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CN-117448648-B - TiC-based nonmagnetic alloy, preparation and application

CN117448648BCN 117448648 BCN117448648 BCN 117448648BCN-117448648-B

Abstract

The invention provides TiC-based nonmagnetic alloy, preparation and application. The TiC-based nonmagnetic alloy comprises, by weight, 25-40% of Ni, 5.5-8.6% of Cr, 2.5-4.0% of Mo, 0.8-1.3% of C, 46-66% of TiC and other unavoidable trace impurities. In the TiC-based nonmagnetic alloy, the components comprise TiC, ni, cr, mo and C, and the proportion of the contents of the components is proper, so that the TiC-based nonmagnetic alloy has the characteristics of low magnetism, high hardness, high wear resistance, high temperature performance, oxidation resistance and corrosion resistance. In addition, the hard phase adopts TiC with lower self-lubricating coefficient, and does not comprise WC, so that the TiC-based nonmagnetic alloy has uniform grain size distribution, good internal stress consistency, difficult cracking and deformation problems, prolonged service life and good product stability.

Inventors

  • LI QIANG
  • WU WENHUA

Assignees

  • 株洲硬质合金集团有限公司

Dates

Publication Date
20260505
Application Date
20231114

Claims (7)

  1. 1. A TiC-based nonmagnetic alloy is characterized by comprising, by weight, 33-35% of Ni, 7.0-8.0% of Cr, 3.0-4.0% of Mo, 0.8-1.3% of C, 53-55% of TiC and other unavoidable trace impurities; the metallographic structure of the TiC-based nonmagnetic alloy comprises a TiC phase and a Ni-Mo-Cr phase, wherein the TiC phase accounts for 46-66%, and the Ni-Mo-Cr phase accounts for 35-40%; the hardness of the TiC-based nonmagnetic alloy is 85-89 HRA, and the density is 5.80-6.30 g/cm 3 .
  2. 2. The preparation method of the TiC-based nonmagnetic alloy is characterized by comprising the following steps of: mixing TiC raw material, ni raw material, cr raw material and Mo raw material corresponding to the weight percentage of the TiC-based nonmagnetic alloy according to claim 1, and then wet-milling to obtain wet-milling slurry; granulating the wet grinding slurry to obtain a blank; Pressing and forming the blank to obtain a parison; and sintering the parison to obtain the TiC-based nonmagnetic alloy, wherein in the sintering process, the vacuum degree is 3 Pa-300 Pa, and the sintering temperature is 1350 ℃ to 1450 ℃.
  3. 3. The preparation method of the polyethylene glycol powder according to claim 2, wherein in the wet milling step, the wet milling medium is absolute alcohol, the forming agent is PEG, the absolute alcohol is added in a ratio of 0.4-0.5L/kg, and the wet milling time is 30-45 hours.
  4. 4. The preparation method of the polyethylene glycol terephthalate is characterized in that the addition ratio of the forming agent is 2.5-3.0%, the PEG comprises PEG4000 and PEG1500, and the mass ratio of the PEG4000 to the PEG1500 is 2:1-3:1.
  5. 5. The method of preparing according to claim 2, further comprising, between the wet milling step and the granulating step: the wet ground slurry was filtered through 235 mesh.
  6. 6. The method according to any one of claims 2 to 5, wherein the granulating mode of the granulating step is spray drying, wherein the drying outlet temperature is 90 to 95 ℃, and the particle size of the blank is 0.40 to 0.43mm.
  7. 7. Use of a TiC-based nonmagnetic alloy according to claim 1 or prepared according to any one of claims 2 to 5 in a forming die and a hot-press welding head.

Description

TiC-based nonmagnetic alloy, preparation and application Technical Field The invention relates to the field of powder metallurgy, in particular to TiC-based nonmagnetic alloy, preparation and application. Background Since the molding die for producing the magnetic material is required to use a nonmagnetic material, nonmagnetic steel such as 1Cr18Ni9Ti, 70Mn, 9Mn9, etc. has been used as the nonmagnetic die material. However, the non-magnetic steel has poor wear resistance, low hardness and short service life, and the inner wall of the die is seriously roughened, deformed and the like after being used for a period of time, so that the dimensional accuracy and the surface quality of the magnetic material are affected. The nonmagnetic hard alloy has obvious advantages in the aspects of a die for molding the ferromagnetic powder, a sealing ring and the like in the powder metallurgy industry, has high hardness and wear resistance, can avoid die sticking during molding the ferromagnetic powder, and improves the corrosion resistance of the sealing ring. The general nonmagnetic hard alloy is WC-Ni nonmagnetic hard alloy, and for example YN14 is special nonmagnetic hard alloy. However, WC-Ni non-magnetic hard alloy is easy to crack and deform in the use process. Disclosure of Invention The invention mainly aims to provide TiC-based nonmagnetic alloy, preparation and application, so as to solve the technical problem that conventional nonmagnetic hard alloy is easy to crack and deform. The invention provides a TiC-based nonmagnetic alloy, which comprises, by weight, 25-40% of Ni, 5.5-8.6% of Cr, 2.5-4.0% of Mo, 0.8-1.3% of C, 46-66% of TiC and other unavoidable trace impurities. According to the embodiment of the application, the alloy comprises, by weight, 25-40% of Ni, 5.5-8.6% of Cr, 2.5-4.0% of Mo, 0.8-1.3% of C, other unavoidable trace impurities and the balance of TiC. According to the embodiment of the application, the metallographic structure of the TiC-based nonmagnetic alloy comprises a TiC phase and a Ni-Mo-Cr phase, wherein the TiC phase accounts for 46-66%, and the Ni-Mo-Cr phase accounts for 35-40%. According to the embodiment of the application, the TiC-based nonmagnetic alloy has the hardness of 85-89 HRA and the density of 5.80-6.30 g/cm 3. The invention also provides a preparation method of the TiC-based nonmagnetic alloy, which comprises the following steps: Mixing TiC raw material, ni raw material, cr raw material and Mo raw material which correspond to the weight percentage of the TiC-based nonmagnetic alloy, and then wet-milling to obtain wet-milling slurry. Granulating the wet ground pulp to obtain a blank. And pressing and forming the blank to obtain the parison. And sintering the parison to obtain the TiC-based nonmagnetic alloy, wherein in the sintering process, the vacuum degree is 3 Pa-300 Pa, and the sintering temperature is 1350 ℃ to 1450 ℃. According to an embodiment of the present application, in the wet milling step, the wet milling medium is absolute alcohol and the forming agent is PEG. Wherein the adding proportion of the absolute alcohol is 0.4-0.5L/kg. The wet milling time is 30-45 hours. According to the embodiment of the application, the addition ratio of the forming agent is 2.5-3.0%. The PEG includes PEG4000 and PEG1500. The mass ratio of the PEG4000 to the PEG1500 is 2:1-3:1. According to an embodiment of the present application, between the wet milling step and the granulating step, further comprising: the wet ground slurry was filtered through 235 mesh. According to the embodiment of the application, the granulating mode of the granulating step is spray drying, wherein the temperature of a drying outlet is 90-95 ℃, and the particle size of the blank is 0.40-0.43 mm. The invention also provides application of the TiC-based nonmagnetic alloy or the prepared TiC-based nonmagnetic alloy in a forming die and a hot-pressing welding head. In the TiC-based nonmagnetic alloy, the components comprise TiC, ni, cr, mo and C, and the proportion of the contents of the components is proper, so that the TiC-based nonmagnetic alloy has the characteristics of low magnetism, high hardness, high wear resistance, high temperature performance, oxidation resistance and corrosion resistance. In addition, the hard phase adopts TiC with lower self-lubricating coefficient, and does not comprise WC, so that the TiC-based nonmagnetic alloy has uniform grain size distribution, good internal stress consistency, difficult cracking and deformation problems, prolonged service life and good product stability. Drawings In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according t