CN109099082A - 一种刹车片涂层 - Google Patents
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
- C09D161/14—Modified phenol-aldehyde condensates
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
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Abstract
本发明涉及车辆的制动技术领域,具体地说是一种刹车片涂层,其特征在于包括涂层配方体系的构成及制备方法,按重量百分比,它是以10‑20%硼酸铝晶须为增强材料,以12‑25%液体树脂作粘结剂,再加40‑60%其它功能性填料而制成的。与没有涂层刹车片性能相比,本发明技术改善了刹车片表面与有沟槽的刹车盘不能完全贴合,相互摩擦会产生制动效力不足、刹车有噪音的缺陷,所制得的涂层耐磨性好、寿命长,粘附力强,摩擦系数有明显提高且制动平稳,因而缩短了初始磨合期,提高了制动效力,而且降低了制动噪音。
Description
]技术领域
本发明涉及车辆的制动技术领域,具体地说是一种刹车片涂层。
背景技术
随着刹车片和刹车盘的不断摩擦,刹车盘表面会出现凹凸不平的磨痕,当更换一套新的刹车片时,齐平的刹车片表面与凹凸不平的刹车盘就不能完全贴合,相互摩擦时就会产生一个制动效力不足现象,容易产生安全隐患。只有经过一段时间的磨合,制动效力才会不断增加,这一时期我们称之为初始磨合期。
为了提高初始磨合期刹车制动效力,我们研究一种涂层技术,也就是在刹车片衬片表面涂一层覆膜,这个涂层覆膜的作用就是提高初始制动力,其原理就是这个涂层上制造了凹凸点,在扫描电镜上可以清楚地观察出涂层的微观结构,这样就缩短了初始磨合期,提高制动效力。
近年来,我国汽车保有量迅速增加,2017全国汽车保有量2.17亿辆,全国每年需求刹车片8亿片左右,据统计全世界刹车片需求量在70亿片以上,因此国内、国际市场需求量巨大。通常,对于刹车片的摩擦对偶刹车盘而言,每一套刹车盘约消耗3套刹车片。而人们对刹车片的性能要求越来越高,特别是对刹车片初始磨合期制动效力的认识也越来越重视,所以刹车片涂层技术应用已经得到国内外市场的广泛认可,具有广阔的市场前景。
发明内容[0003]
本发明的目的在于:提供一种刹车片涂层。本发明针对刹车片在初始磨合期中出现的制动效力不强的现状,开发了一种由硼酸铝晶须为增强材料,液体树脂做粘结剂,氧化铝、氧化锆为摩阻材料,及其它功能性填料而的涂层制备技术,避免了刹车片初始磨合期贴合不好,导致制动效能小、刹车有噪音的诸多不足,提高了刹车片综合性能。
本发明采用的技术措施是:
一种刹车片涂层的配方构成:按重量百分比计算,它是以10-20%硼酸铝晶须为增强材料,以12-25%液体丁腈改性酚醛树脂为粘结剂,再加40-60%功能性填料而制成的。
准确地说,功能性填料中各组份在摩擦材料中所占重量百分比为:12%氧化铝、6%氧化锆、5%二硫化钼、8%人造石墨、5%摩擦粉、24%硫酸钡。
所述硼酸铝晶须属正交晶系结构,与氧化铝晶体结构相似,具有优良的机械强度,耐热耐腐蚀,可作为酚醛树脂很好的补强剂。
所述氧化铝是气相纳米α-Al2O3,气相纳米α-Al2O3能够赋予硼酸铝晶须快速吸附和良好的附着性,增强涂层与刹车片粘附力;且由于其自身带正电荷,涂层具有优异的流动性,便于涂刷和改善摩擦带电性能。
所述涂层制备包括以下步骤:
步骤I混料:称取硼酸铝晶须放入搅拌机中,在1250rpm转速下搅拌3分钟,然后先后加入氧化铝和液体树脂在120rpm转速下搅拌5-6分钟,最后加入功能性填料在120rpm转速下搅拌8-10分钟;
步骤Ⅱ刷涂:将混合好的原料均匀涂在刹车片表面上,涂层厚度≤0.1mm;
步骤Ⅲ固化干燥:将涂层刹车片放入隧道式固化炉中,固化时间45分钟,温度180℃。
与没有涂层刹车片相比,本发明技术改善了刹车片表面与有沟槽的刹车盘不能完全贴合,相互摩擦会产生制动效力不足、刹车有噪音的缺陷,所制得的涂层耐磨性好、寿命长,粘附力强,摩擦系数μ可由0.25提高到0.35以上,且制动平稳,因而缩短了初始磨合期,提高了制动效力,而且降低了制动噪音。
具体实施方式:
实施例1:涂层配方中不同含量的硼酸铝晶须的效能实验对比:
图1涂层中不同含量硼酸铝晶须在不同压力下的摩擦系数变化。从图1中可看出,涂层配方中不同含量的硼酸铝晶须其摩擦系数的波动变化是不同的,其中硼酸铝晶须的含量为15%时,其摩擦系数较高(达到0.35)且曲线平稳,说明制动效能高且稳定。
因此硼酸铝晶须的含量为15%是比较适宜的。
实施例2:涂层配方中不同含量的氧化铝的效能实验对比,参见图2:涂层中不同含量氧化铝在不同压力下的摩擦系数变化;
从图2中可看出,涂层配方中不同含量的氧化铝其摩擦系数的波动变化是不同的,其中氧化铝的含量为12%时,其摩擦系数较高(达到0.35以上)且曲线平稳,说明制动效能高且稳定。
因此氧化铝的含量为12%时,效果最佳。
实施例3:无涂层和有涂层刹车片的效能实验对比,参见图3:有无涂层刹车片在不同制动次数下的摩擦系数变化;
从图3中可看出,有涂层刹车片起始摩擦系数就达到0.3,μ最高达到0.38,比没有涂层的摩擦系数明显高且平稳;没有涂层的刹车片摩擦系数在刹车次数达到50次时,μ才能达到0.3,甚至需要刹车70-80次才能达到;由此可见,涂层大大缩短了刹车片的初始磨合期,提高了制动效力。
实施例4:涂层粘附力测试(划格1*1mm胶带测试),参见图4:使用胶带检测涂层粘附力情况;
从图4中可看出,对刹车片上涂层进行划格(1*1mm),然后贴上3M600胶带,然后慢慢揭下胶带,胶带上无任何涂层粘附物,说明涂层有足够的粘附力。
Claims (3)
1.一种刹车片涂层,其特征在于:该涂层组分包括:按重量百分比,增强材料10-20%、功能性填料40-60%、粘结剂12-25%,三种组分之和为100%;其中增强材料为硼酸铝晶须,功能性填料包括重量比例依次为12:6:5:8:5:24的氧化铝、氧化锆、二硫化钼、人造石墨、摩擦粉、硫酸钡,粘结剂为液体丁腈改性酚醛树脂。
2.根据权利要求1所述一种刹车片涂层,其特征在于所述涂层制备包括以下步骤:
步骤I混料:称取硼酸铝晶须放入搅拌机中,在1250rpm转速下搅拌3分钟,然后分别加入氧化铝和液体树脂在120rpm转速下搅拌5-6分钟,最后加入其它功能性填料在120rpm转速下搅拌8-10分钟;
步骤Ⅱ刷涂:将混合好的原料均匀涂在刹车片表面上,涂层厚度≤0.1mm;
步骤Ⅲ固化干燥:将涂层刹车片放入隧道式固化炉中,固化时间45分钟,温度180℃。
3.根据权利要求1所述的一种刹车片涂层,其特征在于:所述氧化铝是气相纳米α-Al2O3,气相纳米α-Al2O3能够赋予硼酸铝晶须快速吸附和良好的附着性,增强涂层与刹车片表面粘附力;且由于其自身带正电荷,使涂层具有优异的流动性,便于涂刷和改善摩擦带电性能。
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CN110903731A (zh) * | 2019-10-17 | 2020-03-24 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
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CN104482087A (zh) * | 2014-12-11 | 2015-04-01 | 烟台孚瑞克森汽车部件有限公司 | 一种刹车片涂层用免烧蚀摩擦涂料及其制备方法 |
CN104482087B (zh) * | 2014-12-11 | 2017-02-01 | 烟台孚瑞克森汽车部件有限公司 | 一种刹车片涂层用免烧蚀摩擦涂料及其制备方法 |
CN105402292A (zh) * | 2015-12-16 | 2016-03-16 | 上海理工大学 | 一种汽车刹车片及其制备方法 |
CN106147124A (zh) * | 2016-06-29 | 2016-11-23 | 芜湖德业摩擦材料有限公司 | 一种重载汽车刹车片用摩擦材料 |
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CN110903731A (zh) * | 2019-10-17 | 2020-03-24 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
CN110903731B (zh) * | 2019-10-17 | 2021-09-28 | 山东金麒麟股份有限公司 | 一种刹车片用免烧蚀剂、制备和应用方法及其刹车片 |
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