Nb的液相含量依然低于440C。

这很好地诠释了440C烧结碰到的题目：在烧结炉中差别地位乃至统一整机差别地位轻细的温度变更发生的液相的量差别。而对440C-Nb液相的量更少，并且跟着温度的增添液相增添未几，是以如许的题目就很少呈现。

总而言之，这类新型的资料能够很好的充任MIM工艺中所须要的高硬度耐蚀机能强的资料。

注：固相线温：起头融入的温。

不锈钢粉末打针成形医疗整机




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