CN109692963B - 一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法 - Google Patents

一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法 Download PDF

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CN109692963B
CN109692963B CN201811546289.1A CN201811546289A CN109692963B CN 109692963 B CN109692963 B CN 109692963B CN 201811546289 A CN201811546289 A CN 201811546289A CN 109692963 B CN109692963 B CN 109692963B
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楼永华
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Ningbo Zhonghang Magnetic Materials Co ltd
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Abstract

本发明提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，所述钕铁硼磁体按重量份包括1‑3份石墨烯、1‑2份镍粉、1‑5份锌粉、10‑15份改性剂以及70‑90份钕铁硼粉末；所述改性剂为通式为Sr1‑xAxBi2Nb2O9，A为La、Ca、Ba、Na；0≤x≤0.03；所述耐腐蚀层按重量份包括70‑80份铝、10‑15份铜、1‑2份稀土以及0.1‑0.5份铋；本发明提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，不仅可以提高钕铁硼磁体的磁能积和矫顽力，还能提高钕铁硼的耐腐蚀能力。

Description

一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法
技术领域
本发明涉及钕铁硼领域，特别涉及一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法。
背景技术
钕铁硼磁体作为第三代稀土永磁材料，具有其他永磁材料无法比拟的优异的磁性能和高的性价比。因此，自发现以来，其得到了广泛的研究和迅猛的发展，已在计算机、通讯电子、汽车、航空等高技术领域得到广泛应用。随着磁性能的不断提高，其应用范围也在不断扩大，这也使其力学性能差的缺点逐渐凸显出来，成为限制其进一步应用的主要问题。因此，提高钕铁硼磁体的力学性能成为扩大其应用范围的重要基础。
另外由于钕铁硼磁体经常会在潮湿、高温以及电化学环境中使用，因此对其耐腐蚀性提出了更高的要求。
发明内容
本发明的目的是克服现有技术的不足，提供一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法。
为了实现上述目的，本发明提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，所述耐腐蚀钕铁硼磁体包括钕铁硼磁体和涂覆在钕铁硼磁体表面的耐腐蚀层，所述钕铁硼磁体按重量份包括1-3份石墨烯、1-2份镍粉、1-5份锌粉、10-15份改性剂以及70-90份钕铁硼粉末；所述改性剂为通式为Sr1-xAxBi2Nb2O9，A为La、Ca、Ba、Na；0≤x≤0.03；
所述耐腐蚀层按重量份包括70-80份铝、10-15份铜、1-2份稀土以及0.1-0.5份铋；
上述表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，包括以下步骤：
步骤一、改性体的制备，按照化学通式Sr1-xAxBi2Nb2O9中各组分的摩尔比，取原料SrCO3, Bi2O3, Nb2O5和A元素的碳酸化合物，然后将混合原料与溶剂按质量比1：1加入球磨罐进行球磨，接着将球磨料进行干燥并过100目的网筛得到颗粒均匀的干燥粉体，再将粉体在900℃空气中进行2-4小时预烧，球磨得到改性剂；
步骤二、钕铁硼磁体的制备，按重量份将1-3份石墨烯、1-2份镍粉、1-5份锌粉、10-15份改性剂以及70-90份钕铁硼粉末混合后放置在真空速凝炉里熔炼，浇注成厚度为0-0.6mm的金属薄片；接着在氢碎炉中氢破成1-200μm的颗粒；在气流磨中破碎成0-15μm的颗粒；然后进入成型压机，在2.0T磁场下成型，200T压力下静压；最后放入烧结炉中，于1000-1100℃烧结，800-1000℃一级回火，460-560℃二级回火；
步骤三、涂覆耐腐蚀层，采用阴极电泳沉积的方式将70-80份铝、10-15份铜、1-2份稀土以及0.1-0.5份铋沉积在钕铁硼磁体表面，并对涂覆好的磁体进行烧制处理即得耐腐蚀钕铁硼磁体。
在改性体的制备过程中球磨所用的球磨珠为氧化锆、氧化铈或氧化铝中的一种或几种。
在改性体的制备过程中球磨所用的溶剂为甲醇、乙醇、丙酮、去离子水的一种或者几种。
本发明提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，在钕铁硼粉末中添加石墨烯和镍粉，从而石墨烯与金属界面充分有效粘结，有效提高永磁材料的强度和导热性能。改性剂Sr1-xAxBi2Nb2O9可以提高钕铁硼磁体的磁能积和矫顽力，提高钕铁硼磁体的性能。另外在钕铁硼磁体的表面涂覆耐腐蚀层，则可以提高钕铁硼的耐腐蚀能力。
具体实施方式
实施例1
本实施例提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，所述耐腐蚀钕铁硼磁体包括钕铁硼磁体和涂覆在钕铁硼磁体表面的耐腐蚀层，所述钕铁硼磁体按重量份包括1份石墨烯、1份镍粉、1份锌粉、10份改性剂以及70份钕铁硼粉末；所述改性剂为Sr0.9La0.1Bi2Nb2O9，
所述耐腐蚀层按重量份包括70份铝、10份铜、1份稀土以及0.1份铋；
上述表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，包括以下步骤：
步骤一、改性体的制备，按照化学通式Sr0.9La0.1Bi2Nb2O9中各组分的摩尔比，取原料SrCO3, La2(CO3)3， Bi2O3, Nb2O5；然后将混合原料与溶剂按质量比1：1加入球磨罐进行球磨，接着将球磨料进行干燥并过100目的网筛得到颗粒均匀的干燥粉体，再将粉体在900℃空气中进行2-4小时预烧，球磨得到改性剂；
步骤二、钕铁硼磁体的制备，按重量份将1份石墨烯、1份镍粉、1份锌粉、10份改性剂以及70份钕铁硼粉末混合后放置在真空速凝炉里熔炼，浇注成厚度为0-0.6mm的金属薄片；接着在氢碎炉中氢破成1-200μm的颗粒；在气流磨中破碎成0-15μm的颗粒；然后进入成型压机，在2.0T磁场下成型，200T压力下静压；最后放入烧结炉中，于1000-1100℃烧结，800-1000℃一级回火，460-560℃二级回火；
步骤三、涂覆耐腐蚀层，采用阴极电泳沉积的方式将70份铝、10份铜、1份稀土以及0.1份铋沉积在钕铁硼磁体表面，并对涂覆好的磁体进行烧制处理即得耐腐蚀钕铁硼磁体。
在改性体的制备过程中球磨所用的球磨珠为氧化锆、氧化铈或氧化铝中的一种或几种。在改性体的制备过程中球磨所用的溶剂为甲醇、乙醇、丙酮、去离子水的一种或者几种。
实施例2
本实施例提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，其与实施例1的区别在于所述钕铁硼磁体按重量份包括3份石墨烯、2份镍粉、5份锌粉、15份改性剂以及90份钕铁硼粉末，所述改性剂为Sr0.9Ca0.1Bi2Nb2O9，原料为SrCO3, CaCO3， Bi2O3, Nb2O5。
实施例3
本实施例提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，其与实施例1的区别在于所述钕铁硼磁体按重量份包括2份石墨烯、2份镍粉、3份锌粉、11份改性剂以及80份钕铁硼粉末，所述改性剂为Sr0.8Ba0.2Bi2Nb2O9，原料为SrCO3, BaCO3， Bi2O3, Nb2O5。
实施例4
本实施例提供的一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，其与实施例1的区别在于所述耐腐蚀层按重量份包括80份铝、15份铜、2份稀土以及0.5份铋。

Claims (1)

1.一种表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，其特征在于，所述耐腐蚀钕铁硼磁体包括钕铁硼磁体和涂覆在钕铁硼磁体表面的耐腐蚀层，所述钕铁硼磁体按重量份包括1-3份石墨烯、1-2份镍粉、1-5份锌粉、10-15份改性剂以及70-90份钕铁硼粉末；所述改性剂为通式为Sr1-xAxBi2Nb2O9，A为La、Ca、Ba、Na；0≤x≤0.03；所述耐腐蚀层按重量份包括70-80份铝、10-15份铜、1-2份稀土以及0.1-0.5份铋；上述表面附有耐腐蚀涂层的钕铁硼磁体的制备方法，包括以下步骤：步骤一、改性体的制备，按照化学通式Sr1-xAxBi2Nb2O9中各组分的摩尔比，取原料SrCO3, Bi2O3, Nb2O5和A元素的碳酸化合物，然后将混合原料与溶剂按质量比1：1加入球磨罐进行球磨，接着将球磨料进行干燥并过100目的网筛得到颗粒均匀的干燥粉体，再将粉体在900℃空气中进行2-4小时预烧，球磨得到改性剂；步骤二、钕铁硼磁体的制备，按重量份将1-3份石墨烯、1-2份镍粉、1-5份锌粉、10-15份改性剂以及70-90份钕铁硼粉末混合后放置在真空速凝炉里熔炼，浇注成厚度为0-0.6mm的金属薄片；接着在氢碎炉中氢破成1-200μm的颗粒；在气流磨中破碎成0-15μm的颗粒；然后进入成型压机，在2.0T磁场下成型，200T压力下静压；最后放入烧结炉中，于1000-1100℃烧结，800-1000℃一级回火，460-560℃二级回火；步骤三、涂覆耐腐蚀层，采用阴极电泳沉积的方式将70-80份铝、10-15份铜、1-2份稀土以及0.1-0.5份铋沉积在钕铁硼磁体表面，并对涂覆好的磁体进行烧制处理即得耐腐蚀钕铁硼磁体；在改性体的制备过程中球磨所用的球磨珠为氧化锆、氧化铈或氧化铝中的一种或几种；在改性体的制备过程中球磨所用的溶剂为甲醇、乙醇、丙酮、去离子水的一种或者几种。
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