CN108486545A - 一种耐腐蚀盾构机刀具 - Google Patents
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Abstract
本发明涉及一种耐腐蚀盾构机刀具,包括至上而下依次设置的类金刚石涂层、SiC过渡层及硬质合金基体层。本发明在硬质合金刀具上制备类金刚石涂层,使刀具和被加工材料之间的摩擦系数显著下降,能够有效阻止被加工材料与刀具基体之间的粘附,实现被切削材料表面质量的提高和刀具使用寿命的延长。
Description
技术领域
本发明属于盾构施工领域,涉及盾构机刀具,尤其是一种耐腐蚀盾构机刀具。
背景技术
硬质合金具有硬度高、耐磨、强度和韧性较好、耐热、耐腐蚀等一系列优良性能,在500℃的温度下能够保证稳定的高硬度和耐磨特性。硬质合金做为盾构机刀具的主要原材料之一,广泛应用于复杂地质层面的土壤、石材切削,为轨道交通地下掘进作业以及山体隧道挖掘等施工提供保障。盾构机刀具是挖掘过程中的关键零部件,刀具质量的好坏,直接影响到机械加工的效率和加工的成本,同时还影响到整机使用环境、可加工的地质范围等。刀具耐腐蚀涂层技术是一项提高切削加工效率和加工质量、扩大道具使用范围、延长刀具使用寿命的新技术。对盾构机刀具的主要材料表面涂覆一层耐腐蚀材料,以保持基体材料的原有属性,提高刀具表面化学稳定性,降低摩擦系数。
通过检索,发现如下两篇相关专利:
CN203669878U公开了一种盾构机用金刚石刀具,包括刀具体,刀具体上设有刮削面,刮削面上设有切削刃,刮削面表面电镀上第一金刚石耐磨层,第一金刚石耐磨层厚度为0.2~2mm。切削刃表面电镀上第二金刚石耐磨层,第二金刚石耐磨层厚度为1~6mm。所述第一金刚石耐磨层和第二金刚石耐磨层采用40~200目的人造金刚石材料制作。
CN205955739U公开了一种耐磨金刚石盾构刀具,包括盾构刀体,盾构刀体的端部设有多个切削齿,切削齿的切削面上设有金刚石复合片,盾构刀体的背部设有金刚石耐磨层,金刚石复合片为通过银基钎料焊接在切削齿的切削面上的复合片,金刚石复合片全出刃型或半出刃型焊接在切削齿的切削面上,金刚石耐磨层为电镀于盾构刀体背部的耐磨层。
上述两篇专利都涉及到金刚石耐磨层,但是实践证明金刚石耐磨层与基体的结合并不牢固,容易脱落,使用寿命短。
发明内容
本发明的目的在于克服现有技术的不足之处,提供一种使用寿命长,涂层与基体结合力强的耐腐蚀盾构机刀具。
本发明解决其技术问题是采取以下技术方案实现的:
一种耐腐蚀盾构机刀具,包括至上而下依次设置的类金刚石涂层、SiC过渡层及硬质合金基体层。
而且,所述的类金刚石涂层的厚度为0.8-2mm。
而且,所述的SiC过渡层的厚度为0.5-1.5mm。
而且,所述的类金刚石涂层、SiC过渡层均是采用等离子增强化学气相沉积法制备得到的涂层。
而且,在SiC过渡层与硬质合金基体层之间为金刚砂层。
制备方法如下:
1)刀具工件表面抛光处理
使用砂纸对工件表面进行抛光,去除表面污垢沉积及氧化层,使刀具表面达到Sa1级清洁度;
2)喷砂处理
采用压缩空气为动力形成高速喷射束,将金刚砂高速喷射到刀具工件表面,使刀具表面达到Sa2.5级清洁度;
3)碱性除油
采用碱性化学反应除油试剂,对工件进行表面碱性除油;
4)去离子水冲洗
采用去离子水对工件表面进行顺逆反复冲洗,使工件表面至中性状态;
5)超声波酒精冲洗
采用超声波清洗机配合工业酒精溶液对工件表面进行清洗,,完全除去工件表面附着物及杂质;
6)刀具加热
加热温度为100~150℃,持续时间20~40min;
7)刀具表面刻蚀
涂层表面刻蚀时,C2H2流量200~600sccm,H2流量200~900sccm,优选C2H2/H2流量比=1∶3。氩气流量200~300sccm,电压3500~4000V,频率2000Hz,脉宽5μs,持续时间20~30min;
8)沉积SiC过渡层
C3H10Si流量为10~30sccm,氩气流量为50~100sccm,电压4000V,频率2000Hz,脉宽10μs,持续时间60~180min;
9)沉积类金刚石涂层
C2H2或CH4流量200~600sccm,H2流量200~600sccm,)优选C2H2/H2流量比=1∶1。氩气流量100sccm,电压4000V,频率2000Hz,脉宽10μs,沉积温度200℃,沉积时间20-30h;
10)镀层完成后将工件放入60~70度温水中浸泡2~5分钟,然后用冷水冲洗,采用烘干设备烘干,涂层制作完毕。
本发明的优点和积极效果是:
1、本发明在硬质合金刀具上制备类金刚石涂层,使刀具和被加工材料之间的摩擦系数显著下降,能够有效阻止被加工材料与刀具基体之间的粘附,实现被切削材料表面质量的提高和刀具使用寿命的延长。
2、本发明采用SiC作为过渡层,降低了类金刚石涂层的内应力,提高类金刚石涂层和基体结合力,提升了类金刚石涂层厚度。
附图说明
图1为本发明的结构剖面图。
具体实施方式
下面结合附图并通过具体实施例对本发明作进一步详述,以下实施例只是描述性的,不是限定性的,不能以此限定本发明的保护范围。
一种耐腐蚀盾构机刀具,包括至上而下依次设置的类金刚石涂层1、SiC过渡层2、金刚砂层3及硬质合金基体层4。所述的类金刚石涂层的厚度为0.8-2mm,SiC过渡层的厚度为0.5-1.5mm,金刚砂层的厚度为0.2-1mm。
本刀具的制备工艺如下:
1.基体材料选用YG8硬质合金,材料成分:WC:92%,Co:8%,尺寸为100mm×80mm×40mm。
2.试件前处理工艺
为了保证涂层于基体牢固结合,涂层合金更易于附着于基体之上,获得最大的涂层厚度,在进行等离子增强化学沉积之前,必须对工件表面进行适当处理。
1)刀具工件表面抛光处理
使用600#金相砂纸对工件表面进行抛光,去除表面污垢沉积及氧化层,使刀具表面达到Sa1级清洁度。
2)喷砂处理
采用压缩空气为动力形成高速喷射束,将喷料(金刚砂)高速喷射到刀具工件表面,使工件外表面发生变化,通过磨料对工件表面的冲击和切削作用,使刀具工件表面获得一定的清洁度和不同的粗糙度,改善工件表面的机械性能,提高工件的搞疲劳性,增加了刀具和涂层之间的附着力,延长涂层的耐久性,此环节需要使刀具表面达到Sa2.5级清洁度。
3)碱性除油
采用碱性化学反应除油试剂,对工件进行表面碱性除油,将刀具完全浸泡至除油液内20分钟(NaOH:50g/L、Na2CO3:20g/L、Na3PO4:30g/L、OP乳化剂:3~5g/L、温度40℃)
4)去离子水冲洗
采用去常温离子水对工件表面进行顺逆反复冲洗2分钟,使工件表面至中性状态。
5)超声波酒精冲洗
采用超声波清洗机配合工业酒精溶液对工件表面进行清洗2分钟,完全除去工件表面附着物及杂质。
3.等离子增强化学气相沉积涂层制备工艺
1)刀具加热
加热温度为150℃,持续时间30min;
2)刀具表面刻蚀
涂层表面刻蚀时,C2H2流量300sccm,H2流量900sccm,氩气流量300sccm,电压4000V,频率2000Hz,脉宽5μs,持续时间30min;
类金刚石涂层的厚度与等离子体中C原子或离子团的浓度有关,在沉积过程中,等离子体浓度不变的情况下,通入H2时,C原子的相对含量下降导致涂层厚度下降,鉴于H2在反应过程中的刻蚀作用释放了涂层应力,选用气体流量C2H2/H2=1∶3,使得涂层结合力达到最大值。
3)沉积过渡层
为了降低类金刚石涂层的内应力,提高涂层和基体结合力,提升类金刚石涂层厚度,采用SiC作为过渡层。沉积过渡层SiC时,采用C3H10Si流量为25sccm,氩气流量为100sccm,电压4000V,频率2000Hz,脉宽10μs,持续时间120min。
4)沉积类金刚石涂层。
沉积类金刚石涂层时,C2H2流量300sccm,H2流量300sccm,C2H2/H2=1∶1,氩气流量100sccm,电压4000V,频率2000Hz,脉宽10μs,沉积温度200℃,沉积时间20-30h,已获得0.8-2mm涂层厚度。
选用C2H2/H2=1∶1的流量比例以便于提高C原子团浓度,实现涂层快速生长,并达到一定的厚度,此时涂层的sp3键的比例最大,能够降低涂层的摩擦系数。
镀层完成后将工件放入70度温水中浸泡2分钟,然后用冷水冲洗,采用烘干设备烘干,涂层制作完毕。
表1
尽管为说明目的公开了本发明的实施例和附图,但是本领域的技术人员可以理解:在不脱离本发明及所附权利要求的精神和范围内,各种替换、变化和修改都是可能的,因此,本发明的范围不局限于实施例和附图所公开的内容。
Claims (6)
1.一种耐腐蚀盾构机刀具,其特征在于:包括至上而下依次设置的类金刚石涂层、SiC过渡层及硬质合金基体层。
2.根据权利要求1所述的耐腐蚀盾构机刀具,其特征在于:所述的类金刚石涂层的厚度为0.8-2mm。
3.根据权利要求1所述的耐腐蚀盾构机刀具,其特征在于:所述的SiC过渡层的厚度为0.5-1.5mm。
4.根据权利要求1或2或3所述的耐腐蚀盾构机刀具,其特征在于:制备方法如下:
1)刀具工件表面抛光处理
使用砂纸对工件表面进行抛光,去除表面污垢沉积及氧化层,使刀具表面达到Sa1级清洁度;
2)喷砂处理
采用压缩空气为动力形成高速喷射束,将金刚砂高速喷射到刀具工件表面,使刀具表面达到Sa2.5级清洁度;
3)碱性除油
采用碱性化学反应除油试剂,对工件进行表面碱性除油;
4)去离子水冲洗
采用去离子水对工件表面进行顺逆反复冲洗,使工件表面至中性状态;
5)超声波酒精冲洗
采用超声波清洗机配合工业酒精溶液对工件表面进行清洗,,完全除去工件表面附着物及杂质;
6)刀具加热
加热温度为100~150℃,持续时间20~40min;
7)刀具表面刻蚀
涂层表面刻蚀时,C2H2流量200~600sccm,H2流量200~900sccm,氩气流量200~300sccm,电压3500~4000V,频率2000Hz,脉宽5μs,持续时间20~30min;
8)沉积SiC过渡层
C3H10Si流量为10~30sccm,氩气流量为50~100sccm,电压4000V,频率2000Hz,脉宽10μs,持续时间60~180min;
9)沉积类金刚石涂层
C2H2或CH4流量200~600sccm,H2流量200~600sccm,氩气流量100sccm,电压4000V,频率2000Hz,脉宽10μs,沉积温度200℃,沉积时间20-30h;
10)镀层完成后将工件放入60~70度温水中浸泡2~5分钟,然后用冷水冲洗,采用烘干设备烘干,涂层制作完毕。
5.根据权利要求4所述的耐腐蚀盾构机刀具,其特征在于:步骤7)C2H2/H2流量比=1∶3。
6.根据权利要求4所述的耐腐蚀盾构机刀具,其特征在于:步骤9)C2H2/H2流量比=1∶1。
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