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A kind of binding agent, polycrystalline cubic boron nitride cutting tool and preparation method thereof

A technology of cubic boron nitride and polycrystalline cubic, which is applied in the direction of lathe cutting tools, turning equipment, manufacturing tools, etc., can solve the problems of poor toughness, decreased wear resistance of polycrystalline cubic boron nitride, etc., and achieve toughness Poor, promote sintering, good toughening effect

Active Publication Date: 2017-04-19
郑州万创智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polycrystalline cubic boron nitride using metal as a binder usually has high cubic boron nitride content, good toughness, and better thermal conductivity than polycrystalline cubic boron nitride using ceramics as a binder, but metals are usually at a temperature of seven to eight hundred degrees. It will soften, and the softening effect of metal at high temperature will lead to a decrease in the wear resistance of polycrystalline cubic boron nitride
The melting point of ceramics is relatively high, and there will be no softening effect at high temperatures, but due to the brittleness of ceramics, the toughness of pure ceramic binder polycrystalline cubic boron nitride is slightly poor

Method used

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  • A kind of binding agent, polycrystalline cubic boron nitride cutting tool and preparation method thereof

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Embodiment 1

[0014] A kind of binding agent, described binding agent is made up of the raw material of following percentage by weight: B 4 C powder 4%, activated carbon powder 12%, silicon carbide whiskers 60%, and the balance is Al powder. The polycrystalline cubic boron nitride tool prepared by using the binder is composed of the following raw materials in weight percentage: 65% of cubic boron nitride powder and 35% of binder.

[0015] The preparation method of the polycrystalline cubic boron nitride cutting tool includes the following steps: ① Cubic boron nitride powder treatment: pickling cubic boron nitride powder (with a particle size of 1-10 µm) with 15mol / L hydrofluoric acid for 3 hours , centrifuge the acid-washed cubic boron nitride powder, wash it with distilled water for 3 times, wash it with absolute ethanol for 3 times, and then put it in a vacuum drying oven to dry at 60°C for 10 hours; ②After treating the binder with step ① Add the cubic boron nitride powder into the three...

Embodiment 2

[0018] A kind of binding agent, described binding agent is made up of the raw material of following percentage by weight: B 4 C powder 2%, activated carbon powder 20%, silicon carbide whiskers 40%, and the balance is Al powder. The polycrystalline cubic boron nitride tool prepared by using the binder is composed of the following raw materials in weight percentage: 85% of cubic boron nitride powder and 15% of binder.

[0019] The preparation method of the polycrystalline cubic boron nitride cutting tool comprises the following steps: ① Cubic boron nitride powder treatment: the cubic boron nitride powder is pickled with 10mol / L hydrofluoric acid for 4 hours, and the pickled cubic boron nitride is The boron powder was separated by centrifugation, washed twice with distilled water and four times with absolute ethanol, and then dried in a vacuum oven at 40°C for 12 hours; The mixing machine is used for mixing, the total weight of the binder and cubic boron nitride powder and the w...

Embodiment 3

[0022] A kind of binding agent, described binding agent is made up of the raw material of following percentage by weight: B 4 C powder 10%, activated carbon powder 5%, silicon carbide whiskers 50%, and the balance is Al powder. The polycrystalline cubic boron nitride cutting tool prepared by using the bonding agent is composed of the following raw materials in weight percentage: 40% of cubic boron nitride powder and 60% of bonding agent.

[0023] The preparation method of the polycrystalline cubic boron nitride cutting tool comprises the following steps: ① Cubic boron nitride powder treatment: the cubic boron nitride powder is pickled with 20mol / L hydrofluoric acid for 2 hours, and the pickled cubic boron nitride is The boron powder was separated by centrifugation, washed 4 times with distilled water and 2 times with absolute ethanol, and then dried in a vacuum oven at 80°C for 8 hours; Mixing by a mixer, the weight ratio of the total weight of the binder and cubic boron nitr...

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Abstract

The present invention relates to a binding agent, a polycrystalline cubic boron nitride cutting tool and a preparation method thereof, the binding agent is a metal - ceramic binder, combines the advantages of a metal binder and a ceramic binder, when the binding agent is used in the polycrystalline Cubic boron nitride cutting tool, in the sintering process, aluminum powder acts as the metal binder, when high temperature phase is reached, a Al3BC3 ceramic phase is formed by reaction among Al-B4C-C, the shortcomings of the metal binder are overcome; at the same time, the generated Al3BC3 ceramic phase is lath-shaped or columnar, combination of addition of SiC whiskers, a good toughening effect is achieved, poor ceramic binder toughness problem is solved, and heat generated by the reaction among Al-B4C-C can promote sintering. The bending strength of the polycrystalline cubic boron nitride cutting tool can reach 350-450MPa, and the hardness can reach 45-55GPa.

Description

technical field [0001] The invention belongs to the field of cubic boron nitride and cemented carbide composite tool materials, and in particular relates to a binder, a polycrystalline cubic boron nitride tool and a preparation method thereof. Background technique [0002] Titanium alloys and high-temperature alloys are stronger and denser than other metal structural materials, and have high thermal strength. They are the alloys with the highest strength not only at room temperature but also at high temperatures (300-400°C), plus their high corrosion resistance. , is a very important engineering material in aerospace, offshore oil, automobile shipbuilding, chemical industry, military industry and other industrial fields. Polycrystalline cubic boron nitride (PCBN) material has high hardness and wear resistance, high thermal stability and high temperature hardness, and excellent chemical properties. Due to its good stability, thermal conductivity and low coefficient of fricti...

Claims

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Application Information

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IPC IPC(8): B23B27/00C04B35/5831C04B35/81C04B35/622
Inventor 王海龙李剑马尧张锐赵笑统邵刚陈德良许红亮卢红霞范冰冰
Owner 郑州万创智造科技有限公司
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