CN1586791A - 点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法 - Google Patents
点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法 Download PDFInfo
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Abstract
本发明点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法含有重量百分比为12~ 24%的Ni,4~10%的Mo,0.15~1.0%的W,0.15~ 1.0%的Co,其余为TiB2。用本发明的TiB2熔敷棒采用表面电火花熔敷技术可以在点焊电极表面得到10~25μm的TiB2涂层,该涂层性能稳定。本发明的TiB2熔敷棒在采用点焊电极表面电火花熔敷工艺后得到的TiB2涂层不仅能有效提高点焊电极的寿命和抗粘附性能,而且实用性强。
Description
技术领域
一种点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法属于机械行业、微电子行业组装连接制造技术领域。
背景技术
随着汽车工业的发展,普通钢板已不能满足汽车耐蚀性能不断提高的要求。各种镀层钢板,特别是镀锌钢板在汽车上应用愈来愈广泛。由于点焊镀锌钢板时,低熔点的锌减小了电极与钢板之间的接触电阻,与点焊普通钢板(非镀层钢板)相比,需增大焊接电流或延长焊接时间才能保证焊接质量,这使得电极头部要承受更高焊接热,在焊接热和力联合作用下,易与钢板表面的低熔点的锌发生反应,形成低熔点的合金,加快电极失效。所以研究高性能的点焊电极材料和对现有的点焊电极进行表面处理来提高点焊电极寿命是焊接研究工作者努力的方向,但最经济最有效的方法还是对电极进行表面处理。若能在电极头部熔敷一层高熔点、高电导率、高强度且与锌结合力低的陶瓷材料,阻碍或减缓在点焊时电极与钢板表面的镀锌层发生反应,就能极大的提高电极寿命和提高电极和焊件之间的抗粘附性能。因此,为了适应点焊对点焊电极不断提高的要求,就需要研究更好的点焊电极表面处理材料。
对点焊电极表面处理的主要涂敷方法有电火花沉积和物理气相沉积。Gobez在点焊镀锌钢板的CrZrCu电极上分别沉积了钴、钽、镍、TiN和钼,结果表明前三种涂层使电极寿命降低而后两种涂层使电极的耐磨损性能略为增加。Wollongong大学的Studdon用TiN涂层电极点焊Zn-Al镀层钢,结果使CuCr电极的寿命增加了70%。Ashcroft等人用物理气相沉积技术之一的多弧技术在点焊电极表面沉积CrN涂层,用该电极点焊Zn-Al镀层钢,焊接电流比没有涂CrN电极的电流低10~12%,电极寿命也比没有涂CrN电极的寿命长,不过没有涂CrN电极的点焊电极表面寿命相对比较稳定,在±7%左右变化,而涂CrN电极的点焊电极表面寿命在±40%左右变化。波动较大原因是CrN涂层存在不少缺陷。加拿大Huys Industries Limited拥有的专利就报道了点焊电极表面电火花堆焊TiC层的工艺,此类电极在微型点焊镀镍钢板和镍板时,其电极寿命达到1200点是CuCrZr电极的两倍,提高电极寿命的主要原因是表面的TiC涂层阻碍了电极与镀镍板之间的局部焊接并且还减少了电极的塑性变形,此外,电极表面的TiC层还能提高电极的抗粘附性能;此类球型电极在点焊镀Zn汽车用钢板时的电极寿命达到1000余点,是CuCrZr电极的2.5倍,提高电极寿命的主要原因是TiC涂层延缓和阻止了Zn的扩散,延缓了与电极基体铜的合金化。
发明内容
本发明针对现有技术中存在的问题,提供一种导电性好,导热性好,熔点高的熔敷材料,本发明所涉及的点焊电极表面电火花熔敷涂层用的熔敷棒,其特征是:所述熔敷棒含有质量百分比为12~24%的Ni,4~10%的Mo,0.15~1.0%的W,0.15~1.0%的Co,其余为TiB2。使用所述含TiB2熔敷棒可以使点焊电极表面采用电火花熔敷工艺得到的TiB2涂层。
本发明提供了一种点焊电极表面电火花熔敷TiB2涂层用的TiB2熔敷棒的制备方法,其特征在于:将12~24%的Ni粉,4~10%的Mo粉,0.15~1.0%的W粉,0.15~1.0%的Co粉,其余为TiB2粉末(质量比)均匀混合后充分球磨;将球磨好的上述混合粉末添加总重量的(2~10)%的粘胶压制成所需要的棒材,棒材在100~300℃保温充分脱胶后在压力为100kg保护气氛中在1500~1900℃下烧结成材。
下面通过实例的试验数据以图表的形式说明本发明TiB2熔敷棒在点焊电极表面采用电火花熔敷工艺得到的TiB2涂层的性能,并与在传统的TiC熔敷棒在点焊电极表面采用电火花熔敷工艺得到的TiC涂层的性能进行比较。
表1是4种TiB2熔敷棒及传统TiC熔敷棒的成分表,表中组成均为重量百分比,表1中同时给出了熔敷一个直径为16mm头部半径为8mm的点焊球形电极所用的平均时间。从表1中可以看出,本发明实例1~4和TiC熔敷棒一样可以适用于点焊电极表面电火花熔敷的工艺。
表1
实例 | TiB2(%) | Ni(%) | Mo(%) | W(%) | Co(%) | 熔敷一个电极所用时间(s) |
对比例TiC棒 | 65 | |||||
实施例1 | 73.6 | 18.5 | 6.1 | 0.9 | 0.9 | 57 |
实施例2 | 75.6 | 18.4 | 4.2 | 1.0 | 0.8 | 59 |
实施例3 | 74.8 | 15.6 | 8.5 | 0.6 | 0.5 | 61 |
实施例4 | 75.7 | 16.2 | 7.1 | 0.7 | 0.3 | 56 |
表2是本发明实例1~4与传统TiC熔敷棒在点焊电极表面采用电火花熔敷工艺得到的TiB2涂层和TiC涂层在点焊厚度为0.8mm的镀锌钢板时的寿命比较。从表中可以看出,用本发明实例1~4在电极表面熔敷得到的TiB2涂层的寿命与传统TiC熔敷棒在电极表面熔敷得到的TiC涂层的寿命有所提高,适用于机械行业点焊镀锌钢板的连接。
表2
点焊厚度为0.8mm的镀锌钢板时的平均寿命 | |
对比例(TiC涂层) | 1000 |
实施例1 | 1400 |
实施例2 | 1500 |
实施例3 | 1550 |
实施例4 | 1450 |
表3是本发明实例1~4与传统TiC熔敷棒在点焊电极表面电火花熔敷得到的TiB2涂层和TiC涂层在微型点焊厚度为0.1mm的镀镍钢板时的寿命比较。从表中可以看出,用本发明实例1~4在电极表面熔敷得到的TiB2涂层的寿命与传统TiC熔敷棒在电极表面熔敷得到的TiC涂层的寿命相当或有所提高,适用于微电子行业微型点焊镀层板的连接。用本发明的TiB2熔敷棒在点焊电极表面采用电火花熔敷工艺可以得到TiB2涂层,该涂层成本低,一种导电性好,导热性好,熔点高能较大的延长电极寿命,优于传统TiC熔敷棒采用电火花熔敷工艺得到的TiC涂层。
表3
微型点焊厚度为0.1mm的镀镍钢板时的平均寿命 | |
对比例(TiC涂层) | 1200 |
实施例1 | 1300 |
实施例2 | 1400 |
实施例3 | 1250 |
实施例4 | 1300 |
附图说明:
图1为本发明TiB2熔敷棒的显微照片,中间的颗粒为TiB2颗粒;
图2为用本发明TiB2熔敷棒在点焊电极表面通过电火花熔敷工艺得到TiB2涂层的显微组织,中间的颗粒TiB2颗粒;
图3为用本发明TiB2熔敷棒在点焊电极表面通过电火花熔敷工艺得到TiB2涂层的剖面电镜照片
图4为图3相应位置Ti元素的面扫描。
具体实施方式
例1:将736克TiB2粉末、185克的Ni粉,61克的Mo粉,9克的W粉和9克Co粉均匀混合后球磨52小时,将球磨好的上述混合粉末加83克的粘胶压制成所需要的棒材,棒材在220℃脱胶后在压力为100kg的Ar保护气氛中在1710℃下烧结成材待用。
例2:将756克TiB2粉末、184克的Ni粉,42克的Mo粉,10克的W粉和8克Co粉均匀混合后球磨60小时,将球磨好的上述混合粉末加75克的粘胶压制成所需要的棒材,棒材在270℃脱胶后在压力为100kg Ar保护气氛中在1780℃下烧结成材待用。
例3:将748克TiB2粉末、156克的Ni粉,85克的Mo粉,6克的W粉和5克Co粉均匀混合后球磨52小时,将球磨好的上述混合粉末加91克的粘胶压制成所需要的棒材,棒材在190℃脱胶后在压力为100kg的Ar保护气氛中在1680℃下烧结成材待用。
例4:将757克TiB2粉末、162克的Ni粉,71克的Mo粉,7克的W粉和3克Co粉均匀混合后球磨52小时,将球磨好的上述混合粉末加86克的粘胶压制成所需要的棒材,棒材在280℃脱胶后在压力为100kg的Ar保护气氛中在1750℃下烧结成材待用。
如附图所述:图1、2是本发明TiB2熔敷棒和用本发明TiB2熔敷棒在点焊电极表面通过电火花熔敷工艺得到TiB2涂层的显微组织图。图3、4是用本发明TiB2熔敷棒在点焊电极表面通过电火花熔敷工艺得到TiB2涂层的剖面电镜照片和相应位置Ti元素的面扫描。
Claims (3)
1、点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法,所述熔敷棒其特征在于:所述熔敷棒含有质量百分比为12%~24%的Ni,4%~10%的Mo,0.15%~1.0%的W,0.15%~1.0%的Co,其余为TiB2;点焊电极表面电火花熔敷涂层用的熔敷棒的制备方法,其特征在于,它包括以下步骤:先将12%~24%的Ni粉,4%~10%的Mo粉,0.15%~1.0%的W粉,0.15%~1.0%的Co粉,其余为TiB2粉末(质量比)均匀混合后充分球磨;然后将球磨好的上述混合粉末中添加总质量的2%~10%的粘胶压制成所需要的棒材,棒材在100℃~300℃保温充分脱胶后在压力为100kg保护气氛中在1500℃~1900℃下烧结成材。
2、根据权利要求书1所述的点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法的熔敷棒含有的质量百分比,其特征在于:含Ni最佳量为15%~20%,含Mo最佳量为4%~8.5%,含W最佳量为0.5%~1.0%,含Co最佳量为0.3%~1.0%,其余为TiB2。
3、根据权利要求书1所述的点焊电极表面电火花熔敷涂层用的熔敷棒及其制备方法的制备方法,其特征在于:最佳球磨时间范围是48~72小时;在压力为100kg保护气氛中最佳温度范围是1650℃~1800℃下烧结成材。
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-
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-
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CN101018642B (zh) * | 2005-05-17 | 2012-11-07 | 哈伊斯工业有限公司 | 焊接电极 |
CN100445016C (zh) * | 2005-11-30 | 2008-12-24 | 陈铮 | 一种电阻焊铜合金电极及其制造方法 |
CN102618867A (zh) * | 2012-03-19 | 2012-08-01 | 湖南三泰新材料股份有限公司 | 轧辊表面TiC/TiB2基金属陶瓷复合强化方法 |
CN103805988A (zh) * | 2013-12-16 | 2014-05-21 | 湖北工业大学 | 电火花熔覆涂层用的TiB2-ZrB2复相熔覆棒及其制备方法 |
CN103801851A (zh) * | 2013-12-16 | 2014-05-21 | 湖北工业大学 | 点焊电极表面电火花熔敷Al2O3-TiB2涂层用的熔敷棒及其制备方法 |
CN103801858A (zh) * | 2013-12-16 | 2014-05-21 | 湖北工业大学 | 点焊电极表面电火花熔敷TiB2-TiC复相涂层用的熔敷棒其制备方法 |
CN103805988B (zh) * | 2013-12-16 | 2016-02-10 | 湖北工业大学 | 电火花熔覆涂层用的TiB2-ZrB2复相熔覆棒及其制备方法 |
CN103801851B (zh) * | 2013-12-16 | 2016-04-06 | 湖北工业大学 | 点焊电极表面电火花熔敷Al2O3-TiB2涂层用的熔敷棒及其制备方法 |
CN103801858B (zh) * | 2013-12-16 | 2016-06-08 | 湖北工业大学 | 点焊电极表面电火花熔敷TiB2-TiC涂层用的熔敷棒 |
Also Published As
Publication number | Publication date |
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CN100349687C (zh) | 2007-11-21 |
CA2510911A1 (en) | 2006-02-08 |
US20060029512A1 (en) | 2006-02-09 |
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