CN107385439B - 一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法 - Google Patents

一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法 Download PDF

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CN107385439B
CN107385439B CN201710409445.9A CN201710409445A CN107385439B CN 107385439 B CN107385439 B CN 107385439B CN 201710409445 A CN201710409445 A CN 201710409445A CN 107385439 B CN107385439 B CN 107385439B
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傅圣利
杨宏
李婕
袁兵云
崔秀秀
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Quanzhou Zhongzhi Diamond Tools Co ltd
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Abstract

本发明公开了一种Cu‑Ag‑Ti的金刚石钎焊涂层，包括钛粉层、银镀层和附着在金刚石上的铜镀层，银镀层位于铜镀层和钛粉层之间。其中，各组分按照质量百分比如下：铜20～35％，银50～75％，钛5～15％。本发明还公开了一种使用化学镀的制备方法，先在金刚石表面镀上铜层和银层，再把镀好的金刚石与钛粉混合烧结，就得到了Cu‑Ag‑Ti的金刚石钎焊料涂层。本发明与金刚石界面结合强度高，包覆钎焊料涂层的金刚石与其他粘接料烧结具有更好的结合力。

Description

一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法
技术领域
本发明涉及一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法。
背景技术
金刚石的高硬度和优良物理机械性能使得金刚石工具成为加工各种坚硬材料不可缺少的有效工具。胎体金属基对金刚石的粘结性(胎体的包镶能力)是影响金刚石工具使用寿命和性能的主要因素之一。
由于金刚石与一般金属和合金之间具有很高的界面能，致使金刚石颗粒不能为一般低熔点合金所浸润，粘结性极差。在传统的金属基烧结金刚石工具制造技术中，金刚石颗粒仅靠胎体冷缩后产生的机械夹持力镶嵌于胎体金属基中，而没有形成牢固的化学键结或冶金结合，胎体与金刚石界面结合不牢，导致金刚石颗粒在工作中易与胎体金属基分离，存在金刚石大量脱落问题，大大降低了金刚石工具的寿命及性能水平。大部分孕镶式工具中金刚石的利用率较低，大量昂贵的金刚石在工作中脱落流失于废屑之中。
在金刚石表面增加金属涂层，可有效改善金刚石的脱落，目前应用最普遍的金属涂层是在金刚石表面微蒸发镀钛。由于钛镀层太薄，不能抵挡烧结过程中胎体石墨化元素对金刚石的侵蚀，导致钛镀层与金刚石及胎体金属界面间结合强度不高，金刚石脱落的现象仍然较严重。
目前，用钎焊法制作金刚石(或立方氮化硼)工具已开始成为热点技术，钎焊料是指由铜锡钛等金属烧结而成的合金，它是粉状或片状；使用的时候把钎焊料放到胎体金属上，再把金刚石放到钎焊料上，再进行加热烧结，金刚石就结到胎体金属上了。
钎焊料对金刚石表面润湿性很好，与金刚石界面结合强度高，把钎焊料做成涂层，应该能很好地解决金刚石脱落的问题，但是如何把钎焊料做成涂层，目前还没有很好的办法。
因此，本发明人对此做进一步研究，研发出一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法，本案由此产生。
发明内容
本发明所要解决的技术问题在于提供一种Cu-Ag-Ti的金刚石钎焊涂层和其制备方法，与金刚石界面结合强度高，包覆钎焊料涂层的金刚石与其他粘接料烧结具有更好的结合力。
为解决上述技术问题，本发明的技术解决方案是：
一种Cu-Ag-Ti的金刚石钎焊涂层，包括钛粉层、银镀层和附着在金刚石上的铜镀层，银镀层位于铜镀层和钛粉层之间。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜20～35％，银50～75％，钛5～15％。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜20％，银75％，钛5％。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜33％，银60％，钛7％。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜35％，银60％，钛5％。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜25％，银65％，钛10％。
进一步，所述的钎焊涂层，各组分按照质量百分比如下：铜32.5％，银55％，钛12.5％。
一种Cu-Ag-Ti的金刚石钎焊涂层的制备方法，包括以下步骤：
步骤一、金刚石表面化学镀铜：把表面镀钛金刚石放入化学镀铜溶液中，不断搅拌；60℃-70℃镀施5min-45min，用量为45-50目金刚石5g/150-750ml镀液，得到铜镀层，镀层增重用时间控制；
步骤二、金刚石表面再化学镀银：把镀好铜的金刚石洗净，放入化学镀银溶液中，不断搅拌；15℃-20℃镀施25min-70min，用量为45-50目金刚石5g/250-500ml镀液，得到银镀层，增重用时间控制；
步骤三、钛粉烧结：把镀好的金刚石洗净，烘干，再和300目钛粉混匀，用量比为：3g金刚石/10g钛粉，放入真空炉中，抽真空1-30Pa，780-960℃保温60-300min，在银镀层熔化时，钛粉也熔入或粘接形成钛粉层，由于钛粉包围，金刚石之间不会粘连，冷却后，筛分金刚石与钛粉，就得到了包覆Cu-Ag-Ti钎焊料涂层的金刚石。
进一步，在步骤一中，化学镀铜配方如下：CuSO4·5H2O 10-30g/L，酒石酸钾钠NaKC4H4O6·4H2O 10-30g/L，Na2EDTA10-30g/L，NaOH 10-30g/L，38％甲醛CH2O 8-20ml/L。
进一步，在步骤二中，化学镀银溶液配方如下：
A液： B液：
AgNO3 1.5-5.0g 38％甲醛CH2O 1.0-5.0ml
NH4OH 2.0-10.0ml 95％酒精 60-90ml
H2O 70-150mL
使用时把A液和B液1:1混合。
采用上述方案后，由于本发明用电镀的方法先在金刚石表面镀上铜层和银层，再把镀好的金刚石与钛粉混合烧结，就得到了Cu-Ag-Ti的金刚石钎焊料涂层，通过抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块比用镀钛金刚石烧结的标准块强度大。
附图说明
图1是本发明的结构示意图；
图2是本发明和粘接料混合烧结后的结构示意图。
标号说明
金刚石1 铜镀层2 银镀层3
钛粉层4 铜银钛钎焊料合金涂层5
具体实施方式
下面结合附图和具体实施例对本发明作进一步详述。如图1所示，为本发明的较佳实施例，一种Cu-Ag-Ti的金刚石钎焊涂层，包括钛粉层4、银镀层3和附着在金刚石1上的铜镀层2，银镀层3位于铜镀层2和钛粉层4之间。其中，所述的钎焊涂层，各组分按照质量百分比如下：铜20～35％，银50～75％，钛5～15％。
实施例1
一种Cu-Ag-Ti的金刚石钎焊涂层，其中各组分按照质量百分比如下：铜20％，银75％，钛5％。其制备方法如下：
金刚石表面化学镀铜：把表面镀钛金刚石放入化学镀铜溶液中，不断搅拌；60℃-70℃镀施5min-20min，用量为45-50目金刚石5g/150ml镀液，得到铜镀层，镀层增重用时间控制；化学镀铜配方如下：CuSO4·5H2O 10-30g/L，酒石酸钾钠NaKC4H4O6·4H2O 10-30g/L，Na2EDTA 10-30g/L，NaOH 10-30g/L，38％甲醛CH2O 8-20ml/L。
金刚石表面再化学镀银：把镀好铜的金刚石洗净，放入化学镀银溶液中，不断搅拌；15℃-20℃镀施25min-70min，用量为45-50目金刚石5g/750ml镀液，得到银镀层，增重用时间控制；化学镀银溶液配方如下：使用时把A液和B液1:1混合。
A液： B液：
AgNO3 1.5-5.0g 38％甲醛CH2O 1.0-5.0ml
NH4OH 2.0-10.0ml 95％酒精 60-90ml
H2O 70-150mL
钛粉烧结：把镀好的金刚石洗净，烘干，再和300目钛粉混匀，用量比为：3g金刚石/10g钛粉，放入真空炉中，抽真空1-30Pa，780-960℃保温60-300min，在镀层熔化时，钛粉也熔入或粘接形成钛粉层，由于钛粉包围，金刚石之间不会粘连，冷却后，筛分金刚石与钛粉，就得到了包覆Cu-Ag-Ti钎焊料涂层的金刚石。
抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块抗弯强度为1289.1Mpa，比用镀钛金刚石烧结的标准块强度1183.5Mpa大。即包覆钎焊料涂层的金刚石与其他粘接料烧结具有更好的结合力。
实施例2
实施例2与实施例1采用一样的制备方法，与实施例1不同在于，金刚石钎焊涂层，其中各组分按照质量百分比如下：铜33％，银60％，钛7％。
抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块抗弯强度为1275.2Mpa。
实施例3
实施例3与实施例1采用一样的制备方法，与实施例1不同在于，金刚石钎焊涂层，其中各组分按照质量百分比如下：铜25％，银65％，钛10％。
抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块抗弯强度为1285.6Mpa。
实施例4
实施例4与实施例1采用一样的制备方法，与实施例1不同在于，金刚石钎焊涂层，其中各组分按照质量百分比如下：铜32.5％，银55％，钛12.5％。
抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块抗弯强度为1258.7Mpa。
实施例5
实施例5与实施例1采用一样的制备方法，与实施例1不同在于，金刚石钎焊涂层，其中各组分按照质量百分比如下：铜35％，银60％，钛5％。
抗弯强度测试表明：用钎焊料涂层金刚石烧结的标准块抗弯强度为1267.6Mpa。
综上所述，本发明直接在金刚石表面做钎焊料涂层，在金刚石表面做一层钎焊料，在使用的时候，如图2所示，把有钎焊料涂层的金刚石和粘接料混合，热压烧结成块，做成锯片上用的刀头。本发明的金刚石界面结合强度高，包覆钎焊料涂层的金刚石与其他粘接料烧结具有更好的结合力，能很好地解决金刚石脱落的问题。
以上所述，仅是本发明的较佳实施例而已，并非对本发明的技术范围作任何限制，故但凡依本发明的权利要求和说明书所做的变化或修饰，皆应属于本发明专利涵盖的范围之内。

Claims (1)

1.一种Cu-Ag-Ti的金刚石钎焊涂层的制备方法，其特征在于：包括以下步骤：
步骤一、金刚石表面化学镀铜：把表面镀钛金刚石放入化学镀铜溶液中，不断搅拌；60℃-70℃镀施5 min -20 min，用量为45-50目金刚石5g /150-750ml镀液，得到铜镀层，镀层增重用时间控制；
步骤二、金刚石表面再化学镀银：把镀好铜的金刚石洗净，放入化学镀银溶液中，不断搅拌；15℃-20℃镀施25 min -70 min，用量为45-50目金刚石5g /250-500ml镀液，得到银镀层，增重用时间控制；
步骤三、钛粉烧结：把镀好的金刚石洗净，烘干，再和300目钛粉混匀，用量比为：3g金刚石/10g钛粉，放入真空炉中，抽真空1-30Pa，780-960℃保温60-300min，在银镀层熔化时，钛粉也熔入或粘接形成钛粉层，由于钛粉包围，金刚石之间不会粘连，冷却后，筛分金刚石与钛粉，就得到了包覆Cu-Ag-Ti钎焊料涂层的金刚石；
在步骤一中，化学镀铜配方如下：CuSO4·5H2O 10-30g/L，酒石酸钾钠NaKC4H4O6·4H2O10-30g/L，Na2EDTA 10-30g/L，NaOH 10-30g/L，38%甲醛CH2O 8-20ml/L；
在步骤二中，化学镀银溶液配方如下：
A液： B液：
AgNO3 1.5-5.0g 38%甲醛CH2O 1.0-5.0ml
NH4OH 2.0-10.0ml 95%酒精 60-90ml
H2O 70-150mL
使用时把A液和 B液1:1混合。
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