CN116875933A - 抑制高温脱碳的wc涂层合金及其制备方法 - Google Patents
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Abstract
本发明属于WC涂层技术领域,具体涉及一种抑制高温脱碳的WC涂层合金及其制备方法,包括:基体材料和WC涂层;其中所述基体材料上与WC涂层接触的部分为渗碳层;通过在基体材料上渗碳处理形成渗碳层,使得渗碳层中的碳以化合物形态存在于基底金属中,并与WC涂层共同形成固溶体状的化合物,并在激光熔覆过程中保持相对稳定的化学特性,抑制WC涂层脱碳现象的发生,从而提高覆盖质量和涂层附着力。
Description
技术领域
本发明属于WC涂层技术领域,具体涉及一种抑制高温脱碳的WC涂层合金及其制备方法。
背景技术
碳化钨是一种由钨和碳组成的化合物,为黑色六方晶体,有金属光泽,硬度与金刚石相近。纯的碳化钨易碎,若掺入少量钛、钴等金属,就能减少脆性。用作钢材切割工具的碳化钨,常加入碳化钛、碳化钽或它们的混合物,以提高抗爆能力。碳化钨的化学性质稳定,应用于硬质合金生产材料。
然而,在激光熔覆的超高温度场下,碳化钨涂层中往往出现W2C,单质W,Co3W3C和Co6W6C等脱碳产物,这些脱碳产物严重的降低了涂层的硬度和耐磨性能。
发明内容
本发明提供了一种抑制高温脱碳的WC涂层合金及其制备方法,以解决WC涂层易高温脱碳的问题。
为了解决上述技术问题,本发明提供了一种抑制高温脱碳的WC涂层合金,包括:基体材料和WC涂层;其中所述基体材料上与WC涂层接触的部分为渗碳层。
又一方面,本发明还提供了一种抑制高温脱碳的WC涂层合金的制备方法,包括如下步骤:步骤S1,预处理基体材料;步骤S2,采用井式气体渗碳炉对基体材料进行渗碳,在基体材料的一面得到渗碳层;步骤S3,在渗碳层上通过送粉机提供WC粉体并采用激光器进行激光熔覆制备WC涂层。
本发明的有益效果是,本发明的抑制高温脱碳的WC涂层合金及其制备方法通过在基体材料上渗碳处理形成渗碳层,使得渗碳层中的碳以化合物形态存在于基底金属中,并与WC涂层共同形成固溶体状的化合物,并在激光熔覆过程中保持相对稳定的化学特性,抑制WC涂层脱碳现象的发生,从而提高覆盖质量和涂层附着力。
本发明的其他特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本发明而了解。
为使本发明的上述目的、特征和优点能更明显易懂,下文特举较佳实施例,并配合所附附图,作详细说明如下。
附图说明
为了更清楚地说明本发明具体实施方式或现有技术中的技术方案,下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图是本发明的一些实施方式,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1是本发明的抑制高温脱碳的WC涂层合金的表面形貌图;
图2是本发明的抑制高温脱碳的WC涂层合金的摩擦曲线图;
图3是本发明的抑制高温脱碳的WC涂层合金的三维形貌图;
图4是本发明的抑制高温脱碳的WC涂层合金的磨痕扫描电镜和面扫描能谱图;
图5是本发明的抑制高温脱碳的WC涂层合金的激光熔覆温度场分布图;
图6是本发明的抑制高温脱碳的WC涂层合金的温度曲线分布图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合附图对本发明的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明提供了一种抑制高温脱碳的WC涂层合金,包括:基体材料和WC涂层;其中所述基体材料上与WC涂层接触的部分为渗碳层。
在本实施例中,具体的,所述基体材料为Ti-6Al-4V合金,其化学成分的质量百分比为:Al 5.5~6.75%;V 3.5~4.5%;其余为Ti。
在本实施例中,具体的,所述渗碳层的厚度为1~2mm;所述渗碳层的渗碳量为0.7~0.75%。
在本实施例中,具体的,与WC涂层所存在的碳化问题不同,渗碳层中的碳很难在高温电弧等熔覆过程中脱离,从而避免了WC涂层因高温熔覆而导致的碳化问题。渗碳层中的碳主要以化合物形态存在于基底金属中,与涂层发生化学反应形成了一些TiC,Cr7C3,Cr23C7,Cr3C2。这些固溶体能够在激光熔覆过程中保持相对稳定的化学特性,主要表现在它们能增强涂层表面和熔覆层之间的化学反应,从而提高覆盖质量和涂层附着力。
在本实施例中,具体的,发生的化学反应包括:
2WC→W2C+C;
Ti+C→TiC(原位合成);
Cr+C→Cr7C3/Cr23C7/Cr3C2。
在本实施例中,具体的,所述WC涂层的硬度不低于2316.7HV0.5;所述WC涂层的磨损率不高于27.36μm3·N-1·mm-1。
又一方面,本发明还提供了一种抑制高温脱碳的WC涂层合金的制备方法,包括如下步骤:步骤S1,预处理基体材料;步骤S2,采用井式气体渗碳炉对基体材料进行渗碳,在基体材料的一面得到渗碳层;步骤S3,在渗碳层上通过送粉机提供WC粉体并采用激光器进行激光熔覆制备WC涂层。
在本实施例中,具体的,所述步骤S1中预处理包括:依次进行粗磨、精磨和抛光。
在本实施例中,具体的,所述步骤S2中井式气体渗碳炉为RQ3-90-9型井。
在本实施例中,具体的,所述所述步骤S2中渗碳的工艺参数为:工作温度920~1050℃;工作电压380V;工作电流65A;渗碳时间6~8h。
在本实施例中,具体的,将基材加热至高温(约920-1050℃)后,将固态的碳源材料(散布在其表面上,并通过加压和高温处理使其与基底金属中碳原子相互渗透,从而形成一定厚度的碳层,并与基底金属相互作用形成化合物。这种碳化合物可以在激光熔覆过程中参与化学反应,从而对金属颗粒的化学特性和晶体结构产生影响。同时,这些化合物还可以加强涂层中不同金属颗粒之间的化学作用,从而提高涂层质量和附着力。
在本实施例中,具体的,所述步骤S3中WC粉体的粒径为22~48μm,优选亚琛联合科技(天津)有限公司牌号为Ni60WA的WC粉体。
在本实施例中,具体的,所述步骤S3中激光熔覆的激光器的功率为1700W,扫描速度为8mm/s,搭接率为40%;所述送粉机的送粉速率为8g/s。
实施例1
步骤S1,预处理基体材料;步骤S2,采用井式气体渗碳炉对基体材料进行渗碳,在基体材料的一面得到渗碳层;步骤S3,在渗碳层上通过送粉机提供WC粉体并采用激光器进行激光熔覆制备WC涂层。
所述基体材料的化学成分按质量份数为:Al 6%;V 4%;其余为Ti。
所述步骤S1中预处理包括:依次进行粗磨、精磨和抛光。
所述步骤S2中井式气体渗碳炉为RQ3-90-9型井。
所述所述步骤S2中渗碳的工艺参数为:工作温度920~1050℃;工作电压380V;工作电流65A;渗碳时间6~8h。
所述步骤S3中WC粉体的粒径为22~48μm,优选亚琛联合科技(天津)有限公司牌号为Ni60WA的WC粉体。
所述步骤S3中激光熔覆的激光器的功率为1700W,扫描速度为8mm/s,搭接率为40%;所述送粉机的送粉速率为8g/s。
制备得到实施例1的抑制高温脱碳的WC涂层合金。
根据实施例1的制备方法制备得到实施例2-6的抑制高温脱碳的WC涂层合金。
对比例1
步骤S1,预处理基体材料;步骤S2,在基体材料上通过送粉机提供WC粉体并采用激光器进行激光熔覆制备WC涂层。
所述基体材料的化学成分按质量份数为:Al 6%;V 4%;其余为Ti。
所述步骤S1中预处理包括:依次进行粗磨、精磨和抛光。
所述步骤S2中WC粉体的粒径为22~48μm,优选亚琛联合科技(天津)有限公司牌号为Ni60WA的WC粉体。
所述步骤S2中激光熔覆的激光器的功率为1700W,扫描速度为8mm/s,搭接率为40%;所述送粉机的送粉速率为8g/s。
制备得到对比例1的WC涂层合金。
对实施例1-6所制得的抑制高温脱碳的WC涂层合金进行检测,得到结果如表1:
表1
基于实施例1与对比例1进行进一步的性能比对。
由图1的抑制高温脱碳的WC涂层合金的表面形貌图可知,左侧为渗碳的对比例1表面出现了明显的脱碳现象,而右侧进行了渗碳处理的实施例1则保持了致密均匀的原子分布。
由图2的抑制高温脱碳的WC涂层合金的摩擦曲线图可知,下方的渗碳后的实施例1的摩擦系数相较于上方的未渗透对比例1出现了明显下降,主要归因于完整的WC颗粒具有更好的自润滑性。
由图3的抑制高温脱碳的WC涂层合金的三维形貌图可知,左侧未渗碳的对比例1的表面厚度明显低于右侧渗碳处理后的实施例1,涂层的硬度和耐磨性能在进行渗碳处理后获得了显著提升。
由图4的抑制高温脱碳的WC涂层合金的磨痕扫描电镜和面扫描能谱图可知,未渗碳的对比例1的WC涂层磨痕的面扫描分析。Ni、W、C、Fe、S、Na、Si和O的质量分数分别为32.69%、34.34%、1.12%、9.33%、4.48%、9.76%、5.22%和2.23%;渗碳处理的实施例1的WC涂层的磨痕面扫描分析。Ni、W、C、Fe、S、Na、Si和O的质量分数分别为32.58%、34.66%、0.72%、7.80%、5.09%、10.38%、4.87%和2.36%。其中Si元素来自摩擦副,其质量分数明显地低于未磨损的涂层,这表明在摩擦过程中,高硬度的涂层磨损性能好,物质转移少。
WC的硬度随着渗碳量的增加而增加,摩擦系数和磨损率也随之下降,在这归因于渗碳使得涂层中的WC颗粒变得更加完整,并且与涂层反应形成了Cr7C3,Cr23C7,Cr3C2金属化合物以及原位合成了TiC。
由图5和图6可见WC涂层合金的激光熔覆温度场均匀分布,且温度曲线存在有规律的差异起伏。
综上所述,本发明的抑制高温脱碳的WC涂层合金及其制备方法通过在基体材料上渗碳处理形成渗碳层,使得渗碳层中的碳以化合物形态存在于基底金属中,并与WC涂层共同形成固溶体状的化合物,并在激光熔覆过程中保持相对稳定的化学特性,抑制WC涂层脱碳现象的发生,从而提高覆盖质量和涂层附着力。
以上述依据本发明的理想实施例为启示,通过上述的说明内容,相关工作人员完全可以在不偏离本项发明技术思想的范围内,进行多样的变更以及修改。本项发明的技术性范围并不局限于说明书上的内容,必须要根据权利要求范围来确定其技术性范围。
Claims (10)
1.一种抑制高温脱碳的WC涂层合金,其特征在于,包括:
基体材料和WC涂层;其中
所述基体材料上与WC涂层接触的部分为渗碳层。
2.如权利要求1所述的抑制高温脱碳的WC涂层合金,其特征在于,
所述基体材料为Ti-6Al-4V合金,其化学成分的质量百分比为:
Al 5.5~6.75%;
V 3.5~4.5%;
其余为Ti。
3.如权利要求1所述的抑制高温脱碳的WC涂层合金,其特征在于,
所述渗碳层的厚度为1~2mm;
所述渗碳层的渗碳量为0.7~0.75%。
4.如权利要求1所述的抑制高温脱碳的WC涂层合金,其特征在于,
所述WC涂层的硬度不低于2316.7HV0.5;
所述WC涂层的磨损率不高于27.36μm3·N-1·mm-1。
5.一种抑制高温脱碳的WC涂层合金的制备方法,其特征在于,包括如下步骤:
步骤S1,预处理基体材料;
步骤S2,采用井式气体渗碳炉对基体材料进行渗碳,在基体材料的一面得到渗碳层;
步骤S3,在渗碳层上通过送粉机提供WC粉体并采用激光器进行激光熔覆制备WC涂层。
6.如权利要求5所述的制备方法,其特征在于,
所述步骤S1中预处理包括:
依次进行粗磨、精磨和抛光。
7.如权利要求5所述的制备方法,其特征在于,
所述步骤S2中井式气体渗碳炉为RQ3-90-9型井。
8.如权利要求5所述的制备方法,其特征在于,
所述所述步骤S2中渗碳的工艺参数为:
工作温度920~950℃;
工作电压380V;
工作电流65A;
渗碳时间6~8h。
9.如权利要求5所述的制备方法,其特征在于,
所述步骤S3中WC粉体的粒径为22~48μm。
10.如权利要求5所述的制备方法,其特征在于,
所述步骤S3中激光熔覆的激光器的功率为1700W,扫描速度为8mm/s,搭接率为40%;所述送粉机的送粉速率为8g/s。
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