CN108117392A - 耐腐蚀的无粘结相硬质合金及其制备方法 - Google Patents

耐腐蚀的无粘结相硬质合金及其制备方法 Download PDF

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CN108117392A
CN108117392A CN201711262802.XA CN201711262802A CN108117392A CN 108117392 A CN108117392 A CN 108117392A CN 201711262802 A CN201711262802 A CN 201711262802A CN 108117392 A CN108117392 A CN 108117392A
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周悫昱
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Zhuzhou Sharp Hi Tech Material Co Ltd
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Abstract

本发明公开了一种耐腐蚀的无粘结相硬质合金及其制备方法，耐腐蚀的无粘结相硬质合金的组分及各组分的重量百分比如下：0.5～6.5％的TiC粉和Mo2C粉，0.5～5.0％的TaC粉和NbC粉以及0.3～1.5％的晶粒长大抑制剂，余量为费氏粒度0.2～0.4μm的超细WC粉，总计100％。本发明能够适用于高耐磨性、高红硬性和高耐腐蚀性的恶劣环境。

Description

耐腐蚀的无粘结相硬质合金及其制备方法
技术领域
本发明涉及一种耐腐蚀的无粘结相硬质合金及其制备方法。
背景技术
目前，WC–Co硬质合金由于具有高的强度、硬度以及高的杨氏模量而在很多领域得到了广泛的应用。例如机械加工、结构耐磨件、石油、矿山开采和模具等领域。WC-Co硬质合金的强度和韧性随着Co含量的增加而提高，但同时在一定的恶劣环境中，粘结相Co比硬质相更容易被腐蚀和氧化，因此在某些特殊场合，比如要求高硬度、高耐磨性、高红硬性、高抗腐蚀性的工作环境下，传统WC-Co硬质合金已经无法满足要求，因此研究新型的耐腐蚀的无粘结相硬质合金成为了必然的发展趋势。
发明内容
本发明所要解决的技术问题是克服现有技术的缺陷，提供一种耐腐蚀的无粘结相硬质合金，它能够适用于高耐磨性、高红硬性和高耐腐蚀性的恶劣环境。
为了解决以上技术问题，本发明的技术方案是：一种耐腐蚀的无粘结相硬质合金，它的组分及各组分的重量百分比如下：0.5～6.5％的TiC粉和Mo2C粉，0.5～5.0％的TaC粉和NbC粉以及0.3～1.5％的晶粒长大抑制剂，余量为费氏粒度0.2～0.4μm的超细WC粉，总计100％。
进一步，晶粒长大抑制剂为VC和Cr3C2的混合物。
进一步，超细WC粉的Hcp值的范围为41～55KA/m。
本发明还提供了一种耐腐蚀的无粘结相硬质合金的制备方法，方法的步骤中含有：
依次进行配料、高能球磨、真空干燥、压制成型和烧结工序；其中，球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为8～16h；在烧结工序中，烧结温度为1550～1750℃。
进一步，烧结采用气压烧结，压力为60Mpa。
采用了上述技术方案后，通过本发明的合理的配方及配比，使其能够适用于高耐磨性、高红硬性和高耐腐蚀性的恶劣环境。
具体实施方式
为了使本发明的内容更容易被清楚地理解，下面根据具体实施例，对本发明作进一步详细的说明。
实施例一
配料时选用重量百分比为3％的TiC+Mo2C粉，2.0％的TaC粉和NbC粉，VC+Cr3C2为0.6％，余量为02型WC粉，总计100％；球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为12小时，真空干燥制得混合料，模压成型后，置于高压烧结炉内以1650℃进行烧结，压力为60MPa。以PS21(尺寸为6.5×5.25×20㎜)试样条作为检验本实施例方法制备的硬质合金的标准产品，其WC平均晶粒度为0.6μm，抗断裂强度为7.9MPa·m1/2，抗弯强度为1800MPa，硬度Hv30 2200。
实施例二
配料时选用重量百分比为6％的TiC+Mo2C粉，0.5％的TaC粉和NbC粉，VC+Cr3C2为0.7％，余量为02型WC粉，总计100％；球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为14小时，真空干燥制得混合料，模压成型后，置于高压烧结炉内以1750℃进行烧结，压力为60MPa。以PS21(尺寸为6.5×5.25×20㎜)试样条作为检验本实施例方法制备的硬质合金的标准产品，其WC平均晶粒度为0.25μm，抗断裂强度为6.6MPa·m1/2，抗弯强度为1740MPa，硬度Hv30 2400。
实施例三：
配料时选用重量百分比为5.5％的TiC+Mo2C粉，1.5％的TaC粉和NbC粉，VC+Cr3C2为1.0％，余量为02型WC粉，总计100％；球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为10小时，真空干燥制得混合料，模压成型后，置于高压烧结炉内以1700℃进行烧结，压力为60MPa。以PS21(尺寸为6.5×5.25×20㎜)试样条作为检验本实施例方法制备的硬质合金的标准产品，其WC平均晶粒度为0.8μm，抗断裂强度为8.0MPa·m1/2，抗弯强度为1880MPa，硬度Hv30 2100。
实施例四：
配料时选用重量百分比为4.5％的TiC+Mo2C粉，3.0％的TaC粉和NbC粉，VC+Cr3C2为0.5％，余量为02型WC粉，总计100％；球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为8小时，真空干燥制得混合料，模压成型后，置于高压烧结炉内以1550℃进行烧结，压力为60MPa。以PS21(尺寸为6.5×5.25×20㎜)试样条作为检验本发明方法制备的硬质合金的标准产品，其WC平均晶粒度为1.0μm，抗断裂强度为8.4MPa·m1/2，抗弯强度为1920MPa，硬度Hv30 2000。
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (5)

1.一种耐腐蚀的无粘结相硬质合金，其特征在于它的组分及各组分的重量百分比如下：0.5～6.5％的TiC粉和Mo2C粉，0.5～5.0％的TaC粉和NbC粉以及0.3～1.5％的晶粒长大抑制剂，余量为费氏粒度0.2～0.4μm的超细WC粉，总计100％。
2.根据权利要求1所述的耐腐蚀的无粘结相硬质合金，其特征在于：晶粒长大抑制剂为VC和Cr3C2的混合物。
3.根据权利要求1所述的耐腐蚀的无粘结相硬质合金，其特征在于：超细WC粉的Hcp值的范围为41～55KA/m。
4.一种如权利要求1至3中任一项所述的耐腐蚀的无粘结相硬质合金的制备方法，其特征在于方法的步骤中含有：
依次进行配料、高能球磨、真空干燥、压制成型和烧结工序；其中，球磨前进行抽极限真空，于氩气保护下高能球磨处理，球料质量比为10:1,转速为400r/min，球磨时间为8～16h；在烧结工序中，烧结温度为1550～1750℃。
5.根据权利要求4所述的制备方法，其特征在于：烧结采用气压烧结，压力为60Mpa。
CN201711262802.XA 2017-12-04 2017-12-04 耐腐蚀的无粘结相硬质合金及其制备方法 Pending CN108117392A (zh)

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CN110735075A (zh) * 2019-10-10 2020-01-31 自贡硬质合金有限责任公司 一种高耐磨wc基硬质合金的制备方法
CN113453815A (zh) * 2019-02-19 2021-09-28 瑞典海博恩材料与技术有限公司 硬金属硬质合金
CN113651617A (zh) * 2021-07-06 2021-11-16 河钢承德钒钛新材料有限公司 一种碳化钒和碳化铬复合材料的制备方法

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Publication number Priority date Publication date Assignee Title
CN113453815A (zh) * 2019-02-19 2021-09-28 瑞典海博恩材料与技术有限公司 硬金属硬质合金
CN113453815B (zh) * 2019-02-19 2023-09-29 瑞典海博恩材料与技术有限公司 硬金属硬质合金
CN110735075A (zh) * 2019-10-10 2020-01-31 自贡硬质合金有限责任公司 一种高耐磨wc基硬质合金的制备方法
CN113651617A (zh) * 2021-07-06 2021-11-16 河钢承德钒钛新材料有限公司 一种碳化钒和碳化铬复合材料的制备方法

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