CN114635066B - 一种Al-Si-Fe系电机转子合金及其制备方法和应用 - Google Patents
一种Al-Si-Fe系电机转子合金及其制备方法和应用 Download PDFInfo
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Abstract
本申请公开了一种Al‑Si‑Fe系电机转子合金及其制备方法和应用,属于新能源汽车电机转子材料技术领域。一种Al‑Si‑Fe系电机转子合金,其特征在于,包括如下质量百分比的各组分:Si:0.2‑0.4%,Fe:0.1‑0.3%,IIA或IB族元素:0.2‑1%,余量为Al。该Al‑Si‑Fe系电机转子合金能够有效改善新能源汽车电机转子合金的高温蠕变性,同时具有优良的导电性能和力学性能。
Description
技术领域
本申请涉及一种Al-Si-Fe系电机转子合金及其制备方法和应用,属于新能源汽车电机转子材料技术领域。
背景技术
近年来汽车产业飞速发展,已经成为我国经济体系中重要的组成部分。新能源汽车在汽车产业的比重在不断增加,新能源汽车的大力发展对车用电机的功率和效率提出了更高的要求。
电机一般追求定位精度和力矩输出,效率比较低,电流一般比较大,且谐波成分高,电流交变的频率也随转速而变化,而转子普遍存在发热情况,长期在较高的环境下工作,就会造成转子低周期疲劳以及蠕变损耗,甚至可能引发安全性事故。
发明内容
为了解决上述问题,提供了一种Al-Si-Fe系电机转子合金及其制备方法和应用,有效改善新能源汽车电机转子合金的高温蠕变性,同时具有优良的导电性能和力学性能。
本发明采用的技术方案如下:
一种Al-Si-Fe系电机转子合金,包括如下质量百分比的各组分:Si:0.2-0.4%,Fe:0.1-0.3%,IIA或IB族元素:0.2-1%,余量为Al。
优选地,IIA族元素为Mg,IB族元素为Cu。
优选地,Cu在电机转子合金中的质量百分比为0.5-1%。
优选地,Mg在电机转子合金中的质量百分比为0.2-0.4%。
优选地,所述Al-Si-Fe系电机转子合金在200℃/17MPa服役1000h,蠕变应变量不高于0.20%。
根据本申请的另一个方面,一种如上述的Al-Si-Fe系电机转子合金的制备方法,包括以下步骤:
(1)按照Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于710-750℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Cu或Mg,采用六氯乙烷、氮气或氩气进行熔体精炼处理,精炼温度为720-740℃,处理时间10-30min;
(3)将熔体静置30min以上,在715-730℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,得到所述Al-Si-Fe系电机转子合金。
优选地,所述步骤(2)中六氯乙烷、氮气或氩气的添加量占熔体质量的0.5-1wt%。
优选地,所述步骤(4)的热处理步骤包括:将铸件加热至500-550℃,保温5-10h后进行水冷淬火,然后再将铸件加热至170-180℃,保温10-20h后空冷至室温。
优选地,所述铸件首次加热的升温速率为100-200℃/h,淬火转移时间<20s,再次加热的升温速率为100℃/h。
根据本申请的又一个方面,一种如上述的Al-Si-Fe系电机转子合金或制备方法制备得到的所述Al-Si-Fe系电机转子合金的应用,其适用于新能源汽车电机转子。
本申请的有益效果包括但不限于:
1.本申请的Al-Si-Fe系电机转子合金,IIA族元素为Mg加入0.2-0.4%,铝基体中主要形成β’-Mg2Si相和β-Al5FeSi相,IB族元素Cu加入0.5-1%,铝基体中主要形成θ’-Al2Cu相和β-Al5FeSi相,θ’-Al2Cu相、β’-Mg2Si相和β-Al5FeSi相的存在能够提高合金强度和导电性,显著改善合金的高温抗蠕变能力。
2.采用挤压铸造和热处理步骤获得的Al-Si-Fe系电机转子合金,在高温状况下有效地避免晶界的滑移,因而具有良好高温耐热抗蠕变性能;Al-Si-Fe系电机转子合金中各元素配比合理,均衡了各种性能,形成了稳定的晶体结构,耐热性能提高,高温尺寸稳定性能提高,且具有优异的力学性能和导电性能。
3.本申请的Al-Si-Fe系电机转子合金的热处理工艺,能够改变合金的组织结构,从而改变热激活运动的难易程度,提高Al-Si-Fe系电机转子合金的高温蠕变性能,工艺简单,操作性强,制备得到的Al-Si-Fe系电机转子合金的良品率高,各项性能优异。
4.本申请的Al-Si-Fe系电机转子合金,铸造过程中合金裂纹倾向一般,铸件孔隙率2%-6%,屈服强度73-80MPa、抗拉强度142-150MPa,电导率31.5-32.8MS/m;在200℃/17MPa服役1000h,蠕变应变量不高于0.20%,疲劳极限为20MPa,200℃保温100h的强度损失率<40%。
5.本申请的Al-Si-Fe系电机转子合金,兼有优良的高温蠕变性能、导电性能和力学性能,能够满足新能源汽车电机转子材料的需求,应用前景广阔,便于在工业生产中大规模推广应用。
具体实施方式
下面结合具体实施例对本发明作进一步说明,在此指出以下实施例不能理解为对本发明保护范围的限制,本领域普通技术人员根据本发明的内容作出一些简单的替换或调整,均在本发明的保护范围之内。
实施例1
一种Al-Si-Fe系电机转子合金,包括如下质量百分比的各组分:Si:0.4%,Fe:0.2%,Cu:0.5%,余量为Al。
该Al-Si-Fe系电机转子合金制备方法包括以下步骤:
(1)按照上述Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于710℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Cu元素,然后添加熔体质量1wt%六氯乙烷进行熔体精炼处理,精炼温度为720℃,处理时间30min;
(3)将熔体静置30min以上,在720℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,将铸件以100℃/h的升温速率加热至500℃,保温6h后进行水冷淬火,淬火转移时间<20s,然后再将铸件以100℃/h的升温速率加热至170℃,保温12h后空冷至室温,得到Al-Si-Fe系电机转子合金。
实施例2
一种Al-Si-Fe系电机转子合金,包括如下质量百分比的各组分:Si:0.2%,Fe:0.3%,Cu:0.8%,余量为Al。
该Al-Si-Fe系电机转子合金制备方法包括以下步骤:
(1)按照上述Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于740℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Cu元素,然后添加熔体质量0.5wt%氮气进行熔体精炼处理,精炼温度为730℃,处理时间20min;
(3)将熔体静置30min以上,在730℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,将铸件以200℃/h的升温速率加热至550℃,保温8h后进行水冷淬火,淬火转移时间<20s,然后再将铸件以100℃/h的升温速率加热至180℃,保温20h后空冷至室温,得到Al-Si-Fe系电机转子合金。
实施例3
一种Al-Si-Fe系电机转子合金,包括如下质量百分比的各组分:Si:0.4%,Fe:0.3%,Mg:0.2%,余量为Al。
该Al-Si-Fe系电机转子合金制备方法包括以下步骤:
(1)按照上述Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于750℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Mg元素,然后添加熔体质量0.8wt%氩气进行熔体精炼处理,精炼温度为740℃,处理时间20min;
(3)将熔体静置30min以上,在720℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,将铸件以100℃/h的升温速率加热至500℃,保温6h后进行水冷淬火,淬火转移时间<20s,然后再将铸件以100℃/h的升温速率加热至180℃,保温12h后空冷至室温,得到Al-Si-Fe系电机转子合金。
实施例4
一种Al-Si-Fe系电机转子合金,包括如下质量百分比的各组分:Si:0.3%,Fe:0.1%,Mg:0.3%,余量为Al。
该Al-Si-Fe系电机转子合金制备方法包括以下步骤:
(1)按照上述Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于720℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Mg元素,然后添加熔体质量0.7wt%氮气熔体精炼处理,精炼温度为720℃,处理时间30min;
(3)将熔体静置30min以上,在730℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,将铸件以200℃/h的升温速率加热至550℃,保温8h后进行水冷淬火,淬火转移时间<20s,然后再将铸件以100℃/h的升温速率加热至170℃,保温18h后空冷至室温,得到Al-Si-Fe系电机转子合金。
对比例1
与实施例1的区别在于:Al-Si-Fe系电机转子合金中未包括Cu。
对比例2
与实施例3的区别在于:将Mg:0.2%替换为Ca:1.0%。
对比例3
与实施例3的区别在于:步骤(2)中添加熔体质量2wt%氯化钠进行熔体精炼处理,精炼温度为800℃,处理时间5min。
对比例4
与实施例1的区别在于:步骤(3)中浇铸温度为700℃。
对比例5
与实施例4的区别在于:步骤(4)中将铸件以300℃/h的升温速率加热至600℃,保温3h后进行水冷淬火,淬火转移时间<20s,然后再将铸件以100℃/h的升温速率加热至300℃,保温5h后空冷至室温,得到Al-Si-Fe系电机转子合金。
测试例1
铸造过程中实施例1-4的合金裂纹倾向一般,铸件孔隙率2%-6%,对上述实施例1-4和对比例1-5的Al-Si-Fe系电机转子合金进行测试,电导率试样尺寸符合GB/T12966-2008要求并进行电导率测试,力学性能测试试样尺寸标准符合ASTM E8并进行拉伸性能分析,力学性能及电导率测试结果如表1所示:
表1
由表1可以看出,本申请的Al-Si-Fe系电机转子合金的力学性能和导电性能优异,抗拉强度不低于142MPa;屈服强度不低于73MPa;延伸率不低于46.2%;电导率不低于31.5MS/m;满足新能源汽车电机转子材料使用要求。
测试例2
实施例1-4的合金在200℃服役1000h变形量为0.2%的疲劳极限为20MPa,200℃保温100h的强度损失率<40%。将上述实施例1-4和对比例1-5的Al-Si-Fe系电机转子合金置于蠕变机里进行高温抗蠕变性能测试,测试条件为:蠕变温度200℃,服役时间为1000h,蠕变应力为17MPa,结果如表2所示。
表2
由表2可以看出,本申请Al-Si-Fe系电机转子合金具有比较好的高温抗蠕变性能,在200℃/17MPa,1000h的条件下,蠕变应变量不高于0.20%,稳态蠕变速率不高于5.462×10-8s-1。对比例1-5表明改变添加元素的种类、含量和顺序,以及制备工艺的参数,均在不同程度上降低了Al-Si-Fe系电机转子合金的高温抗蠕变性能。
以上所述,仅为本申请的实施例而已,本申请的保护范围并不受这些具体实施例的限制,而是由本申请的权利要求书来确定。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的技术思想和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。
Claims (4)
1.一种Al-Si-Fe系电机转子合金,其特征在于,包括如下质量百分比的各组分:Si:0.2-0.4%,Fe:0.1-0.3%,Cu:0.5-1%,余量为Al;
Al-Si-Fe系电机转子合金的制备方法,包括以下步骤:
(1)按照Al-Si-Fe系电机转子合金的组分配比,向熔炼炉中加入含硅料、含铁料和含铝料,并于710-750℃进行熔炼,得到熔化液;
(2)向步骤(1)熔化液中加入Cu,采用六氯乙烷、氮气或氩气进行熔体精炼处理,精炼温度为720-740℃,处理时间10-30min;
(3)将熔体静置30min以上,在715-730℃下进行浇铸,挤压铸造处理,得到铸件;
(4)将步骤(3)铸件进行热处理,得到所述Al-Si-Fe系电机转子合金;
所述步骤(4)的热处理步骤包括:将铸件加热至500-550℃,保温5-10h后进行水冷淬火,然后再将铸件加热至170-180℃,保温10-20h后空冷至室温;
所述铸件首次加热的升温速率为100-200℃/h,淬火转移时间<20s,再次加热的升温速率为100℃/h。
2.根据权利要求1所述的Al-Si-Fe系电机转子合金,其特征在于,所述Al-Si-Fe系电机转子合金在200℃/17MPa服役1000h,蠕变应变量不高于0.20%。
3.根据权利要求1所述的Al-Si-Fe系电机转子合金,其特征在于,所述步骤(2)中六氯乙烷、氮气或氩气的添加量占熔体质量的0.5-1wt%。
4.一种如权利要求1-3任一项所述的Al-Si-Fe系电机转子合金的应用,其特征在于,其适用于新能源汽车电机转子。
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