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CN-117396431-B - Composite polycrystal and tool provided with same

CN117396431BCN 117396431 BCN117396431 BCN 117396431BCN-117396431-B

Abstract

A composite polycrystalline body comprising diamond grains and non-diamond carbon, wherein the total of the content Vd of the diamond grains and the content Vg of the non-diamond carbon is greater than 99% by volume relative to the composite polycrystalline body, the median diameter d50 of the diamond grains is 10nm or more and 200nm or less, the dislocation density of the diamond grains is 1.0X10 13 m ‑2 or more and 1.0X10 16 m ‑2 or less, the content Vd of the diamond grains and the content Vg of the non-diamond carbon satisfy the relationship of the following formula 1, and 0.01< Vg/(Vd+Vg) is not more than 0.5 formula 1.

Inventors

  • SHI TIANXIONG
  • MATSUKAWA MICHIKO
  • KUKINO SATORU

Assignees

  • 住友电工硬质合金株式会社

Dates

Publication Date
20260505
Application Date
20210611

Claims (9)

  1. 1. A composite polycrystalline body comprising diamond particles and non-diamond carbon, wherein, The total of the diamond particle content Vd and the non-diamond carbon content Vg is greater than 99% by volume relative to the composite polycrystalline body, The diamond particles have a median diameter d50 of 10nm to 200nm, The dislocation density of the diamond particles is 1.0X10 13 m -2 or more and 1.0X10 16 m -2 or less, The non-diamond carbon content Vg is 5 to 50% by volume based on the composite polycrystalline body, The content Vd of the diamond particles and the content Vg of the non-diamond carbon satisfy the relationship of the following formula 1, 0.01< Vg/(Vd+Vg) is less than or equal to 0.5 formula 1.
  2. 2. The composite polycrystalline body of claim 1, wherein the diamond particles have a dislocation density of 2.0 x 10 15 m -2 or more and 1.0 x 10 16 m -2 or less.
  3. 3. The composite polycrystalline body according to claim 2, wherein the dislocation density of the diamond particles is 2.0 x 10 15 m -2 or more and 7.0 x 10 15 m -2 or less.
  4. 4.A composite polycrystalline body according to any one of claims 1 to 3, wherein the diamond particles have a median particle diameter d50 of 10nm or more and 100nm or less.
  5. 5. The composite polycrystalline body according to claim 1 to 3, wherein, The composite polycrystalline body further comprises boron, The boron content is 0.01 mass% or more and 1 mass% or less relative to the composite polycrystal.
  6. 6. The composite polycrystalline body according to claim 1 to 3, wherein, The content Vd of the diamond particles and the content Vg of the non-diamond carbon satisfy the relationship of the following formula 2, Vg/(Vd+Vg) is 0.03-0.4 and 2.
  7. 7. The composite polycrystal according to any one of claims 1 to 3, wherein a content of at least one metal element selected from the group consisting of group iv elements, group v elements, iron, aluminum, silicon, cobalt and nickel of the periodic table is less than 1% by volume.
  8. 8. The composite polycrystal according to any one of claims 1 to 3, wherein a content of at least one unavoidable impurity selected from the group consisting of hydrogen, oxygen, nitrogen, alkali metal elements and alkaline earth metal elements is less than 0.1% by volume.
  9. 9. A tool, wherein the tool is provided with the composite polycrystalline body of any one of claims 1 to 8.

Description

Composite polycrystal and tool provided with same Technical Field The present disclosure relates to composite polycrystalline bodies and tools provided with composite polycrystalline bodies. Background Diamond polycrystal has excellent hardness and does not have directionality and cleavage of hardness, and therefore is widely used for tools such as cutting tools, trimmers, and dies, and excavating bits. Conventional diamond polycrystalline bodies are obtained by sintering diamond powder as a raw material together with a sintering aid or a binder under high pressure and high temperature (generally, the pressure is about 5 to 8gpa and the temperature is about 1300 to 2200 ℃) under conditions in which diamond is thermodynamically stable. As the sintering aid, iron group metals such as Fe, co, and Ni, carbonates such as CaCO 3, and the like can be used. As the bonding material, ceramics such as SiC can be used. The diamond polycrystalline body obtained by the above method contains a sintering aid or a bonding material. The sintering aid and the binder may cause a decrease in mechanical properties such as hardness and strength of the diamond polycrystal or in heat resistance. Also known are diamond polycrystalline bodies from which a sintering aid is removed by acid treatment, and diamond polycrystalline bodies having excellent heat resistance, which use heat-resistant SiC as a binder. However, the diamond polycrystal has low hardness and strength, and is insufficient in mechanical properties as a tool material. On the other hand, non-diamond carbon materials such as graphite, glassy carbon, amorphous carbon, onion carbon, and the like can be directly converted into diamond at ultrahigh pressure and high temperature without using a sintering aid or the like. Diamond polycrystal is obtained by sintering while directly converting from non-diamond phase to diamond phase (international publication No. 2005/065809 (patent document 1), h.sumiya et al, japanese Journal of APPLIED PHYSICS 48 (2009) 120206 (non-patent document 1)). Prior art literature Patent literature Patent document 1 International publication No. 2005/065809 Patent document 2 International publication No. 2017/073293 Non-patent literature Non-patent document 1, H.Sumiya et al, japanese Journal of APPLIED PHYSICS, 48 (2009) 120206 Disclosure of Invention The composite polycrystalline body of the present disclosure is a composite polycrystalline body comprising diamond particles and non-diamond carbon, wherein, The total of the diamond particle content Vd and the non-diamond carbon content Vg is greater than 99% by volume relative to the composite polycrystalline body, The diamond particles have a median diameter d50 of 10nm to 200nm, The dislocation density of the diamond particles is 1.0X10 13m-2 or more and 1.0X10 16m-2 or less, The content Vd of the diamond particles and the content Vg of the non-diamond carbon satisfy the relationship of the following formula 1, 0.01< Vg/(Vd+Vg) is less than or equal to 0.5 formula 1. The tool of the present disclosure is provided with the above-described composite polycrystalline body. Drawings Fig. 1 is a phase equilibrium diagram of carbon. Detailed Description [ Problem to be solved by the present disclosure ] International publication No. 2017/073293 (patent document 2) discloses a composite polycrystalline body comprising polycrystalline diamond in which diamond grains are directly bonded to each other and non-diamond carbon dispersed in the polycrystalline diamond, wherein the hydrogen content is higher than 1000ppm and not more than 20000 ppm. The composite polycrystalline body of patent document 2 is excellent in wear resistance, and therefore is suitable for wear-resistant tools such as wire dies. In recent years, a more efficient wire drawing process (for example, a high wire drawing speed) has been demanded, and further improvement in the performance (for example, improvement in slidability, improvement in hardness, and the like) of a composite polycrystal including diamond particles and non-diamond carbon has been desired. The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a composite polycrystalline body having excellent hardness and excellent sliding properties, and a tool provided with the composite polycrystalline body. [ Effect of the present disclosure ] According to the present disclosure, a composite polycrystalline body having excellent hardness and excellent slidability and a tool having the composite polycrystalline body can be provided. [ Description of embodiments of the present disclosure ] First, embodiments of the present disclosure will be described. [1] One embodiment of the present disclosure relates to a composite polycrystalline body comprising diamond particles and non-diamond carbon, wherein, The total of the diamond particle content Vd and the non-diamond carbon content Vg is greater than 99% by volume relative to the co