CN108384980B - 一种铜基纳米石墨复合材料的制备方法及其复合材料 - Google Patents
一种铜基纳米石墨复合材料的制备方法及其复合材料 Download PDFInfo
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Abstract
本发明公开了一种铜基纳米石墨复合材料的制备方法,包括如下步骤:S1、原料,骨料铜基为纯铜粉,粉料为纳米石墨粉;S2、雾化,将骨料通过电动力学雾化,其冷却速率达105‑106K/s,其平均粒度为0.1‑5μm;S3、脱脂,将雾化后的骨料和纳米石墨粉分别放入碱洗溶液中进行超声波作用脱脂,碱洗溶液温度通常为65‑75℃,浸泡5‑10min;S4、混料,将S2个S3处理后的骨料与粉料按照重量比为20:80‑25:75混合,并加入液态介质混合均匀;S7、一次烧结,将混合后的材料在通氩气防止其氧化的前提下进行烧结,温度为800‑950℃、烧结保温加压时间为10‑15min、烧结压强为50‑80MPa;S8、再次烧结,采用放电等离子烧结工艺得到的铜基纳米石墨复合材料。本发明还公开了通过上述方法制备的复合材料。
Description
技术领域
本发明涉及新型炭材料,特别是涉及一种铜基纳米石墨复合材料的制备方法及其复合材料。
背景技术
在受电弓滑板应用领域中,电力机车安全行使更是重中之重,受电弓滑板与弓网摩擦时,直接与接触网导线接触,同时在不同环境下行走,更是要求其材料必须具备良好的减磨性和自润滑性、导电性、抗冲击性以及耐腐蚀、耐电弧等性能。
铜-石墨复合材料同时兼备了铜基体的高强度、导电性、导热性、耐烧蚀性等优异性能,还具有石墨的耐腐蚀性、自润滑性以及电热导等性能,其综合性能更是电刷和电接触导电零部件的理想材料,其应用遍布于轨道交通、航天航空、军事、机械等领域。
在铜石墨电刷应用领域其以酚醛树脂为粘结剂,铜、铅、石墨等粉末为原料,混合后再进行制备。由于受石墨或配比影响,在混合的过程中存在严重的粉末分布不均匀现象,因此其性能又了改变,最终致使其某方面性能弱,在使用过程中出现一系列问题。
因此,申请人提出一种铜基纳米石墨复合材料的制备方法及其复合材料,其设备要求低、操作简便、增强体分散性好。
发明内容
有鉴于现有技术的上述缺陷,本发明所要解决的技术问题是提供一种铜基纳米石墨复合材料的制备方法及其复合材料。
为实现上述目的,本发明提供了一种铜基纳米石墨复合材料的制备方法,包括如下步骤:
S1、原料,骨料铜基为纯铜粉,粉料为纳米石墨粉;
所述纯铜粉的密度为8.92×103/cm3,电阻率为1.694*10-8Ω·m,纯度99.9%;
所述纳米石墨粉的粒度为50-100nm;
S2、雾化,将骨料通过电动力学雾化,其冷却速率达105-106K/s,其平均粒度为0.1-5μm;
S3、脱脂,将雾化后的骨料和纳米石墨粉分别放入碱洗溶液中进行超声波作用脱脂,碱洗溶液温度通常为65-75℃,浸泡5-10min;
S4、混料,将S2个S3处理后的骨料与粉料按照重量比为20:80-25:75混合均匀;混合通常采用湿混机械法,即骨料与粉料在混料机中以液体为介质进行均匀混合;优选地,所述液态介质为乙醇;
S7、一次烧结,将混合后的材料在通氩气防止其氧化的前提下进行烧结,温度为800-950℃、烧结保温加压时间为10-15min、烧结压强为50-80MPa;
S8、再次烧结,采用放电等离子烧结工艺得到的铜基纳米石墨复合材料,其分散性良好,同时样品结合情况良好,综合理化指标优异。
优选地,所述纯铜粉的密度为8.92×103/cm3,电阻率为1.694*10-8Ω·m,纯度99.9%;所述纳米石墨粉的粒度为50-100nm。
优选地,,所述液态介质为乙醇。
优选地,在S3中还加入有乳化剂,所述的乳化剂为NA2SIO3.5H2O。
优选地,S2中,雾化是将几千伏的额定电压施加到毛细管发射极内的液流表面上,利用建立的强电场在液流表面产生强大的抽力,以有效地克服液流的表面张力,使金属喷射成小液滴,带电液滴加速后飞向收集器,形成粉末。
一种铜基纳米石墨复合材料,其硬度为纯铜的3-5倍、耐腐蚀性为纳米石墨的1-2倍、体积密度10.0-15.0g/cm3、电阻率≤4.0μΩm、抗拉强度≥130Mpa、冲击韧性≥8J/cm2。
本发明的有益效果是:
1、本发明制备的铜基纳米石墨复合材料具有如下特性:
1)耐大工频和冲击电流冲击,电阻稳定、耐电弧性强。
2)耐腐蚀、无毒环保、使用寿命长、成本低。
2、采用所述工艺所制备的材料较为简单,利于大批量生产,原材料为市场广泛材料,成本低。
具体实施方式
下面结合实施例对本发明作进一步说明:
本发明通过对原料、配料、以及制备工艺进行了详细研究,制备的铜基纳米石墨复合材料体积密度10.0-15.0g/cm3、电阻率≤4.0μΩm、抗拉强度≥130Mpa、冲击韧性≥8J/cm2。
发明人经过多次实验,研究分析和产品试生产,在原料选择,以密度为8.92×103/cm3,电阻率为1.694*10-8Ω·m,纯度99.9%的纯铜为骨料;以粒度为50-100nm的纳米石墨为粉料。
再经过骨料的雾化、脱脂、混粉、一次烧结、再次烧结后得到的产品。
雾化,其工作原理是将几千伏的额定电压施加到毛细管发射极内的液流表面上,利用建立的强电场在液流表面产生强大的抽力,以有效地克服液流的表面张力,使金属喷射成小液滴,带电液滴加速后飞向收集器,形成粉末。其优点是制备的粉末纯度高,组织均匀,且工艺性能好;工艺流程时间短,设备简单。
脱脂,当铜粉末、纳米石墨放入碱洗溶液中,其表面的可皂化油直接与碱发生皂化反应,反应生成的服皂和甘油都能很好地溶解于水中,铜粉末和纳米石墨表面上的非皂化油则依靠乳化剂NA2SIO3.5H2O产生的乳化作用除去。乳化剂是一类表面活性齐,它在溶液中的分布是不均匀的,常常吸附在界面上,可降低油液界面张力,导致油与溶液的接触面积增大,使油膜变成小油滴分散在溶液中,从而使粉末表面上的非皂化油得以去除。
混粉,利用乙醇为湿混的液态介质既不与铜或纳米石墨发生化学反应,而且沸点又低、易挥发不会给混合后的粉料带来污染。
一次烧结是将铜基纳米在氩气保护气氛烧结炉中800-950℃烧结、烧结保温加压时间为10-15min、烧结压强为50-80MPa。
再烧结是将一次烧结后的材料进一步利用,放电等离子烧结工艺得到的铜基纳米石墨复合材料,经过再烧结的材料其分散性良好,同时样品结合情况良好,综合理化指标优异。
以上详细描述了本发明的较佳具体实施例。应当理解,本领域的普通技术人员无需创造性劳动就可以根据本发明的构思作出诸多修改和变化。因此,凡本技术领域中技术人员依本发明的构思在现有技术的基础上通过逻辑分析、推理或者有限的实验可以得到的技术方案,皆应在由权利要求书所确定的保护范围内。
Claims (6)
1.一种铜基纳米石墨复合材料的制备方法,其特征在于,包括如下步骤:
S1、原料,骨料铜基为纯铜粉,粉料为纳米石墨粉;
S2、雾化,将骨料通过电动力学雾化,其冷却速率达105-106K/s,其平均粒度为0.1-5μm;
S3、脱脂,将雾化后的骨料和纳米石墨粉分别放入碱洗溶液中进行超声波作用脱脂,碱洗溶液温度通常为65-75℃,浸泡5-10min;
S4、混料,将S2个S3处理后的骨料与粉料按照重量比为20:80-25:75混合,并加入液态介质混合均匀;
S7、一次烧结,将混合后的材料在通氩气防止其氧化的前提下进行烧结,温度为800-950℃、烧结保温加压时间为10-15min、烧结压强为50-80MPa;
S8、再次烧结,采用放电等离子烧结工艺得到的铜基纳米石墨复合材料。
2.如权利要求1所述的一种铜基纳米石墨复合材料的制备方法,其特征在于,所述纯铜粉的密度为8.92×103/cm3,电阻率为1.694*10-8Ω·m,纯度99.9%;所述纳米石墨粉的粒度为50-100nm。
3.如权利要求1所述的一种铜基纳米石墨复合材料的制备方法,其特征在于,所述液态介质为乙醇。
4.如权利要求1所述的一种铜基纳米石墨复合材料的制备方法,其特征在于,在S3中还加入有乳化剂,所述的乳化剂为Na2SiO3·5H2O。
5.如权利要求1所述的一种铜基纳米石墨复合材料的制备方法,其特征在于,S2中,雾化是将几千伏的额定电压施加到毛细管发射极内的液流表面上,利用建立的强电场在液流表面产生强大的抽力,以有效地克服液流的表面张力,使金属喷射成小液滴,带电液滴加速后飞向收集器,形成粉末。
6.一种采用权利要求1-5任一所述制备方法制备的铜基纳米石墨复合材料,其特征是:其硬度为纯铜的3-5倍、耐腐蚀性为纳米石墨的1-2倍、体积密度10.0-15.0g/cm3、电阻率≤4.0μΩm、抗拉强度≥130MPa 、冲击韧性≥8J/cm2。
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