CN111826568A - WC-6Co-石墨自润滑硬质合金制备方法 - Google Patents
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- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
- B22F2003/1054—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by microwave
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
Abstract
本发明涉及一种WC‑6Co‑石墨自润滑硬质合金制备方法,WC‑Co‑石墨复合材料由高能球磨后细化的WC,纯Co粉和石墨球高能球磨混合形成,所得复合材料的石墨为石墨球在球磨时切削片,球磨介质为水或酒精,球磨混合一定时间后取出,并烘干、过筛以及造粒后使用一定压力的冷压成型和冷等静压。将压制好的胚体置于微波炉中烧结,采用一定的升温速率使得胚体达到一定温度后保温,烧结完毕后随炉冷却。本发明制备WC‑6Co‑石墨自润滑硬质合金制备方法,目的是为目的是为了增加WC‑Co自润滑,从而提高硬质合金复合材料的磨损能力,本发明制备过程中无污染,低耗能,该高熵合金基复合材料可广泛应用于航空飞行器的高温结构件和耐腐蚀件,前景广阔。
Description
技术领域
本发明涉及金属陶瓷复合材料制备技术领域,具体涉及WC-6Co-石墨自润滑硬质合金制备方法。
背景技术
WC基硬质合金,纯WC硬质合金具有很高的硬度和优异的耐磨性、抗氧化性和抗腐蚀性,然而由于WC的熔点高达2900℃,通过SPS烧结技术得到细化的无粘结相WC硬质合金,硬度和断裂韧性分别达到2600HV10和3~4MPa·m1/2,难以满足WC刀具切削时需要,WC-Co系硬质合金是近几十年来应用最广的硬质合金,Co具有优良的韧塑性,Co与WC之间润湿性非常好,可以达到全致密,同时相比于WC而言,Co的熔点较低(1475℃),可以在较低的温度下实现液相烧结,WC-Co硬质合金具有较高的硬度,适中的韧性,表现出优良的综合性能,但使用WC-Co硬质合金制造的刀具在高速切削下,会与零件摩擦,加剧刀具的磨损,刀具的使用寿命不高,因此,制备一种寿命较高的WC-Co硬质合金刀具成了业内函待解决的问题。
发明内容
本发明所要解决的技术问题是:通过采用石墨球在高能球磨时用硬质合金球切削石墨球得到片状石墨,使得石墨均匀分布在WC-Co中,目的是为了增加WC-Co自润滑,从而提高硬质合金复合材料的磨损能力。此硬质合金,具有高熔点、高强度、高硬度、高耐磨等特点。
本发明的技术方案是:
本发明涉及WC-6Co-石墨自润滑硬质合金制备方法,采用粉末冶金-微波烧结法原位制备,具体包括如下步骤:
(1)本实验采用的湿磨法,所以往球磨罐中加入无水乙醇,按配比计算WC细粉、高纯度Co粉,将所称取的原料与石墨球一起倒入球磨罐。
(2)将球磨后的复合粉放在干燥箱中干燥,将石墨球取出,用超声波清洗机将石墨球表面的粉末震荡干净然后干燥处理,称量石墨球的质量,然后按配比补充适量的WC细粉和高纯度Co粉,然后混合粉末。
(3)所得混合粉末烘干、过筛以及造粒后使用一定压力的冷压成型和冷等静压。将压制好的胚体置于微波烧结炉中,通过一定的升温速率使得胚体达到一定温度后保温。
(4)经上述步骤,可得到具有分布均匀的石墨片的WC-6Co-石墨自润滑硬质合金。
优选的,球磨后细化的WC粉,按配比计算WC细粉、高纯度Co粉、石墨球量。
优选的,所制备样品的石墨为高能球磨时石墨球切削屑而成。
优选的,球磨转速为100-200r/min球磨时间为12~48h,冷等静压压力为100~300MPa。
优选的,烧结设备为微波烧结炉。
优选的,升温速率为5~20℃/min,烧结温度为1400℃~1700℃,保温时间为15min~60min,烧结气氛为真空或氩气气氛。
WC-Co硬质合金具有较高的硬度,适中的韧性,表现出优良的综合性能,通过改变硬质相WC与粘结相Co的比例、改变硬质相WC的晶粒大小等参数,可以根据不同的使用需求,制备得到具有不同硬度与韧性组合的硬质合金材料,本发明通过采用石墨球在高能球磨时用硬质合金球切削石墨球得到片状石墨,使得石墨均匀分布在WC-Co中,增加自润滑,提高硬质合金复合材料的抗磨损能力,从而提高刀具的使用寿命,本发明的硬质合金,具有高熔点、高强度、高硬度、高耐磨等特点,与其他技术相比,本发明的突出优势为:
(1)采用粉末冶金-微波烧结技术,降低了成本,无污染,升温速度快。
(2)通过采用石墨球在高能球磨时用硬质合金球切削石墨球得到片状石墨,可使石墨分布均匀。
(3)制备WC-6Co-石墨自润滑硬质合金复合材料可保证其具有较高润滑性,增加其使用寿命。
附图说明
图1为实施例1的微波烧结制备WC-6Co-石墨自润滑硬质合金复合材料试样的XRD图;
图2为实施例1的微波烧结制备WC-6Co-石墨自润滑硬质合金复合材料的表面SEM图;
图3为实施例1的微波烧结原位制备WC-6Co-石墨自润滑硬质合金复合材料摩擦系数图。
具体实施方式
以下通过具体实施例和附图更为详细的说明本发明,但下面具体描述内容仅为示例性而非限制性,实施例中描述的技术特征或技术特征的组合不应当被认为是孤立的,他们可以被相互组合从而达到更好的技术特征。
实施例1
WC的制备:将WC粉(粉体为30gWC)以球料比为10:1的量放入硬质合金球墨罐中,然后加入20ml酒精作为球磨介质球磨;使用高能球磨机球磨12h,150r/min,之后使用100℃干燥箱干燥,将混合材料过200目筛子进行研磨造粒。
WC-6Co-石墨混合粉制备:将94wt%WC、6Cowt%、石墨球(15mm)和硬质合金球混合,在高能球磨机上进行湿磨,球磨介质为无水乙醇,转速为以150r/min的转速,球磨时间为12h,根据实验所需石墨含量球磨不同的时间,实验前先称取石墨球的重量,球磨结束后,称取石墨球的重量,计算石墨从石墨球磨下来的重量,这时可获得WC-6CO-xwt.%复合粉末。接下来,加入合理的细WC和Co粉以及硬质合金球进行第二次球磨,球磨时间均为12h,转速为150r/min,将这种球磨方法标记为机械研磨法,之后使用100℃干燥箱干燥,将混合材料过200目筛子后,制得规格分别为36mm×4mm×3mm的长条样品和Φ13mm×5mm的圆片样品,随后将压制好的生胚用保鲜膜包裹,进行冷等静压处理,采用200MPa的高压并保压三分钟,制得相对致密的生胚,之后将胚体放置微波烧结炉中烧结,烧结过程通入Ar气体保护,升温速率10℃/min,加热至1400℃保温15min后炉冷取出,使用金刚石沙盘磨去表面烧损层与氧化层。
图1为实施例1的微波烧结制备WC-6Co-石墨自润滑硬质合金复合材料试样的XRD图。
图2为实施例1的微波烧结制备WC-6Co-石墨自润滑硬质合金复合材料的表面SEM图。
图3为实施例1的中微波烧结原位制备WC-6Co-石墨自润滑硬质合金复合材料摩擦系数图。
本文虽然给出了本发明的实施例,但是本领域的技术人员应当理解,在不脱离本发明精神的情况下,可以对本文的实施例进行改变。上述实施例只是示例性的,不应以本文的实施例作为本发明权利范围得到限定。
Claims (5)
1.一种WC-6Co-石墨自润滑硬质合金制备方法,其特征在于具体步骤为:
(1)采用湿磨法,往球磨罐中加入无水乙醇,按配比计算WC细粉、高纯度Co粉,将所称取的原料与石墨球一起倒入球磨罐;
(2)将球磨后的复合粉放在干燥箱中干燥,将石墨球取出,用超声波清洗机将石墨球表面的粉末震荡干净然后干燥处理,称量石墨球的质量,然后按配比补充适量的WC细粉和高纯度Co粉,然后混合粉末;
(3)所得混合粉末烘干、过筛以及造粒后使用一定压力的冷压成型和冷等静压。将压制好的胚体置于微波烧结炉中,通过一定的升温速率使得胚体达到一定温度后保温;
(4)经上述步骤,可得到具有分布均匀的石墨片的WC-6Co-石墨自润滑硬质合金。
2.如权利要求1所述的WC-6Co-石墨自润滑硬质合金制备方法,其特征在于,所制备样品的石墨为高能球磨时石墨球切削屑而成。
3.如权利要求1所述WC-6Co-石墨自润滑硬质合金制备方法,其特征在于:球磨转速为100-200r/min,球磨时间为12~24h,冷等静压压力为100~300MPa。
4.如权利要求1所述的WC-6Co-石墨自润滑硬质合金制备方法,其特征在于:烧结设备为微波烧结炉。
5.如权利要求1所述的WC-6Co-石墨自润滑硬质合金制备方法,其特征在于:升温速率为5~20℃/min,烧结温度为1400℃~1700℃,保温时间为15min~60min,烧结气氛为真空或氩气气氛。
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CN113061764A (zh) * | 2021-03-16 | 2021-07-02 | 昆山长鹰硬质材料科技股份有限公司 | 一种碳化钨基硬质合金及其制备方法 |
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