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CN-122011789-A - Forming agent and preparation method thereof, hard alloy and preparation method thereof

CN122011789ACN 122011789 ACN122011789 ACN 122011789ACN-122011789-A

Abstract

The application relates to the technical field of powder metallurgy, and discloses a forming agent, a preparation method thereof, hard alloy and a preparation method thereof. The forming agent comprises, by mass, 45% -55% of paraffin wax, 25% -35% of polyethylene glycol, 12% -18% of stearic acid, and 5% -8% of the sum of fatty alcohol-polyoxyethylene ether and oleic acid, wherein the mass ratio of the fatty alcohol-polyoxyethylene ether to the oleic acid is (2-6): 1. The forming agent gives consideration to both improvement of the forming process and quality improvement of the prepared hard alloy.

Inventors

  • OUYANG SHUILIN
  • ZHONG ZHIQIANG
  • LAI SHENGBAO
  • LI ZHEN
  • LI XIAOLIANG
  • ZHONG LIN
  • HU WEIJUN
  • WANG CHENGYONG

Assignees

  • 赣州澳克泰工具技术有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. A molding agent, characterized by comprising, in mass percent: 45-55% of paraffin, 25-35% of polyethylene glycol, 12-18% of stearic acid, 5-8% of the sum of fatty alcohol polyoxyethylene ether and oleic acid, and the mass ratio of the fatty alcohol polyoxyethylene ether to the oleic acid is (2-6): 1.
  2. 2. The molding agent of claim 1, wherein, According to the mass percentage, the fatty alcohol polyoxyethylene ether accounts for 4-6%, and the oleic acid accounts for 1-2%.
  3. 3. The molding agent according to claim 1 or 2, characterized in that at least one of the following conditions is satisfied: the average molecular weight of the polyethylene glycol is 2000-3000; the fatty alcohol-polyoxyethylene ether comprises at least one of AEO-5, AEO-7 and AEO-3.
  4. 4. A method of preparing the molding agent of any one of claims 1 to 3, comprising: carrying out first mixing treatment on paraffin and polyethylene glycol to obtain a first matrix; performing second mixing treatment on the first matrix and stearic acid to obtain a second matrix; And (3) dropwise adding the mixture of the fatty alcohol-polyoxyethylene ether and the oleic acid into the second matrix for third mixing treatment to obtain the forming agent.
  5. 5. The method of claim 4, wherein at least one of: the stirring speed of the first mixing treatment is 90 rpm-120 rpm; The temperature of the first mixing treatment is 65-75 ℃; the stirring speed of the second mixing treatment is 60 rpm-80 rpm; the temperature of the second mixing treatment is 70-80 ℃; The stirring speed of the third mixing treatment is 40 rpm-60 rpm; The time of the third mixing treatment is 90-150 min.
  6. 6. A method of making a cemented carbide comprising: A molding agent prepared by the molding agent according to any one of claims 1 to 3 and/or the method according to any one of claims 4 to 5; And (3) mixing the hard alloy powder with the forming agent, extruding, degreasing and sintering to obtain the hard alloy.
  7. 7. The method of claim 6, wherein the step of providing the first layer comprises, The mass ratio of the forming agent in the materials obtained after the mixing treatment is 5% -8%.
  8. 8. The method according to claim 6 or 7, characterized in that at least one of the following is fulfilled: The viscosity of the material obtained after the mixing treatment is less than or equal to 800 Pa s at the temperature of 75-85 ℃; after the extrusion molding treatment, the bending strength of the obtained green body is more than or equal to 6MPa, and the surface roughness Ra is less than or equal to 1.6 mu m; in the degreasing treatment process, the temperature rising rate is controlled to be 3-5 ℃ per minute; after the sintering treatment, the density of the obtained sintered body is more than or equal to 99.5 percent.
  9. 9. A cemented carbide, characterized in that it is prepared with the forming agent according to any one of claims 1-3.
  10. 10. The cemented carbide according to claim 9, wherein the cemented carbide comprises at least one of WC-Co-based cemented carbide, WC-TiC-Co-based cemented carbide, WC-TaC-Co-based cemented carbide, WC-NbC-Co-based cemented carbide.

Description

Forming agent and preparation method thereof, hard alloy and preparation method thereof Technical Field The application relates to the technical field of powder metallurgy, in particular to a forming agent and a preparation method thereof, and a hard alloy and a preparation method thereof. Background The preparation of hard alloy by powder metallurgy is an important process for preparing products with high length-diameter ratio such as micro drills, milling cutters, bars and the like. The action of the forming agent influences a plurality of forming processes such as rheological behavior of a feed, dispersion state of powder, mechanical properties of a green body and the like in the process of preparing the hard alloy by powder metallurgy. The addition of the shaping agent as a temporary carrier in the powder metallurgy process can improve the formability and plasticity of the powder. Therefore, efficient and easily removable forming agents are important to powder metallurgy technology. It should be noted that the foregoing statements are merely to provide background information related to the present disclosure and may not necessarily constitute prior art. Disclosure of Invention In the first aspect of the application, the application provides a forming agent which comprises, by mass, 45% -55% of paraffin wax, 25% -35% of polyethylene glycol, 12% -18% of stearic acid, and 5% -8% of the sum of fatty alcohol-polyoxyethylene ether and oleic acid, wherein the mass ratio of the fatty alcohol-polyoxyethylene ether to the oleic acid is (2-6): 1. In some embodiments, the fatty alcohol-polyoxyethylene ether accounts for 4% -6% of the oleic acid and the oleic acid accounts for 1% -2% of the fatty alcohol-polyoxyethylene ether. In some embodiments, at least one of the following conditions is satisfied, wherein the average molecular weight of the polyethylene glycol is 2000-3000, and the fatty alcohol-polyoxyethylene ether comprises at least one of AEO-5, AEO-7 and AEO-3. In a second aspect of the application, the application provides a method for preparing the forming agent, which comprises the steps of carrying out first mixing treatment on paraffin and polyethylene glycol to obtain a first matrix, carrying out second mixing treatment on the first matrix and stearic acid to obtain a second matrix, and dropwise adding a mixture of fatty alcohol polyoxyethylene ether and oleic acid into the second matrix to carry out third mixing treatment to obtain the forming agent. In some embodiments, the stirring speed of the first mixing treatment is 90-120 rpm, and the temperature of the first mixing treatment is 65-75 ℃. In some embodiments, the stirring speed of the second mixing treatment is 60-80 rpm, and the temperature of the second mixing treatment is 70-80 ℃. In some embodiments, the stirring speed of the third mixing treatment is 40 rpm-60 rpm, and the time of the third mixing treatment is 90 min-150 min. In a third aspect of the application, the application provides a method for preparing hard alloy, which comprises the steps of adopting the forming agent and/or the forming agent prepared by the method, and carrying out mixing treatment, extrusion forming treatment, degreasing treatment and sintering treatment on hard alloy powder and the forming agent to obtain the hard alloy. In some embodiments, the mass ratio of the forming agent in the material obtained after the mixing treatment is 5% -8%. In some embodiments, at least one of the following conditions is satisfied, wherein the viscosity of the material obtained after the mixing treatment is less than or equal to 800 Pa s at 75-85 ℃, the bending strength of the obtained green body is more than or equal to 6 MPa after the extrusion molding treatment, the surface roughness Ra is less than or equal to 1.6 mu m, the temperature rising rate is controlled to be 3-5 ℃ per minute during the degreasing treatment, and the compactness of the sintered body is more than or equal to 99.5% after the sintering treatment. In a fourth aspect of the present application, the present application provides a cemented carbide, using the forming agent of the present application. In some embodiments, the cemented carbide comprises at least one of a WC-Co-based cemented carbide, a WC-TiC-Co-based cemented carbide, a WC-TaC-Co-based cemented carbide, a WC-NbC-Co-based cemented carbide. The technical scheme provided by the application has the beneficial effects that at least: The forming agent of the application greatly reduces the internal friction force between powder and between powder and a mold wall in the preparation process of the hard alloy by combining and compounding the synergetic electrodes, effectively prevents powder agglomeration, and improves the fluidity and uniformity of a powder-forming agent system by taking the forming agent as an organic continuous phase in powder metallurgy feeding, and influences the rheological behavior of the powder system, thereby improving the mech