CN111593246A - 一种地矿球齿的制备方法 - Google Patents
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Abstract
本发明涉及一种地矿球齿的制备方法,包括:配料球磨,原料包括WC粉和Co粉,所述Co粉中掺杂有TaC,向所述原料中添加酒精后置于球磨机中球磨得到混合浆料;将所述混合浆料采用喷雾制粒法制粒得到混合粒料;对所述混合粒料进行模压成型得到成型体;对所述成型体进行烧结后得到制品;对所述制品进行表面钝化抛光处理得到地矿球齿。方法制备的地矿球齿钻硬岩深度达到300米以上。
Description
技术领域
本发明涉及一种球齿的制备方法,尤其涉及一种地矿合金球齿的制备方法。
背景技术
现有的国内WC-Co硬质合金地矿材料通常由于配方和球磨工艺问题,导致合金球头密度差,内部金相组织不稳定(时而夹杂时而加粗等问题),合金在超硬岩层工作时,表现不理想,性能不稳定,耐磨性不好,钻岩距离不足的问题。
发明内容
本发明为了解决现有WC-Co硬质合金地矿球齿耐磨性低导致的钻岩距离不足的问题,提供了一种地矿球齿的制备方法,该方法制备的地矿球齿钻硬岩深度达到300米以上。
本发明所采取的方案为:一种地矿球齿的制备方法,包括
a 配料球磨,原料包括WC粉和Co粉,所述Co粉中掺杂有TaC,向所述原料中添加酒精后置于球磨机中球磨得到混合浆料;
b 将所述混合浆料采用喷雾制粒法制粒得到混合粒料;
c 对所述混合粒料进行模压成型得到成型体;
d 对所述成型体进行烧结后得到制品;
e 对所述制品进行表面钝化抛光处理得到地矿球齿。
进一步的,所述原料中包括如下质量份数:
WC粉 92~94份;
Co粉 6~8份;
其中所述Co粉中掺杂有Co粉总质量3%-5%的TaC。在Co粉添加添加剂减少三相析出的可能,提高合金的强度。
进一步的,所述球磨机中加入27-35份酒精,150-300份Φ6合金球。
进一步的,所述球磨机在球磨时转速30-38r/min,球磨时间16-32H。
进一步的,所述喷雾制粒法具体为将球磨好的混合浆料卸出球磨机后经预搅拌,随后经泵送入喷雾塔内,喷雾塔内通过被加热的氮气加热雾化浆料,所述喷雾塔的塔入口温度130-250℃,塔出口温度90-110℃,塔内压力为1.6-2.4kpa,分离器压力差为0.6-1.6kpa,塔内氧含量≤0.9%。
进一步的,模压成型过程中压制成型坯所用的模具的收缩系数为1.18-1.20。
进一步的,所述步骤d中采用过压烧结,烧结温度为1450-1480℃,烧结压力5.5-10Mpa。过压烧结是高温下采用高压氩气对烧结体采用压力烧结措施,有利于合金气孔的消除,提高合金的致密度,进而提高合金的耐磨性和抗弯强度。
进一步的,对烧结后的制品进行深冷回温处理,所述深冷回温处理为:将烧结后的制品在-180--200℃下深冷2H-2.5H,然后置于180-200℃下回温2H-2.5H。材料经深冷处理后内部热应力和机械应力大为降低,并且由于降温的过程中会使微孔或应力集中部位产生了塑性流变,而在升温过程中会在此类空位表面产生压应变,这种压应力可以大大减轻缺陷对工件局部性能的损害,从而有效地减少了工件产生的变形、开裂的可能性,进而提高了工件的使用寿命。
进一步的,所述钝化抛光处理具体为:所述钝化抛光处理具体为:抛料与球齿质量比:2-4:1,钝化抛光机的转速30-50r/min,钝化抛光时间5-12H。
本发明所产生的有益效果包括:本发明通过在Co粉中添加TaC,减少三相析出的可能,提高合金的强度,提高产品的热稳定性。通过过压烧结在高压氩气下对烧结体采用压力烧结措施,有利于合金气孔的消除,提高合金的致密度,进而提高合金的耐磨性和抗弯强度。通过对材料经深冷处理,使内部热应力和机械应力大为降低,并且由于降温的过程中会使微孔或应力集中部位产生了塑性流变,而在升温过程中会在此类空位表面产生压应变,这种压应力可以大大减轻缺陷对工件局部性能的损害,从而有效地减少了工件产生的变形、开裂的可能性,进而提高了工件的使用寿命。
本发明通过原料选材,球磨工艺,喷雾干燥制得混合料,混合料压制成型、过压烧结、表面处理后得合金球齿,合金耐磨性表现较好,钻超硬岩石300米以上,而在改善之前,地矿球齿钻超硬岩层仅为100-150米。
具体实施方式
下面结合具体实施例对本发明做进一步详细的解释说明,但应当理解为本发明的保护范围并不受具体实施例的限制。
实施案例1:
按质量份数计,将92份WC,8份钴粉(钴粉中含5%TaC),35份酒精,300份Φ6合金球放入滚筒球磨机内混合球磨,球磨机转速38r/min,球磨时间16H,随后料浆进入喷雾塔内喷雾制粒,塔入口温度130℃,出口温度110℃,塔内温度1.6kpa,分离器压力差0.6kpa,喷雾完成后模压成型,模具收缩系数1.18,得压制毛坯,毛坯热压烧结,烧结温度1450℃,烧结压力10MPa,烧结体-200℃下深冷2H,回温到180℃,保持2.5H,随后放入钝化抛光机内抛光,抛料与球齿质量比4:1,得合金球齿,合金球齿钻超硬岩层304米。
实施案例2:
按质量份数计,将94份WC,6份钴粉(钴粉中含3%TaC),27份酒精,150份Φ6合金球放入滚筒球磨机内混合球磨,球磨机转速30r/min,球磨时间32H,随后料浆进入喷雾塔内喷雾制粒,塔入口温度250℃,出口温度90℃,塔内温度2.4kpa,分离器压力差1.6kpa,喷雾完成后模压成型,模具收缩系数1.20,得压制毛坯,毛坯热压烧结,烧结温度1480℃,烧结压力5.5MPa,烧结体-180℃下深冷2.5H,回温到200℃,保持2H,随后放入钝化抛光机内抛光,抛料与球齿质量比2:1,得合金球齿,钻超硬岩层326米。
实施案例3:
按质量份数计,将93份WC,7份钴粉(钴粉中含4%TaC),30份酒精,250份Φ6合金球放入滚筒球磨机内混合球磨,球磨机转速34r/min,球磨时间24H,随后料浆进入喷雾塔内喷雾制粒,塔入口温度200℃,出口温度100℃,塔内温度2kpa,分离器压力差1.0kpa,喷雾完成后模压成型,模具收缩系数1.19,得压制毛坯,毛坯热压烧结,烧结温度1460℃,烧结压力8MPa,烧结体-190℃下深冷2.2H,回温到190℃,保持2H,随后放入钝化抛光机内抛光,抛料与球齿质量比3:1,得合金球齿,钻超硬岩层340米。
上述仅为本发明的优选实施例,本发明并不仅限于实施例的内容。对于本领域中的技术人员来说,在本发明的技术方案范围内可以有各种变化和更改,所作的任何变化和更改,均在本发明保护范围之内。
Claims (9)
1.一种地矿球齿的制备方法,其特征在于:包括
a 配料球磨,原料包括WC粉和Co粉,所述Co粉中掺杂有TaC,向所述原料中添加酒精后置于球磨机中球磨得到混合浆料;
b 将所述混合浆料采用喷雾制粒法制粒得到混合粒料;
c 对所述混合粒料进行模压成型得到成型体;
d 对所述成型体进行烧结后得到制品;
e 对所述制品进行表面钝化抛光处理得到地矿球齿。
2.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述原料中包括如下质量份数:
WC粉 92~94份;
Co粉 6~8份;
其中所述Co粉中掺杂有Co粉总质量3%-5%的TaC。
3.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述球磨机中加入27-35份酒精,150-300份Φ6合金球。
4.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述球磨机在球磨时转速30-38r/min,球磨时间16-32H。
5.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述喷雾制粒法具体为将球磨好的混合浆料卸出球磨机后经预搅拌,随后经泵送入喷雾塔内,喷雾塔内通过被加热的氮气加热雾化浆料,所述喷雾塔的塔入口温度130-250℃,塔出口温度90-110℃,塔内压力为1.6-2.4kpa,分离器压力差为0.6-1.6kpa,塔内氧含量≤0.9%。
6.根据权利要求1所述的地矿球齿的制备方法,其特征在于:模压成型过程中压制成型坯所用的模具的收缩系数为1.18-1.20。
7.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述步骤d中采用过压烧结,烧结温度为1450-1480℃,烧结压力5.5-10Mpa。
8.根据权利要求1所述的地矿球齿的制备方法,其特征在于:对烧结后的制品进行深冷回温处理,所述深冷回温处理为:将烧结后的制品在-180--200℃深冷2H-2.5H,然后置于180-200℃下回温2H-2.5H。
9.根据权利要求1所述的地矿球齿的制备方法,其特征在于:所述钝化抛光处理具体为:抛料与球齿质量比:2-4:1,钝化抛光机的转速30-50r/min,钝化抛光时间5-12H。
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CN108941548A (zh) * | 2018-08-09 | 2018-12-07 | 蓬莱市超硬复合材料有限公司 | 一种硬质合金球齿的制备工艺 |
CN110499443A (zh) * | 2019-08-29 | 2019-11-26 | 昆山长鹰硬质合金有限公司 | 一种高性能模具材料及其制备方法 |
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