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CN110000376B - A kind of nickel-molybdenum-chromium-diamond alloy composite powder and its preparation method and use - Google Patents

A kind of nickel-molybdenum-chromium-diamond alloy composite powder and its preparation method and use Download PDF

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CN110000376B
CN110000376B CN201910428842.XA CN201910428842A CN110000376B CN 110000376 B CN110000376 B CN 110000376B CN 201910428842 A CN201910428842 A CN 201910428842A CN 110000376 B CN110000376 B CN 110000376B
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diamond
nickel
molybdenum
chromium
alloy
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CN110000376A (en
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沈承金
祖文杰
陈正
陶庆
吉喆
张平
任宣儒
张金勇
何业增
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KUNSHAN SERGERNT EQUIPMENT INDUSTRY CO LTD
China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention discloses nickel-molybdenum-chromium-diamond alloy composite powder and a preparation method and application thereof, belonging to the field of diamond composite material processing. The nickel-molybdenum-chromium-diamond alloy composite powder comprises the following components in percentage by mass: 35-60% of diamond, 9.2-17.6% of Mo, 3.6-9.4% of Cr, 0.2-0.65% of Fe, 0.2-0.65% of Co and the balance of Ni. The diamond alloy powder provided by the invention provides a composite powder material with excellent anti-corrosion, wear-resistant and anti-oxidation functions for 3D printing, thermal spraying, powder metallurgy, hot-pressing sintering and the like.

Description

一种镍钼铬-金刚石合金复合粉末及其制备方法和用途A kind of nickel-molybdenum-chromium-diamond alloy composite powder and its preparation method and use

技术领域technical field

本发明属于金属粉末材料技术及先进制造应用领域，具体涉及镍钼铬-金刚石合金复合粉末材料技术，主要用于高速热喷涂、热压烧结和3D打印成型等。The invention belongs to the field of metal powder material technology and advanced manufacturing application, and specifically relates to a nickel-molybdenum-chromium-diamond alloy composite powder material technology, which is mainly used for high-speed thermal spraying, hot pressing sintering, 3D printing and the like.

背景技术Background technique

金刚石材料在超硬领域应用越来越广泛，金刚石刀具、工具、磨料均成为工业技术不可缺少的产品技术，金刚石当前的应用主要局限于镀层和小体积块体材料，如CVD金刚石镀膜刀具、钻头、切割具，金刚石砂带，金刚石粉末和胶粘接固结制造的金刚石涂层砂轮片，或硬度测量用金刚石压头等。基于金刚石自身硬度高和性脆，作为整体材料应用，既不经济也不耐用。Diamond materials are more and more widely used in the superhard field. Diamond cutting tools, tools, and abrasives have become indispensable product technologies in industrial technology. The current application of diamond is mainly limited to coatings and small-volume bulk materials, such as CVD diamond coated cutting tools and drill bits. , cutting tools, diamond belts, diamond powder and adhesive bonding of diamond-coated grinding wheels, or diamond indenters for hardness measurement, etc. Due to the high hardness and brittleness of diamond itself, it is neither economical nor durable when used as a monolithic material.

为了获得更高的耐磨性能和超硬材料，科技人员从硬质合金、金属碳化物材料、金属氧化物材料，金属硼化物等逐渐关注金刚石或类金刚石材料，金刚石镀膜、涂层和整体金刚石复合材料越来越受到关注，发明专利CN109234593A一种金刚石/铜基复合材料及其制备方法介绍了45-55％(wt)金刚石粉末与铜钛粉末(Ti含量0.5-2.0％)进行球磨混合，放电等离子热压烧结铜基金刚石整体块体材料。In order to obtain higher wear resistance and superhard materials, scientific and technical personnel gradually pay attention to diamond or diamond-like materials, diamond coatings, coatings and solid diamonds from cemented carbide, metal carbide materials, metal oxide materials, metal borides, etc. More and more attention has been paid to composite materials. Invention patent CN109234593A, a diamond/copper matrix composite material and its preparation method, introduces 45-55% (wt) diamond powder and copper-titanium powder (Ti content: 0.5-2.0%) for ball milling and mixing, Spark plasma hot pressing sintered copper-based diamond monolithic bulk material.

但是，金刚石性能脆性，成型方法单一，应用面受限。本发明镍钼铬-金刚石合金复合粉末，以满足通过高速热喷涂、激光3D打印、热压烧结等方法制造超硬的耐磨耐蚀机械零部件产品。However, the diamond properties are brittle, the forming method is single, and the application area is limited. The nickel-molybdenum-chromium-diamond alloy composite powder of the present invention can meet the requirements of manufacturing superhard wear-resistant and corrosion-resistant mechanical parts products by high-speed thermal spraying, laser 3D printing, hot pressing sintering and other methods.

但是，金刚石材料具有成型表面脆性，与金属润湿性差，自身熔点高的特点，无法通过金属熔化方法获得材料成型不足的缺点。However, the diamond material has the characteristics of brittle molding surface, poor wettability with metal, and high melting point.

发明内容SUMMARY OF THE INVENTION

鉴于金刚石材料性能脆性，与金属润湿性差，自身熔点高的特点，无法通过金属熔化方法获得材料成型不足的缺点。为实现金刚石应用范围扩大，本发明的目的是提供一种金刚石复合粉末，该粉末由低熔点金属相包覆高熔点的金刚石相组成复合颗粒，再通过复合颗粒的低熔点粘结相互相粘结，实现金刚石颗粒均匀分散在金属粘结相中的复合金刚石材料或涂层。In view of the brittleness of diamond material, poor wettability with metal, and high melting point, the shortcomings of insufficient material forming cannot be obtained by metal melting method. In order to realize the expansion of diamond application range, the purpose of the present invention is to provide a kind of diamond composite powder. , to achieve a composite diamond material or coating in which the diamond particles are uniformly dispersed in the metal binder phase.

为实现上述目的，本发明采用的技术方案为：To achieve the above object, the technical scheme adopted in the present invention is:

一种镍钼铬-金刚石合金复合粉末按照质量百分含量，其由以下组分组成：35～60％的金刚石、9.2～17.6％的Mo、3.6～9.4％的Cr、0.2～0.65％的Fe、0.2～0.65％的Co、余量为Ni。A nickel-molybdenum-chromium-diamond alloy composite powder is composed of the following components according to mass percentage: 35-60% diamond, 9.2-17.6% Mo, 3.6-9.4% Cr, 0.2-0.65% Fe , 0.2 to 0.65% of Co, the balance being Ni.

进一步的，所述镍钼铬-金刚石合金复合粉末由核壳结构的球形颗粒或不规则颗粒组成，其外层为镍钼铬合金粘结相，内核为多个互不相连的金刚石颗粒，镍钼铬合金粘结相包覆多个互不相连的金刚石颗粒，且每个金刚石颗粒上均包覆镍钼铬合金粘结相。Further, the nickel-molybdenum-chromium-diamond alloy composite powder is composed of spherical particles or irregular particles with a core-shell structure, the outer layer is a nickel-molybdenum-chromium alloy binder phase, the inner core is a plurality of disconnected diamond particles, and the nickel The molybdenum-chromium alloy binder phase covers a plurality of diamond particles that are not connected to each other, and each diamond particle is covered with a nickel-molybdenum-chromium alloy binder phase.

按照质量百分含量，所述镍钼铬合金粘结相的组成为：23.0～27.0％Mo、9.0～14.5％Cr、0.5～1.0％Fe、0.5～1.0％Co、余量为Ni。According to the mass percentage content, the composition of the nickel-molybdenum-chromium alloy binder phase is: 23.0-27.0% Mo, 9.0-14.5% Cr, 0.5-1.0% Fe, 0.5-1.0% Co, and the balance is Ni.

本发明的镍钼铬-金刚石合金复合粉末由以下3中方法的任一一种制备得到：The nickel-molybdenum-chromium-diamond alloy composite powder of the present invention is prepared by any one of the following 3 methods:

方法a，一种镍钼铬-金刚石合金复合粉末的制备方法，包括以下步骤：Method a, a preparation method of nickel-molybdenum-chromium-diamond alloy composite powder, comprising the following steps:

步骤a1，以铬镍、钼铁、钴合金为原料，加入真空熔炼炉进行熔炼，熔炼出NiMoCr粘结相合金熔融体；Step a1, using chromium-nickel, molybdenum-iron, and cobalt alloys as raw materials, adding the vacuum melting furnace for melting, and melting the NiMoCr binder phase alloy melt;

步骤a2，将金刚石颗粒与步骤a1得到的NiMoCr粘结相合金熔融体混合成为高温熔融熔体，经Ar雾化获得镍钼铬-金刚石合金复合粉末。In step a2, the diamond particles are mixed with the NiMoCr binder phase alloy melt obtained in step a1 to form a high-temperature molten melt, and the NiMoCr-diamond alloy composite powder is obtained by Ar atomization.

方法b，一种镍钼铬-金刚石合金复合粉末的制备方法，包括以下步骤：Method b, a preparation method of nickel-molybdenum-chromium-diamond alloy composite powder, comprising the following steps:

步骤b1，以铬镍、钼铁、钴合金为原料，加入真空熔炼炉进行熔炼，熔化温度为1460℃,熔炼出NiMoCr粘结相合金熔融体，经氩气喷吹雾化为NiMoCr基合金粉末；Step b1, using chromium-nickel, molybdenum-iron, and cobalt alloys as raw materials, adding them to a vacuum melting furnace for melting at a melting temperature of 1460° C. to obtain a NiMoCr binder phase alloy melt, which is sprayed and atomized into NiMoCr-based alloy powder by argon gas. ;

步骤b2，将金刚石颗粒与NiMoCr基合金粉末混合，进行真空球磨混合，随后进行气氛热等静压烧结成金刚石-镍钼铬合金棒料；In step b2, the diamond particles are mixed with the NiMoCr-based alloy powder, and mixed by vacuum ball milling, and then subjected to atmospheric hot isostatic pressing to sinter into a diamond-nickel-molybdenum-chromium alloy bar;

步骤b3，将步骤2得到的金刚石-镍钼铬合金棒料在EIGA真空感应熔炼炉进行熔炼，以高纯氩气对熔融的金刚石-镍钼铬合金液滴进行喷吹雾化，冷却筛分得到金刚石-镍钼铬合金复合粉末。Step b3, smelting the diamond-nickel-molybdenum-chromium alloy bar obtained in step 2 in an EIGA vacuum induction melting furnace, spraying and atomizing the molten diamond-nickel-molybdenum-chromium alloy droplets with high-purity argon, cooling and screening The diamond-nickel-molybdenum-chromium alloy composite powder was obtained.

方法c，一种镍钼铬-金刚石合金复合粉末的制备方法，包括以下步骤：Method c, a preparation method of nickel-molybdenum-chromium-diamond alloy composite powder, comprising the following steps:

步骤c1，以铬镍、钼铁、钴合金为原料，加入真空熔炼炉进行熔炼，熔炼出NiMoCr粘结相合金熔融体，经氩气喷吹雾化为NiMoCr基合金粉末；Step c1, using chromium-nickel, molybdenum-iron, and cobalt alloys as raw materials, adding it to a vacuum melting furnace for melting, melting NiMoCr binder phase alloy melt, and spraying and atomizing it with argon into NiMoCr-based alloy powder;

步骤c2，将金刚石颗粒与镍钼铬合金粉末混合，加热无水乙醇进行球磨混合，将聚乙烯醇和羧甲基纤维素的混合物，金刚石和镍钼铬粉末球磨粉末相混合制成浆状物，并进行离心喷雾干燥制粒；Step c2, mixing diamond particles with nickel-molybdenum-chromium alloy powder, heating absolute ethanol for ball-milling mixing, mixing the mixture of polyvinyl alcohol and carboxymethyl cellulose, diamond and nickel-molybdenum-chromium powder ball milling powder to form a slurry, And carry out centrifugal spray drying granulation;

步骤c3，对制粒的金刚石-NiMoCr的合金粉末进行烧结，烧结温度890～1100℃，再经冷却、筛分获得包覆金刚石-镍钼铬合金复合粉末。Step c3, sintering the granulated diamond-NiMoCr alloy powder at a sintering temperature of 890-1100° C., and then cooling and sieving to obtain a coated diamond-NiMoCr alloy composite powder.

本发明的镍钼铬-金刚石合金复合粉末的用途，能够用于以下几个方面：The purposes of the nickel-molybdenum-chromium-diamond alloy composite powder of the present invention can be used in the following aspects:

(1)用于超音速火焰喷涂、等离子喷涂、激光喷涂用粉末；(1) Powder for supersonic flame spraying, plasma spraying and laser spraying;

(2)用于热等静压烧结、热压烧结用粉末；(2) Powder for hot isostatic pressing and hot pressing sintering;

(3)用于激光3D打印用合金粉末。(3) Alloy powder for laser 3D printing.

本发明的有益效果是：本发明提供的一种镍钼铬-金刚石合金复合粉末，金刚石材料熔点4000℃以上，粘结相镍钼铬合金的熔点只有900～1380℃，这样仅需要在较低的粘结相熔点的温度范围内就可以制备含35～60％(wt)金刚石成分的金刚石涂层或整体零件，金刚石颗粒由冶金结合的金属粘结相固定，机械性能优良。为CVD金刚石镀膜、无机粘结金刚石涂层应用之外又拓宽新的渠道。The beneficial effects of the invention are as follows: the nickel-molybdenum-chromium-diamond alloy composite powder provided by the invention has the melting point of the diamond material above 4000°C, and the melting point of the bonding phase nickel-molybdenum-chromium alloy is only 900-1380°C. Within the temperature range of the melting point of the binder phase, diamond coatings or integral parts containing 35-60% (wt) diamond components can be prepared. The diamond particles are fixed by the metal binder phase bonded by metallurgy, and the mechanical properties are excellent. In addition to the application of CVD diamond coating and inorganic bonded diamond coating, new channels are broadened.

具体实施方式Detailed ways

本发明的镍钼铬-金刚石合金复合粉末按照质量百分含量，其由以下组分组成：35～60％的金刚石、9.2～17.6％的Mo、3.6～9.4％的Cr、0.2～0.65％的Fe、0.2～0.65％的Co、余量为Ni。The nickel-molybdenum-chromium-diamond alloy composite powder of the present invention is composed of the following components according to the mass percentage: 35-60% diamond, 9.2-17.6% Mo, 3.6-9.4% Cr, 0.2-0.65% Fe, 0.2 to 0.65% of Co, and the balance Ni.

其中，镍钼铬-金刚石合金复合粉末由核壳结构的球形颗粒或不规则颗粒组成，其外层为镍钼铬合金粘结相，内核为多个互不相连的金刚石颗粒，镍钼铬合金粘结相包覆多个互不相连的金刚石颗粒，且每个金刚石颗粒上均包覆镍钼铬合金粘结相。Among them, the nickel-molybdenum-chromium-diamond alloy composite powder is composed of spherical particles or irregular particles with a core-shell structure, the outer layer is a nickel-molybdenum-chromium alloy binder phase, the inner core is a plurality of diamond particles that are not connected to each other, and the nickel-molybdenum-chromium alloy The binder phase covers a plurality of diamond particles that are not connected to each other, and each diamond particle is covered with a nickel-molybdenum-chromium alloy binder phase.

对于镍钼铬合金粘结相，其是合金成分，不论复合粉末中金刚石的占比是35％还是60％，镍钼铬合金粘结相的成分均不变；按照质量百分含量，所述镍钼铬合金粘结相的组成为：23.0～27.0％Mo、9.0～14.5％Cr、0.5～1.0％Fe、0.5～1.0％Co、余量为Ni。For the nickel-molybdenum-chromium alloy binder phase, which is an alloy component, regardless of whether the proportion of diamond in the composite powder is 35% or 60%, the composition of the nickel-molybdenum-chromium alloy binder phase remains unchanged; according to the mass percentage, the said The composition of the nickel-molybdenum-chromium alloy binder phase is: 23.0-27.0% Mo, 9.0-14.5% Cr, 0.5-1.0% Fe, 0.5-1.0% Co, and the balance is Ni.

下面结合一些具体实施例对本发明作更进一步的说明。The present invention will be further described below in conjunction with some specific embodiments.

实施例1：Example 1:

按照NiMoCr粘结相合金成分要求，将铬镍、钼铁、钴等合金加入真空熔炼炉进行熔炼，熔化温度为1460℃,熔炼出NiMoCr粘结相合金熔融体，将金刚石颗粒与NiMoCr粘结相合金熔融体按35:65的质量比进行混合成为高温熔融熔体，经Ar雾化获得镍钼铬-金刚石合金复合粉末，按照质量百分含量，其组成为：35.00％金刚石、17.6％Mo、9.4％Cr、0.65％Fe、0.65％Co和余量的Ni。该复合合金粉末的金刚石颗粒为不规则颗粒，镍钼铬合金粘结相包覆多个金刚石颗粒的复合结构，复合粉末形状为球形。According to the composition requirements of NiMoCr binder phase alloy, chromium-nickel, molybdenum iron, cobalt and other alloys are added to the vacuum melting furnace for melting, the melting temperature is 1460 ℃, and the NiMoCr binder phase alloy melt is smelted. The alloy melt is mixed at a mass ratio of 35:65 to become a high-temperature melt, and is atomized by Ar to obtain a nickel-molybdenum-chromium-diamond alloy composite powder. According to the mass percentage, its composition is: 35.00% diamond, 17.6% Mo, 9.4% Cr, 0.65% Fe, 0.65% Co and balance Ni. The diamond particles of the composite alloy powder are irregular particles, the nickel-molybdenum-chromium alloy bonding phase covers a composite structure of a plurality of diamond particles, and the composite powder is spherical in shape.

实施例2：Example 2:

按照NiMoCr粘结相合金成分要求，将铬镍、钼铁、钴等合金加入真空熔炼炉进行熔炼，熔化温度为1460℃,熔炼出NiMoCr粘结相合金熔融体，经氩气喷吹雾化为NiMoCr基合金粉末；将金刚石颗粒与NiMoCr基合金粉末按60:40质量比进行真空球磨混合，随后进行气氛热等静压烧结成金刚石-镍钼铬合金棒料，烧结温度1280±20℃，压力为165Mpa，保护气氛为氩气，金刚石-镍钼铬合金棒料在EIGA真空感应熔炼炉进行熔炼，以高纯氩气对熔融的金刚石-镍钼铬合金液滴进行喷吹雾化，感应熔炼电流650A，氩气速度1100m/s，冷却筛分达到金刚石-镍钼铬合金复合粉末，按照质量百分含量，其组成为：60.00％金刚石、9.2％Mo、3.6％Cr、0.2％Fe、0.2％Co和余量的Ni。该复合合金粉末的金刚石颗粒为类球状颗粒，镍钼铬合金粘结相包覆多个金刚石颗粒的复合结构，复合粉末形状为球形。According to the composition requirements of NiMoCr binder phase alloy, chromium-nickel, molybdenum iron, cobalt and other alloys are added to the vacuum melting furnace for melting, the melting temperature is 1460 ℃, and the NiMoCr binder phase alloy melt is smelted, which is sprayed and atomized by argon into NiMoCr-based alloy powder; the diamond particles and NiMoCr-based alloy powder are mixed by vacuum ball milling at a mass ratio of 60:40, and then subjected to atmospheric hot isostatic pressing to sinter into diamond-nickel-molybdenum-chromium alloy bars, sintering temperature 1280±20℃, pressure It is 165Mpa, the protective atmosphere is argon, the diamond-nickel-molybdenum-chromium alloy bar is smelted in the EIGA vacuum induction melting furnace, and the molten diamond-nickel-molybdenum-chromium alloy droplets are sprayed and atomized with high-purity argon, and induction melting is carried out. The current is 650A, the argon gas velocity is 1100m/s, and the cooling and screening reaches the diamond-nickel-molybdenum-chromium alloy composite powder. According to the mass percentage, its composition is: 60.00% diamond, 9.2% Mo, 3.6% Cr, 0.2% Fe, 0.2% %Co and balance Ni. The diamond particles of the composite alloy powder are spherical-like particles, a composite structure in which a nickel-molybdenum-chromium alloy bonding phase coats a plurality of diamond particles, and the composite powder is spherical in shape.

实施例3：Example 3:

按照NiMoCr粘结相合金成分要求，将铬镍、钼铁、钴等合金加入真空熔炼炉进行熔炼，熔化温度为1460℃,熔炼出NiMoCr粘结相合金熔融体，经氩气喷吹雾化为NiMoCr基合金粉末；将金刚石颗粒与NiMoCr基合金粉末按质量百分比50:50混合，加热无水乙醇进行球磨混合，将45wt％的聚乙烯醇和羧甲基纤维素按2.5:1.5比例的混合物，55wt％的金刚石和镍钼铬粉末球磨粉末相混合制成浆状物，并进行离心喷雾干燥制粒，对制粒的金刚石-NiMoCr的合金粉末进行烧结，烧结温度890～1100℃，再经冷却、筛分获得包覆金刚石-镍钼铬合金复合粉末，按照质量百分含量，其组成为：50.00％金刚石、12.13％Mo、7.2％Cr、0.25％Fe、0.5％Co和余量的Ni。该复合合金粉末的金刚石颗粒为类球状颗粒，镍钼铬合金粘结相包覆多个金刚石颗粒的复合结构，复合粉末形状为球形。According to the composition requirements of NiMoCr binder phase alloy, chromium-nickel, molybdenum iron, cobalt and other alloys are added to the vacuum melting furnace for melting, the melting temperature is 1460 ℃, and the NiMoCr binder phase alloy melt is smelted, which is sprayed and atomized by argon into NiMoCr-based alloy powder; mix diamond particles and NiMoCr-based alloy powder in a mass percentage of 50:50, heat anhydrous ethanol for ball milling, and mix 45wt% polyvinyl alcohol and carboxymethyl cellulose in a ratio of 2.5:1.5, 55wt% % diamond and nickel-molybdenum-chromium powder ball-milled powder are mixed into a slurry, and centrifugal spray drying is carried out to granulate, and the granulated diamond-NiMoCr alloy powder is sintered at a sintering temperature of 890-1100 ° C, and then cooled, The coated diamond-nickel-molybdenum-chromium alloy composite powder is obtained by sieving, and its composition is: 50.00% diamond, 12.13% Mo, 7.2% Cr, 0.25% Fe, 0.5% Co and the balance of Ni according to the mass percentage content. The diamond particles of the composite alloy powder are spherical-like particles, a composite structure in which a nickel-molybdenum-chromium alloy bonding phase coats a plurality of diamond particles, and the composite powder is spherical in shape.

实施例4：Example 4:

按照与实施例1相同的方法，制备金刚石颗粒与NiMoCr粘结相合金质量比为40:60的镍钼铬-金刚石合金复合粉末，得到的镍钼铬-金刚石合金复合粉末的组成为：40.00％金刚石、16.2％Mo、8.2％Cr、0.6％Fe、0.4％Co和余量的Ni。该复合合金粉末的金刚石颗粒为不规则颗粒，镍钼铬合金粘结相包覆多个金刚石颗粒的复合结构，复合粉末形状为球形。According to the same method as in Example 1, a nickel-molybdenum-chromium-diamond alloy composite powder with a mass ratio of diamond particles and NiMoCr binder phase alloy of 40:60 was prepared, and the composition of the obtained nickel-molybdenum-chromium-diamond alloy composite powder was: 40.00% Diamond, 16.2% Mo, 8.2% Cr, 0.6% Fe, 0.4% Co and balance Ni. The diamond particles of the composite alloy powder are irregular particles, the nickel-molybdenum-chromium alloy bonding phase covers a composite structure of a plurality of diamond particles, and the composite powder is spherical in shape.

实施例5：Example 5:

按照与实施例2相同的方法，制备金刚石颗粒与NiMoCr粘结相合金质量比为60:40的镍钼铬-金刚石合金复合粉末，得到的镍钼铬-金刚石合金复合粉末的组成为：45.0％金刚石、14.2％Mo、6.6％Cr、0.4％Fe、0.3％Co和余量的Ni。该复合合金粉末的金刚石颗粒为不规则颗粒，镍钼铬合金粘结相包覆多个金刚石颗粒的复合结构，复合粉末形状为球形。According to the same method as in Example 2, a nickel-molybdenum-chromium-diamond alloy composite powder with a mass ratio of diamond particles and NiMoCr binder phase alloy of 60:40 was prepared, and the composition of the obtained nickel-molybdenum-chromium-diamond alloy composite powder was: 45.0% Diamond, 14.2% Mo, 6.6% Cr, 0.4% Fe, 0.3% Co and balance Ni. The diamond particles of the composite alloy powder are irregular particles, the nickel-molybdenum-chromium alloy bonding phase covers a composite structure of a plurality of diamond particles, and the composite powder is spherical in shape.

以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (5)

1. The nickel-molybdenum-chromium-diamond alloy composite powder is characterized by comprising the following components in parts by weight: the composition comprises the following components in percentage by mass: 35-60% of diamond, 9.2-17.6% of Mo, 3.6-9.4% of Cr, 0.2-0.65% of Fe, 0.2-0.65% of Co and the balance of Ni;
the nickel-molybdenum-chromium-diamond alloy composite powder consists of spherical particles or irregular particles with a core-shell structure, wherein the outer layer of the nickel-molybdenum-chromium alloy composite powder is a nickel-molybdenum-chromium alloy bonding phase, the inner core of the nickel-molybdenum-chromium alloy composite powder is a plurality of diamond particles which are not connected with each other, the nickel-molybdenum-chromium alloy bonding phase coats the plurality of diamond particles which are not connected with each other, and each diamond particle is coated with the nickel-molybdenum-chromium alloy bonding phase.
2. A method of preparing the nickel molybdenum chromium-diamond alloy composite powder of claim 1, characterized in that: the method comprises the following steps:
step a1, adding chromium-nickel, ferromolybdenum and cobalt alloy serving as raw materials into a vacuum smelting furnace for smelting to obtain NiMoCr bonding phase alloy molten mass;
step a2, mixing the diamond particles and the NiMoCr bonding phase alloy melt obtained in the step a1 into high-temperature melt, and carrying out Ar atomization to obtain the nickel-molybdenum-chromium-diamond alloy composite powder.
3. A method of preparing the nickel molybdenum chromium-diamond alloy composite powder of claim 1, characterized in that: the method comprises the following steps:
step b1, adding chromium-nickel, ferromolybdenum and cobalt alloy serving as raw materials into a vacuum smelting furnace for smelting, wherein the smelting temperature is 1460 ℃, smelting a NiMoCr bonding phase alloy molten mass, and atomizing into NiMoCr-based alloy powder through argon blowing;
step b2, mixing the diamond particles with NiMoCr-based alloy powder, carrying out vacuum ball milling and mixing, and then carrying out atmosphere hot isostatic pressing and sintering to obtain a diamond-nickel-molybdenum-chromium alloy bar;
and b3, smelting the diamond-nickel-molybdenum-chromium alloy bar obtained in the step 2 in an EIGA vacuum induction smelting furnace, carrying out blowing atomization on the molten diamond-nickel-molybdenum-chromium alloy liquid drops by using high-purity argon, cooling and screening to obtain the diamond-nickel-molybdenum-chromium alloy composite powder.
4. A method of preparing the nickel molybdenum chromium-diamond alloy composite powder of claim 1, characterized in that: the method comprises the following steps:
step b1, adding chromium-nickel, ferromolybdenum and cobalt alloy serving as raw materials into a vacuum smelting furnace for smelting, smelting NiMoCr bonding phase alloy melt, and atomizing into NiMoCr-based alloy powder through argon blowing;
step b2, mixing the diamond particles with nickel-molybdenum-chromium alloy powder, heating absolute ethyl alcohol for ball milling and mixing, mixing the mixture of polyvinyl alcohol and carboxymethyl cellulose, the diamond and nickel-molybdenum-chromium powder ball milling powder to prepare slurry, and carrying out centrifugal spray drying and granulation;
and b3, sintering the granulated diamond-NiMoCr alloy powder at the sintering temperature of 890-1100 ℃, and then cooling and screening to obtain the coated diamond-nickel-molybdenum-chromium alloy composite powder.
5. Use of the nickel molybdenum chromium-diamond alloy composite powder according to claim 1, characterized in that: the nickel molybdenum chromium-diamond alloy powder is used in several respects:
(1) powder for supersonic flame spraying, plasma spraying and laser spraying;
(2) powder for hot isostatic pressing sintering and hot press sintering;
(3) the alloy powder is used for laser 3D printing.
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