CN107522491A - 全致密碳化钨硬质合金的制备方法 - Google Patents

全致密碳化钨硬质合金的制备方法 Download PDF

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CN107522491A
CN107522491A CN201610444473.XA CN201610444473A CN107522491A CN 107522491 A CN107522491 A CN 107522491A CN 201610444473 A CN201610444473 A CN 201610444473A CN 107522491 A CN107522491 A CN 107522491A
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范思远
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Zhangjiagang Ship Hardware Tools Co Ltd
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/5607—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on refractory metal carbides
    • C04B35/5626—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on refractory metal carbides based on tungsten carbides
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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    • C04B2235/661—Multi-step sintering
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Abstract

本申请公开了一种全致密碳化钨硬质合金的制备方法，包括：(1)、对碳化钨粉末进行热压烧结；(2)、采用热等静压工艺对热压烧结后的材料进行热等静压后处理。本发明方法可以获得高致密度、晶粒细小、组织分布均匀的无粘结剂的碳化钨硬质合金。

Description

全致密碳化钨硬质合金的制备方法
技术领域
本申请涉及一种全致密碳化钨硬质合金的制备方法。
背景技术
碳化钨具有高熔点、高硬度、高韧性、抗磨损、高导热等特性，广泛应用在刀具材料领域，而且钨的碳化物显示了极高的催化活性，有希望取代贵金属催化剂，因此相关的研究很多。由于碳化钨粉的化学纯度和物理性能要求严格，使得制取碳化钨粉的工艺很复杂，用传统的工艺从黑钨精矿或白钨精矿生产碳化钨，通常必须经过仲钨酸铵生产、钨粉制备和碳化等许多工序制成的碳化钨，生产成本高。
发明内容
本发明的目的在于提供一种全致密碳化钨硬质合金的制备方法，以克服现有技术中的不足。
为实现上述目的，本发明提供如下技术方案：
本申请实施例公开一种全致密碳化钨硬质合金的制备方法，包括：
(1)、对碳化钨粉末进行热压烧结；
(2)、采用热等静压工艺对热压烧结后的材料进行热等静压后处理。
优选的，在上述的全致密碳化钨硬质合金的制备方法中，所述步骤(1)具体包括：将碳化钨粉末放入石墨模具中，先施加17～20MPa压力冷压，然后去掉压力，等真空度小于10Pa时开始升温，升温到1900～2000℃时，控制25～30MPa压力保持25～30分钟，冷却至800～1000℃。
优选的，在上述的全致密碳化钨硬质合金的制备方法中，所述升温方法包括：先以5～8℃/min的升温速度升温至800～1000℃，然后以8～10℃/min加热到1500～1600℃，再以3～5℃/min加热到1900～2000℃。
优选的，在上述的全致密碳化钨硬质合金的制备方法中，所述冷却方法为：以10℃/min速率冷却至800～1000℃。
优选的，在上述的全致密碳化钨硬质合金的制备方法中，升温的最终温度为2000℃。
优选的，在上述的全致密碳化钨硬质合金的制备方法中，所述步骤(2)中，烧结温度1750～1800℃，控制烧结压力130～150MPa并保温1.5～2小时。
与现有技术相比，本发明的优点在于：本发明方法可以获得高致密度、晶粒细小、组织分布均匀的无粘结剂的碳化钨硬质合金。
具体实施方式
本发明通过下列实施例作进一步说明：根据下述实施例，可以更好地理解本发明。然而，本领域的技术人员容易理解，实施例所描述的具体的物料比、工艺条件及其结果仅用于说明本发明，而不应当也不会限制权利要求书中所详细描述的本发明。
实施例1
全致密碳化钨陶瓷材料的制备方法
(1)、热压烧结
将碳化钨粉末放入石墨模具中，先施加17MPa压力冷压，然后去掉压力，等真空度小于10Pa时开始升温，先以5℃/min的升温速度升温至800℃，然后以10℃/min加热到1600℃，再以3℃/min加热到2000℃，控制30MPa压力保持30分钟，以10℃/min速率冷却至1000℃。
热压烧结后，材料相对密度为97.5％，硬度为25.6GPa，断裂韧性为4.8MPa·m1/2。
(2)、采用热等静压工艺对热压烧结后的材料进行热等静压后处理。
烧结温度1750℃，控制烧结压力150MPa并保温2小时。
通过静压后处理后，材料相对密度提高至99％。硬度为26.4GPa，断裂韧性为4.9MPa·m1/2。
实施例2
全致密碳化钨陶瓷材料的制备方法
(1)、热压烧结
将碳化钨粉末放入石墨模具中，先施加17MPa压力冷压，然后去掉压力，等真空度小于10Pa时开始升温，先以8℃/min的升温速度升温至800℃，然后以10℃/min加热到1500℃，再以3℃/min加热到1900℃，控制30MPa压力保持30分钟，以10℃/min速率冷却至1000℃。
热压烧结后，材料相对密度为96.8％，硬度为24.2GPa，断裂韧性为4.78MPa·m1/2。
(2)、采用热等静压工艺对热压烧结后的材料进行热等静压后处理。
烧结温度1800℃，控制烧结压力150MPa并保温2小时。
通过静压后处理后，材料相对密度提高至99％。硬度为26.1GPa，断裂韧性为4.86MPa·m1/2。
最后，还需要说明的是，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。

Claims (6)

1.一种全致密碳化钨硬质合金的制备方法，其特征在于，包括：
(1)、对碳化钨粉末进行热压烧结；
(2)、采用热等静压工艺对热压烧结后的材料进行热等静压后处理。
2.根据权利要求1所述的全致密碳化钨硬质合金的制备方法，其特征在于：所述步骤(1)具体包括：将碳化钨粉末放入石墨模具中，先施加17～20MPa压力冷压，然后去掉压力，等真空度小于10Pa时开始升温，升温到1900～2000℃时，控制25～30MPa压力保持25～30分钟，冷却至800～1000℃。
3.根据权利要求2所述的全致密碳化钨硬质合金的制备方法，其特征在于：所述升温方法包括：先以5～8℃/min的升温速度升温至800～1000℃，然后以8～10℃/min加热到1500～1600℃，再以3～5℃/min加热到1900～2000℃。
4.根据权利要求2所述的全致密碳化钨硬质合金的制备方法，其特征在于：所述冷却方法为：以10℃/min速率冷却至800～1000℃。
5.根据权利要求2所述的全致密碳化钨硬质合金的制备方法，其特征在于：升温的最终温度为2000℃。
6.根据权利要求1所述的全致密碳化钨硬质合金的制备方法，其特征在于：所述步骤(2)中，烧结温度1750～1800℃，控制烧结压力130～150MPa并保温1.5～2小时。
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CN111646800A (zh) * 2020-05-13 2020-09-11 株洲天成金属激光高科有限公司 一种无粘结相全致密碳化钛型材的制备工艺
CN113429208A (zh) * 2021-06-11 2021-09-24 广东金鑫得新材料有限公司 一种纯碳化钨的快速制备方法
CN114315358A (zh) * 2021-12-27 2022-04-12 海南大学 一种全致密无粘结剂碳化钨陶瓷及其制备方法
CN115125426A (zh) * 2022-07-08 2022-09-30 西南交通大学 一种含高密度位错/层错的无粘结相超细晶碳化钨硬质合金及其制备方法

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111646800A (zh) * 2020-05-13 2020-09-11 株洲天成金属激光高科有限公司 一种无粘结相全致密碳化钛型材的制备工艺
CN113429208A (zh) * 2021-06-11 2021-09-24 广东金鑫得新材料有限公司 一种纯碳化钨的快速制备方法
CN114315358A (zh) * 2021-12-27 2022-04-12 海南大学 一种全致密无粘结剂碳化钨陶瓷及其制备方法
CN114315358B (zh) * 2021-12-27 2023-01-24 海南大学 一种全致密无粘结剂碳化钨陶瓷及其制备方法
CN115125426A (zh) * 2022-07-08 2022-09-30 西南交通大学 一种含高密度位错/层错的无粘结相超细晶碳化钨硬质合金及其制备方法

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Application publication date: 20171229