CN106636950A - 一种耐湿耐氧化电磁波吸收剂 - Google Patents
一种耐湿耐氧化电磁波吸收剂 Download PDFInfo
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Abstract
本发明公开了一种耐湿耐氧化电磁波吸收剂,其特征在于其化学成分及质量百分含量分别为:Cr,14%~20%;Mo,0.5%~1.5%;Mn,0.1%~2%;Fe,76.5%~85.4%。该电磁波吸收剂粒度小于等于100微米,可以采用气雾化、水雾化或高能球磨方法中的一种制备。采用气雾化和水雾化方法制备的吸收剂呈球状;采用高能球磨方法制备的吸收剂呈片状。本发明所提出的耐湿耐氧化电磁波吸收剂,不仅具有良好的耐湿耐氧化性能,同时具有优异的电磁波吸收性能,可采用多种方法制备,工艺简单。
Description
技术领域
本发明涉及电磁波吸收剂和电磁波吸收材料的研究领域,公开了一种耐湿耐氧化电磁波吸收剂。
背景技术
随着科技的进步,电子化、信息化技术的应用得到迅速发展,各种现代电子设备如无线电广播、电视、手机等快速普及,由电子设备产生的电磁辐射所带来的信息泄露、损害健康和电磁干扰等问题日益显现。电磁波吸收材料在解决这一问题中起到了关键作用。
电磁波吸收材料通常是由无机吸收剂与塑料、橡胶、胶粘剂、涂料等高分子有机基体组成,高分子基体是吸收剂的载体,吸收剂提供了电磁波吸收所需要的电磁性能,是决定吸波性能优劣的关键组分。电磁波吸收剂按损耗机理分为两类:(1)介电损耗类吸收剂,如炭黑、碳纤维、石墨和SiC纤维等;(2)磁损耗类吸收剂,如铁氧体、羰基铁粉和其他磁性金属微粉等。介电损耗类吸收材料厚度大,吸收频带窄,性能相对较差;而磁性吸收剂由于具有高的磁导率和磁损耗,吸波频带宽且厚度薄。中国专利CN1923413对磁性吸收剂表面包裹了一层高电阻率的包覆膜,降低了其介电常数;中国专利CN1292632C提供了一种包括软磁材料的扁平粉末和粘结材料的电磁波吸收剂;中国专利CN101328534采用熔体快淬工艺、高能球磨处理工艺和真空热处理工艺制备了薄片状纳米晶微波吸收剂,具有较高微波磁导率和磁损耗。已有公开文献中的金属吸收剂虽然具有优异的电磁性能,但其耐湿和耐氧化等性能并不能满足某些特殊场合的使用要求。
发明人在经过大量研究和实验后发现:在纯铁吸收剂中引入Cr、Mo和Mn等元素可以有效提高其耐湿和耐氧化等性能,同时保持较好的吸波性能。基于上述发现完成本发明。
发明内容
本发明的目的是克服现有技术的不足,提供一种耐湿耐氧化电磁波吸收剂。
本发明解决技术问题采用的技术方案是:
耐湿耐氧化电磁波吸收剂,具有以下的化学成分及质量百分含量:Cr,14%~20%;Mo,0.5%~1.5%;Mn,0.1%~2%;Fe,76.5%~85.4%。
所述耐湿耐氧化电磁波吸收剂可以是块状或粉状Cr、Mo、Mn和Fe等原料经真空熔炼后,采用气雾化或水雾化方法制备;也可以是将粉末状Cr、Mo、Mn和Fe等原料置于惰性气氛保护的球磨罐中,采用高能球磨法制备。
所述耐湿耐氧化电磁波吸收剂经筛分或分级机,控制其粒度小于等于100微米。
所述耐湿耐氧化电磁波吸收剂,采用气雾化和水雾化方法制备的产品呈球状,吸收剂粉体典型的扫描电镜照片分别见图1和图2;采用高能球磨方法制备的产品呈片状,吸收剂粉体典型扫描电镜照片见图3。
本发明与现有技术相比具有以下优点:
(1)本发明所提出的耐湿耐氧化电磁波吸收剂,不仅具有良好的耐湿耐氧化性能,同时具有优异的电磁波吸收性能。
(2)本发明所提出的耐湿耐氧化电磁波吸收剂可采用多种方法制备,工艺简单。
附图说明
图1为实施例1所制备耐湿耐氧化电磁波吸收剂典型的SEM照片;
图2为实施例2所制备耐湿耐氧化电磁波吸收剂典型的SEM照片;
图3为实施例3所制备耐湿耐氧化电磁波吸收剂典型的SEM照片;
图4为实施例1制备耐湿耐氧化电磁波吸收剂与硅橡胶所形成的吸波材料的反射率曲线;
图5为实施例2制备耐湿耐氧化电磁波吸收剂与硅橡胶所形成的吸波材料的反射率曲线;
图6为实施例3制备耐湿耐氧化电磁波吸收剂与硅橡胶所形成的吸波材料的反射率曲线。
具体实施方式
以下是本发明的具体实施案例,注意这些案例仅用于说明本发明而不用于限制本发明的范围。
实施例1:
采用气雾化法制备球状耐湿耐氧化电磁波吸收剂,控制其化学成分及质量百分含量为Cr,14%;Mo,0.5%;Mn,0.1%;Fe,85.4%。经筛分控制吸收剂粒度小于100微米。
将吸收剂在相对湿度95%、温度100℃的环境中湿热氧化24h,按照吸收剂的体积分数为20%制备2.0mm厚硅橡胶基吸波材料,测量其在6-18GHz时的电磁参数和反射率,见图4。该材料在13-18GHz范围内反射率均小于-8dB,在13.9-18GHz范围内反射率均小于-10dB。
实施例2
采用水雾化制备球状耐湿耐氧化电磁波吸收剂,控制其化学成分及质量百分含量:Cr,20%;Mo,1.5%;Mn,2%;Fe,76.5%。经分级机控制吸收剂粒度小于100微米。
将吸收剂在相对湿度95%、温度100℃的环境中湿热氧化24h,按照吸收剂的体积分数为30%制备1.7mm厚硅橡胶基吸波材料,测量其在6-18GHz时的电磁参数和反射率,见图5。该材料在11.2-18GHz范围内反射率均小于-8dB,在12.2-18GHz范围内反射率均小于-10dB。
实施例3:
采用高能球磨法制备片状耐湿耐氧化电磁波吸收剂,控制其化学成分及质量百分含量:Cr,17%;Mo,1.25%;Mn,1%;Fe,80.75%。经筛分控制吸收剂粒度小于100微米。
将吸收剂在相对湿度95%、温度100℃的环境中湿热氧化24h,按照吸收剂的体积分数为30%制备2.0mm厚硅橡胶基吸波材料,测量其在6-18GHz时的电磁参数和反射率,见图6。该材料在8.6-15.9GHz范围内反射率均小于-8dB,在9.9-14.9GHz范围内反射率均小于-10dB。
Claims (6)
1.一种耐湿耐氧化电磁波吸收剂,其特征在于其化学成分及质量百分含量分别为:Cr,14%~20%;Mo,0.5%~1.5%;Mn,0.1%~2%;Fe,76.5%~85.4%。
2.根据权利要求1所述的耐湿耐氧化电磁波吸收剂,其特征在于其粒度小于等于100微米。
3.根据权利要求1所述的耐湿耐氧化电磁波吸收剂,其特征在于该电磁波吸收剂的是通过气雾化、水雾化或高能球磨方法制得。
4.根据权利要求1所述的耐湿耐氧化电磁波吸收剂,其特征在于所述耐湿耐氧化电磁波吸收剂呈球状或片状。
5.根据权利要求4所述的耐湿耐氧化电磁波吸收剂,其特征在于,所述球状耐湿耐氧化电磁波吸收剂是采用气雾化或水雾化制备得到。
6.根据权利要求4所述的耐湿耐氧化电磁波吸收剂,其特征在于,所述片状耐湿耐氧化电磁波吸收剂是采用高能球磨法制备得到。
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CN102605262A (zh) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | 一种铁素体不锈钢及其制造方法 |
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CN105448452A (zh) * | 2014-09-19 | 2016-03-30 | 株式会社东芝 | 复合磁性材料的制造方法 |
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Patent Citations (9)
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JPH0770716A (ja) * | 1993-06-30 | 1995-03-14 | Aichi Steel Works Ltd | 冷鍛性、耐食性、溶接性に優れた軟磁性ステンレス鋼 |
JPH08127801A (ja) * | 1994-11-01 | 1996-05-21 | Mitsubishi Steel Mfg Co Ltd | 磁気センサーローター製造用粉末および磁気センサーローターの製造方法 |
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CN103173683A (zh) * | 2013-03-29 | 2013-06-26 | 电子科技大学 | 一种合金微粉电磁波吸收剂及其制备方法 |
CN105448452A (zh) * | 2014-09-19 | 2016-03-30 | 株式会社东芝 | 复合磁性材料的制造方法 |
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