阅读说明：本技术 一种用于制备复杂形状钨铜复合材料坯体的工艺 (Process for preparing tungsten-copper composite material blank with complex shape ) 是由 蔡精敏 于 2021-08-25 设计创作，主要内容包括：本发明涉及钨铜复合工艺技术领域,且公开了一种用于制备复杂形状钨铜复合材料坯体的工艺,包括：将钨粉加入预混液中,并且将与钨粉等质量的球磨球一起加入预混液中,将铜粉加入预混液中,并且将与铜粉等质量的球磨球一起加入预混液中,充分混合后球磨,制得浆料；向浆料中加入引发剂过氧化苯甲酰和催化剂N,N-二甲基乙酰胺,搅拌均匀后迅速注模,把模具置于水浴锅中,有机单体发生凝胶化反应,生成三维网状结构,将钨粉和铜粉包裹其中,形成由高分子网络定型的坯体；经过脱模干燥,得到无变形无开裂的表面质量较好的钨铜复合材料坯体；本发明无需特殊的模具和专门的排胶设备,能以较低的成本成形大尺寸复杂形状零部件。(The invention relates to the technical field of tungsten-copper composite processes, and discloses a process for preparing a tungsten-copper composite material blank with a complex shape, which comprises the following steps: adding tungsten powder into the premixed liquid, adding ball-milling balls with the same mass as the tungsten powder into the premixed liquid, adding copper powder into the premixed liquid, adding the ball-milling balls with the same mass as the copper powder into the premixed liquid, fully mixing and ball-milling to prepare slurry; adding initiator benzoyl peroxide and catalyst N, N-dimethylacetamide into the slurry, stirring uniformly, quickly injecting into a mold, placing the mold in a water bath kettle, allowing organic monomer to carry out gelation reaction to generate a three-dimensional network structure, and wrapping tungsten powder and copper powder therein to form a blank shaped by a polymer network; obtaining a tungsten-copper composite material blank with good surface quality, no deformation and no cracking after demoulding and drying; the invention can form large-size parts with complex shapes at lower cost without special moulds and special glue discharging equipment.)

1. A process for preparing a tungsten-copper composite material blank with a complex shape is characterized by comprising the following steps:

step S1, hydroxyethyl methacrylate (HEMA) and a solvent toluene are mixed according to the equal volume ratio, and a dispersant oleic acid is added to prepare a premixed solution;

step S2, weighing tungsten (W) powder and copper (Cu) powder;

step S3, adding tungsten (W) powder into the premixed liquid, adding ball milling balls with the same mass as the tungsten (W) powder into the premixed liquid, fully mixing and then carrying out ball milling to obtain a first slurry;

step S4, adding copper (Cu) powder into the premixed liquid, adding ball milling balls with the same mass as the copper (Cu) powder into the premixed liquid, fully mixing and then carrying out ball milling to obtain a slurry II;

step S5, adding an initiator Benzoyl Peroxide (BPO) and a catalyst N, N-Dimethylacetamide (DMA) into the slurry II, stirring uniformly, quickly injecting into a mold, placing the mold into a water bath, allowing an organic monomer to carry out a gelation reaction to generate a three-dimensional network structure, and wrapping tungsten (W) powder and copper (Cu) powder therein to form a blank shaped by a polymer network;

and step S6, after demolding, drying at room temperature to prevent the blank from cracking or deforming due to internal stress generated by too fast drying, and then drying in a constant-temperature drying oven to obtain the tungsten-copper composite blank with good surface quality and no deformation or cracking.

2. The process for preparing a complex-shaped tungsten-copper composite material blank according to claim 1, wherein the mass ratio of the tungsten (W) powder to the copper (Cu) powder is 7: 3.

3. the process for preparing a complex-shaped tungsten-copper composite blank according to claim 2, wherein the solid content of the tungsten (W) powder and the copper (Cu) powder in the pre-mixed liquid is 40%.

4. The process for preparing the tungsten-copper composite material blank body with the complex shape according to claim 3, wherein the particle diameter of the tungsten (W) powder is 2.5-3.5 um, and the particle diameter of the copper (Cu) powder is 20.0-60.0 um.

Technical Field

The invention relates to the technical field of tungsten-copper composite processes, in particular to a process for preparing a tungsten-copper composite material blank with a complex shape.

Background

The tungsten-copper composite material is a pseudo alloy composed of tungsten (W) with high melting point and high hardness and copper (Cu) with high electric conductivity and heat conductivity, which are not mutually soluble. The tungsten-copper composite material has high strength, high hardness, good electric and thermal conductivity, low thermal expansion coefficient and high arc corrosion resistance, and is widely applied to the fields of national defense industry, aerospace, electronic information, machining and the like.

The preparation method of the existing tungsten-copper composite material mainly comprises a powder mixing-pressing sintering method, an infiltration method, an injection molding method and the like. The powder mixing-pressing sintering method and the infiltration method are difficult to form products with complex shapes, and subsequent machining must be assisted, so that the working procedures are complicated, the raw material waste is serious, and the production cost is high; although the injection molding method can form a product with a complex shape in a near net size, it is difficult to prepare a large-sized and complex-shaped part, and the cost of a glue discharging device and a mold is high.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a process for preparing a tungsten-copper composite material blank with a complex shape, so as to solve the technical problem that the existing preparation method of the tungsten-copper composite material is difficult to realize large-size parts with complex shapes.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme:

a process for preparing a tungsten-copper composite material blank with a complex shape comprises the following steps:

step S1, hydroxyethyl methacrylate (HEMA) and a solvent toluene are mixed according to the equal volume ratio, and a dispersant oleic acid is added to prepare a premixed solution;

step S2, weighing tungsten (W) powder and copper (Cu) powder;

step S3, adding tungsten (W) powder into the premixed liquid, adding ball milling balls with the same mass as the tungsten (W) powder into the premixed liquid, fully mixing and then carrying out ball milling to obtain a first slurry;

step S4, adding copper (Cu) powder into the premixed liquid, adding ball milling balls with the same mass as the copper (Cu) powder into the premixed liquid, fully mixing and then carrying out ball milling to obtain a slurry II;

step S5, adding an initiator Benzoyl Peroxide (BPO) and a catalyst N, N-Dimethylacetamide (DMA) into the slurry II, stirring uniformly, quickly injecting into a mold, placing the mold into a water bath, allowing an organic monomer to carry out a gelation reaction to generate a three-dimensional network structure, and wrapping tungsten (W) powder and copper (Cu) powder therein to form a blank shaped by a polymer network;

and step S6, after demolding, drying at room temperature to prevent the blank from cracking or deforming due to internal stress generated by too fast drying, and then drying in a constant-temperature drying oven to obtain the tungsten-copper composite blank with good surface quality and no deformation or cracking.

Further, the mass ratio of the tungsten (W) powder to the copper (Cu) powder is 7: 3.

further, the solid content of the tungsten (W) powder and the copper (Cu) powder in the pre-mixed liquid is 40%.

Furthermore, the particle size of the tungsten (W) powder is 2.5-3.5 um, and the particle size of the copper (Cu) powder is 20.0-60.0 um.

(III) advantageous technical effects

Compared with the prior art, the invention has the following beneficial technical effects:

according to the invention, tungsten (W) powder and copper (Cu) powder particles uniformly dispersed in the suspension are wrapped by the high-molecular organic matter and are fixed in situ to obtain a uniform blank compounded by the powder and the high-molecular polymer, a special die and special glue discharging equipment are not needed, large-size parts with complex shapes can be formed at low cost, and the prepared blank has excellent bending strength and has great advantages compared with the traditional forming process.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The raw materials used by the invention are tungsten (W) powder and copper (Cu) powder, and the main physical properties are as follows: the purity of tungsten (W) powder is 99.99%, the particle size is 2.5-3.5 um, and the tungsten (W) powder is similar to a sphere; the purity of copper (Cu) powder is 99.80%, the particle size is 20.0-60.0 um, and the copper (Cu) powder is dendritic;

other raw materials include: the organic monomer is hydroxyethyl methacrylate (HEMA), the solvent is toluene, the dispersant is oleic acid, the initiator is Benzoyl Peroxide (BPO), and the catalyst is N, N-Dimethylacetamide (DMA); the reagents are analytically pure;

the first embodiment is as follows:

a process for preparing a tungsten-copper composite material blank with a complex shape comprises the following steps:

step S1, hydroxyethyl methacrylate (HEMA) and a solvent toluene are mixed according to the equal volume ratio, and dispersant oleic acid is added to ensure that the mass concentration of the oleic acid in the mixed solution is 0.10 percent to prepare a premixed solution;

step S2, weighing tungsten (W) powder and copper (Cu) powder according to the mass ratio of 7:3, and enabling the solid content of the weighed tungsten (W) powder and copper (Cu) powder in the premixed liquid to be 40%;

step S3, adding tungsten (W) powder into the premixed liquid, adding ball milling balls with the same mass as the tungsten (W) powder into the premixed liquid, fully mixing, and performing ball milling for 10min to obtain a first slurry;

step S4, adding copper (Cu) powder into the premixed liquid, adding ball milling balls with the same mass as the copper (Cu) powder into the premixed liquid, fully mixing, and performing ball milling for 10min to obtain a slurry II;

step S5, adding an initiator Benzoyl Peroxide (BPO) and a catalyst N, N-Dimethylacetamide (DMA) into the slurry II to ensure that the mass concentration of the Benzoyl Peroxide (BPO) in the slurry is 0.3% and the mass concentration of the N, N-Dimethylacetamide (DMA) in the slurry is 0.3%, stirring uniformly, quickly injecting the mixture into a mold, placing the mold into a water bath kettle at 50 ℃, carrying out gelation reaction on an organic monomer to generate a three-dimensional network structure, and wrapping tungsten (W) powder and copper (Cu) powder in the three-dimensional network structure to form a blank shaped by a polymer network;

step S6, after demolding, drying for 6 hours at room temperature to prevent the blank from cracking or deforming due to internal stress generated by too fast drying, and then drying for 5 hours in a constant-temperature drying oven at 100 ℃ to obtain a tungsten-copper composite blank with good surface quality and no deformation or cracking;

example two:

a process for preparing a tungsten-copper composite material blank with a complex shape comprises the following steps:

step S1, hydroxyethyl methacrylate (HEMA) and a solvent toluene are mixed according to the equal volume ratio, and dispersant oleic acid is added to ensure that the mass concentration of the oleic acid in the mixed solution is 0.15 percent to prepare a premixed solution;

step S2, weighing tungsten (W) powder and copper (Cu) powder according to the mass ratio of 7:3, and enabling the solid phase content of the weighed tungsten (W) powder and copper (Cu) powder in the premixed liquid to be 45%;

step S3, adding tungsten (W) powder into the premixed liquid, adding ball milling balls with the same mass as the tungsten (W) powder into the premixed liquid, fully mixing, and performing ball milling for 5min to obtain a first slurry;

step S4, adding copper (Cu) powder into the premixed liquid, adding ball milling balls with the same mass as the copper (Cu) powder into the premixed liquid, fully mixing, and performing ball milling for 15min to obtain a slurry II;

step S5, adding an initiator Benzoyl Peroxide (BPO) and a catalyst N, N-Dimethylacetamide (DMA) into the slurry II to ensure that the mass concentration of the Benzoyl Peroxide (BPO) in the slurry is 0.5% and the mass concentration of the N, N-Dimethylacetamide (DMA) in the slurry is 0.3%, stirring uniformly, quickly injecting the mixture into a mold, placing the mold into a water bath kettle at 55 ℃, carrying out gelation reaction on an organic monomer to generate a three-dimensional network structure, and wrapping tungsten (W) powder and copper (Cu) powder in the three-dimensional network structure to form a blank shaped by a polymer network;

step S6, after demolding, drying for 10 hours at room temperature to prevent the blank from cracking or deforming due to internal stress generated by too fast drying, and then drying for 8 hours in a constant-temperature drying oven at 100 ℃ to obtain a tungsten-copper composite blank with good surface quality and no deformation or cracking;

example three:

a process for preparing a tungsten-copper composite material blank with a complex shape comprises the following steps:

step S1, hydroxyethyl methacrylate (HEMA) and a solvent toluene are mixed according to the equal volume ratio, and dispersant oleic acid is added to ensure that the mass concentration of the oleic acid in the mixed solution is 0.2 percent to prepare a premixed solution;

step S2, weighing tungsten (W) powder and copper (Cu) powder according to the mass ratio of 7:3, and enabling the solid phase content of the weighed tungsten (W) powder and copper (Cu) powder in the premixed liquid to be 50%;

step S3, adding tungsten (W) powder into the premixed liquid, adding ball milling balls with the same mass as the tungsten (W) powder into the premixed liquid, fully mixing, and performing ball milling for 10min to obtain a first slurry;

step S4, adding copper (Cu) powder into the premixed liquid, adding ball milling balls with the same mass as the copper (Cu) powder into the premixed liquid, fully mixing, and performing ball milling for 15min to obtain a slurry II;

step S5, adding an initiator Benzoyl Peroxide (BPO) and a catalyst N, N-Dimethylacetamide (DMA) into the slurry II to ensure that the mass concentration of the Benzoyl Peroxide (BPO) in the slurry is 0.8% and the mass concentration of the N, N-Dimethylacetamide (DMA) in the slurry is 0.3%, stirring uniformly, quickly injecting the mixture into a mold, placing the mold into a water bath kettle at 60 ℃, carrying out gelation reaction on an organic monomer to generate a three-dimensional network structure, and wrapping tungsten (W) powder and copper (Cu) powder in the three-dimensional network structure to form a blank shaped by a polymer network;

step S6, after demolding, drying at room temperature for 10 hours to prevent the blank from cracking or deforming due to internal stress generated by too fast drying, and then drying in a constant-temperature drying oven at 100 ℃ for 6 hours to obtain a tungsten-copper composite blank with good surface quality and no deformation or cracking;

and (3) performance testing: measuring the bending strength of the blank by an electronic universal tester, wherein the size of a sample is 3mm multiplied by 4mm multiplied by 36mm, the span is 30mm, and the loading speed is 1 mm/min;

the test results are:

the first embodiment is as follows: the bending strength of the green body is 27.5 MPa;

example two: the bending strength of the green body is 27.8 MPa;

example two: the bending strength of the green body is 27.2 MPa;

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.