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CN-122012973-A - High-strength hard alloy and preparation method thereof

CN122012973ACN 122012973 ACN122012973 ACN 122012973ACN-122012973-A

Abstract

The invention discloses a high-strength hard alloy and a preparation method thereof, and relates to the technical field of hard alloys. The preparation method of the high-strength hard alloy comprises the following steps of (1) adding WC coarse crystals, WC fine crystals, co powder, titanium carbide and chromium carbide into a planetary ball mill, adding a forming agent for ball milling to obtain a mixture, (2) placing the mixture into a mould for compression molding to obtain a green body, and (3) sintering the green body to obtain the high-strength hard alloy. The hard alloy prepared by the invention has excellent bending strength and corrosion resistance.

Inventors

  • YU JING
  • JING ZHENGBIAO
  • XIONG BAOYU
  • JIAN QINGPING

Assignees

  • 成都工业职业技术学院

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. The preparation method of the high-strength hard alloy is characterized by comprising the following steps of: (1) Adding WC coarse crystals, WC fine crystals, co powder, titanium carbide and chromium carbide into a planetary ball mill, and adding a forming agent for ball milling to obtain a mixture; (2) Placing the mixture into a mould, and performing compression molding to obtain a green body; (3) Sintering the green body to obtain high-strength hard alloy; The forming agent is prepared by the following method: s1, reacting 3, 5-diaminophenylboronic acid with diethyl (2-chloroethyl) phosphonate to generate an intermediate 1; S2, reacting the intermediate 1 with 1, 2-epoxy-5-hexene to generate an intermediate 2; S3, reacting the intermediate 2 with 4- (4-mercaptophenyl) -N- (3-trimethoxysilylpropyl) butyramide under the action of a photoinitiator to generate the forming agent.
  2. 2. The method for producing a high-strength cemented carbide according to claim 1, wherein in step (1), the WC coarse-grain is 40-50 parts by weight, the WC fine-grain is 30-40 parts by weight, the Co powder is 6-10 parts by weight, the titanium carbide is 0.4-0.6 parts by weight, and the chromium carbide is 0.5-0.8 parts by weight.
  3. 3. The method for preparing a high strength cemented carbide according to claim 1, wherein in step S1, the feeding molar ratio of 3, 5-diaminophenylboronic acid to diethyl (2-chloroethyl) phosphonate is 1 (2.01-2.03).
  4. 4. The method for preparing a high strength cemented carbide according to claim 1, wherein in step S2, the molar ratio of the intermediate 1 to 1, 2-epoxy-5-hexene is 1 (2.03-2.05).
  5. 5. The method for preparing a high strength cemented carbide according to claim 1, wherein in step S3, the molar ratio of the intermediate 2 to the 4- (4-mercaptophenyl) -N- (3-trimethoxysilylpropyl) butanamide is 1 (2.04-2.08).
  6. 6. The method for preparing the high-strength cemented carbide according to claim 1, wherein the reaction temperature in the step S1 is 50-60 ℃, the reaction time is 6-8h, the reaction temperature in the step S2 is 70-80 ℃ and the reaction time is 3-5h.
  7. 7. The method of claim 1, wherein in step S3, the photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone.
  8. 8. The method of producing a high strength cemented carbide according to claim 1, wherein in step (1), the amount of the forming agent is 4wt% to 6wt% of the total amount of the other raw materials except the forming agent.
  9. 9. The method for producing a high strength cemented carbide according to claim 1, wherein in step (2), the press forming is performed under a pressure of 200 to 300MPa for a press time of 20 to 30 minutes.
  10. 10. A high strength cemented carbide, characterized by being produced by the method of any one of claims 1-9.

Description

High-strength hard alloy and preparation method thereof Technical Field The invention relates to the technical field of hard alloy, in particular to a high-strength hard alloy and a preparation method thereof. Background The hard alloy has excellent properties such as high hardness, high strength, wear resistance, corrosion resistance and the like, and is widely applied to the high-end manufacturing fields such as cutting tools, mining machinery, oil gas drilling, precision dies and the like. With the continuous improvement of the requirements of the modern industry on the material performance, the traditional hard alloy is challenged in the aspects of the cooperative optimization of green strength and corrosion resistance. At present, the hard alloy is formed by adopting traditional forming agents such as paraffin, polyvinyl alcohol or polyethylene glycol, and the traditional forming agents are weak in interface combination with WC and Co powder, so that the green strength is insufficient, and the hard alloy is easy to crack in the carrying process. In addition, the forming agent is completely volatilized during the degreasing stage and cannot have a positive effect on the final properties of the alloy (such as corrosion resistance). Therefore, the development of the multifunctional forming agent capable of synchronously improving the green strength and enhancing the corrosion resistance has important significance for improving the strength and the corrosion resistance of the hard alloy. The Chinese patent publication No. CN109778046A discloses a preparation method of WC-Co hard alloy with a low-cost high-performance mixed crystal structure, which comprises the steps of preparing mixed powder from ammonium meta-tungstate, WC powder, graphite powder and cobalt powder, adding deionized water, ball-milling the mixed material, adding a forming agent, press forming, degreasing and calcining, and sintering to obtain WC-Co hard alloy with a mixed crystal structure. The WC-Co hard alloy prepared by the method has high hardness, bending strength and fracture toughness, and has good comprehensive mechanical properties, but the corrosion resistance is still insufficient. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a high-strength hard alloy and a preparation method thereof. In order to achieve the above object, the present invention is realized by the following technical scheme: the preparation method of the high-strength hard alloy comprises the following steps: (1) Adding WC coarse crystals, WC fine crystals, co powder, titanium carbide and chromium carbide into a planetary ball mill, and adding a forming agent for ball milling to obtain a mixture; (2) Placing the mixture into a mould, and performing compression molding to obtain a green body; (3) Sintering the green body to obtain high-strength hard alloy; The forming agent is prepared by the following method: S1, reacting 3, 5-diaminophenylboronic acid with diethyl (2-chloroethyl) phosphonate to generate an intermediate 1, wherein the reaction equation is shown as follows: S2, reacting the intermediate 1 with 1, 2-epoxy-5-hexene to generate an intermediate 2, wherein the reaction equation is shown as follows: s3, reacting the intermediate 2 with 4- (4-mercaptophenyl) -N- (3-trimethoxysilylpropyl) butyramide under the action of a photoinitiator to generate the forming agent. The reaction equation is shown below: In the step (1), the weight part of the WC coarse crystal is 40-50, the weight part of the WC fine crystal is 30-40, the weight part of the Co powder is 6-10, the weight part of the titanium carbide is 0.4-0.6, and the weight part of the chromium carbide is 0.5-0.8. In the step S1, the feeding mole ratio of the 3, 5-diaminophenylboronic acid to the diethyl (2-chloroethyl) phosphonate is 1 (2.01-2.03). In the step S2, the feeding mole ratio of the intermediate 1 to the 1, 2-epoxy-5-hexene is 1 (2.03-2.05). In the step S3, the feeding mole ratio of the intermediate 2 to the 4- (4-mercaptophenyl) -N- (3-trimethoxysilylpropyl) butyramide is 1 (2.04-2.08). The reaction temperature of the step S1 is 50-60 ℃, the reaction time is 6-8h, the reaction temperature of the step S2 is 70-80 ℃, and the reaction time is 3-5h. In the step S3, the photoinitiator is 2, 2-dimethoxy-2-phenylacetophenone. In the step (1), the amount of the molding agent is 4-6wt% of the total amount of other raw materials except the molding agent. In the step (2), the pressure of the compression molding is 200-300MPa, and the compression time is 20-30min. The sintering process comprises the steps of carrying out sectional heating sintering on the green blank in a sintering furnace which is vacuumized and filled with nitrogen protective atmosphere, and carrying out heat preservation treatment at 350 ℃, 1000 ℃ and 1450 ℃ in sequence to finish sintering and obtain the high-strength hard alloy. A high strength cemented carbide is prepared b