CN108239767B - 一种轮胎模具内表面自润滑涂层的制备方法 - Google Patents

一种轮胎模具内表面自润滑涂层的制备方法 Download PDF

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CN108239767B
CN108239767B CN201711078627.9A CN201711078627A CN108239767B CN 108239767 B CN108239767 B CN 108239767B CN 201711078627 A CN201711078627 A CN 201711078627A CN 108239767 B CN108239767 B CN 108239767B
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tire mold
base material
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coating
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CN108239767A (zh
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魏修亭
董传贺
李志永
王�锋
王永琪
王志晓
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Shandong University of Technology
Shandong Linglong Tyre Co Ltd
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Abstract

本发明公开了一种轮胎模具内表面自润滑涂层的制备方法，该自润滑涂层轮胎模具包括轮胎模具基材，所述轮胎模具基材上依次涂覆有Cr层、WC层和F‑DLC层；该润滑涂层及其制备工艺是在轮胎模具基材表面上，制备具有多层复合纳米涂层，该涂层具有优异的自润滑性、高硬度、优良的摩擦性能。

Description

一种轮胎模具内表面自润滑涂层的制备方法
技术领域
本发明属于模具涂层材料技术领域，涉及一种在轮胎模具花纹块内表面制备自润滑F-DLC涂层的方法。
背景技术
轮胎加工过程中轮胎模具内表面极易因橡胶的流动阻力产生粘胶、积碳、脱模难等问题，使轮胎的质量与外观均受到不利影响。
目前轮胎行业普遍采用在轮胎模具花纹块内表面涂覆Teflon涂层，来解决这一难题。然而Teflon涂层硬度低、耐磨性差，易因划痕、磨损影响表面光洁度而失效，服役寿命短，易引发环境污染和危害人体健康；类金刚石（DLC）涂层轮胎模具，具有高硬度、高耐磨性、高腐蚀性，但内应力高、附着力差、摩擦系数高于Teflon涂层。
发明内容
为了克服上述缺陷，本发明提供了一种轮胎模具内表面自润滑涂层的制备方法，其是在轮胎模具内表面上，制备具有多层复合结构和自润滑功能的纳米涂层，该纳米涂层具有高硬度、高附着力和耐腐蚀性。
本发明为了解决其技术问题所采用的技术方案是：一种自润滑涂层轮胎模具，包括轮胎模具基材，所述轮胎模具基材上依次涂覆有Cr 层、WC 层和F-DLC 层。
作为发明的进一步改进，所述Cr层厚度为0.3-0.6µm，所述WC层厚度为0.5-0.8µm，所述F-DLC层厚度为1.5-1.8µm。
作为发明的进一步改进，所述Cr层、WC层和F-DLC层表面粗糙度Ra为10-20nm，水接触角为90º-110º，乙醇接触角为20º-30º，表面能为18-20mN/m，纳米硬度为14-16GPa，摩擦系数为0.15-0.25。
本发明还提供一种如上述的轮胎模具自润滑涂层的制备方法，包括以下步骤：
1）预处理：对轮胎模具基材表面进行打磨抛光处理，然后将轮胎模具基材依次侵入丙酮、酒精中进行超声清洗，吹干。
2）溅射清洗：将吹干后的轮胎模具基材置于镀膜室内的工件旋转支架上，对反应室进行抽真空，后通入氩气，保持真空度5×10-4-7×10-4Pa，偏压为-10—-20KV，占空比25%-45%，溅射时间20-30min。
3）沉积Cr打底层：溅射清洗后，利用靶材Cr在轮胎模具基材表面沉积Cr打底层，调节功率6-8KW，沉积时间20-30min。
4）沉积WC过渡层：沉积Cr打底层后，利用靶材WC在Cr打底层上沉积WC层，调节功率6-8KW，沉积时间50-60min。
5）沉积F-DLC涂层：沉积WC过渡层后，通入CH4，CF4，气流比例3.0-5.0，保持真空度5×10-4-7×10-4Pa，偏压为-700--900V，沉积时间100-120min，在轮胎模具基材表面获得F-DLC涂层。
所述的轮胎模具基材为45#钢基材。
本发明的有益效果是：通过在轮胎模具表面制备出自清洁性好、附着力优异、低摩擦、高硬度、耐腐蚀的多层功能性涂层，有效解决轮胎硫化过程中易粘胶、积碳、脱模难和污染的问题。
附图说明
图1 为本发明剖面结构示意图；
其中：1、45#钢基体，2、金属打底层Cr层，3、金属过渡层WC层，4、F-DLC涂层；
图2 为本发明所述自润滑涂层轮胎模具样品测试的压入深度-纳米硬度曲线图；
图3 为本发明所述自润滑涂层轮胎模具样品测试的摩擦时间-摩擦系数曲线图。
具体实施方式
结合附图，对本发明作详细说明，但本发明的保护范围不限于下述实施例。
一种自润滑涂层，包括45#钢基材1，所述轮胎模具基材上依次涂覆Cr 层2，WC 层3，F-DLC层4。
所述Cr层2，厚度为0.3-0.6µm，所述WC层3，厚度为0.5-0.8µm，所述F-DLC层4，厚度为1.5-1.8µm。
所述Cr层2、WC层3和F-DLC层4表面粗糙度Ra为10-20nm，水接触角为90º-110º，乙醇接触角为20º-30º，表面能为18-20mN/m，纳米硬度为14-16GPa，摩擦系数为0.15-0.25。
一种如上述的轮胎模具内表面自润滑涂层的制备方法，包括以下步骤：
1）预处理：对45#钢基材1，表面进行打磨抛光处理，使其粗糙度降至20nm以下，之后将45#钢基材1，依次侵入丙酮、乙醇中超声清洗，吹干。
2）溅射清洗：将吹干后的45#钢基材1，置于镀膜室内的工件旋转支架上，对反应室进行抽真空，后通入氩气，保持真空度5×10-4-7×10-4Pa，偏压为-10—-20KV，占空比25%-45%，溅射时间20-30min。
3）沉积Cr打底层2：溅射清洗后，利用靶材Cr在轮胎模具基材表面沉积Cr打底层2，调节功率6-8KW，沉积时间20-30min。
4）沉积WC过渡层3：沉积Cr打底层2后，利用靶材WC在Cr打底层2上沉积WC层3，调节功率6-8KW，沉积时间50-60min。
5）沉积F-DLC涂层4：沉积WC过渡层3后，通入CH4，CF4，气流比例3.0-5.0，保持真空度5×10-4-7×10-4Pa，偏压为-700--900V，沉积时间100-120min，在轮胎模具基材表面获得F-DLC涂层4。
通过日本理学ZSX-100e型X射线荧光光谱仪测量涂层的表面元素，得F-DLC涂层4的F含量约为22mass%。
通过LabRAM XPLORA型Raman光谱仪对涂层进行分析，可知F-DLC涂层4具有较高sp3键占比。
通过XP型纳米压痕仪对涂层进行纳米硬度分析，得出F-DLC涂层4的纳米硬度值为15GPa。
通过OCA15EC型接触角测量仪对涂层进行接触角分析，得出F-DLC涂层4水接触角为90º-110º，乙醇接触角为20º-30º，表面能为18-20mN/m。
通过MMU-10G型端面摩擦磨损试验机测量涂层相对于橡胶的摩擦系数为0.2480。
该自润滑涂层轮胎模具的制备工艺采用了等离子体增强化学气相沉积技术，具有平整度高、致密性好、质量稳定且制备速率高等特点。

Claims (3)

1.一种具有自润滑涂层的轮胎模具，其特征在于：包括轮胎模具基材、Cr层、WC层和F-DLC层；
所述Cr层厚度为0.3-0.6μm，所述WC层厚度为0.5-0.8μm，所述F-DLC层厚度为1.5-1.8μm；
所述Cr层、WC层和F-DLC层表面粗糙度Ra为10-20nm，水接触角为90°-110°，乙醇接触角为20°-30°，表面能为18-20mN/m，纳米硬度为14-16GPa，摩擦系数为0.15-0.25。
2.一种如权利要求1所述的自润滑涂层轮胎模具的制备工艺，其特征在于包括以下步骤：
1)预处理：对轮胎模具基材表面进行打磨抛光处理，然后将轮胎模具基材依次侵入丙酮、酒精中进行超声清洗，吹干；
2)溅射清洗：将吹干后的轮胎模具基材置于镀膜室内的工件旋转支架上，对反应室进行抽真空，后通入氩气，保持真空度5×10-4-7×10-4Pa，偏压为-10—-20KV，占空比25％-45％，溅射时间20-30min；
3)沉积Cr打底层：溅射清洗后，利用靶材Cr在轮胎模具基材表面沉积Cr打底层，调节功率6-8KW，沉积时间20-30min；
4)沉积WC过渡层：沉积Cr打底层后，利用靶材WC在Cr打底层上沉积WC层，调节功率6-8KW，沉积时间50-60min；
5)沉积F-DLC涂层：沉积WC过渡层后，通入CH4，CF4，气流比例3.0-5.0，保持真空度5×10-4-7×10-4Pa，偏压为-700—-900V，沉积时间100-120min，在轮胎模具基材表面获得F-DLC涂层。
3.根据权利要求1所述的自润滑涂层轮胎模具，其特征在于：所述的轮胎模具基材为45#钢基材。
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