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Ceramic hollow sphere multi-layer brazed diamond block and manufacturing method thereof

A technology of ceramic hollow balls and diamond segments, which is used in manufacturing tools, metal processing equipment, abrasives, etc., can solve the problems of reduced effective life, reduced segment strength, and reduced metal bond holding strength to abrasive grains, etc. The effect of increasing strength and reducing thermal damage

Inactive Publication Date: 2013-11-20
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the pore structure in the grinding wheel reduces the holding strength of the metal bond to the abrasive grains, the strength of the segment itself also decreases, causing the abrasive grains to fall off and fail during processing, and the effective life is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: A ceramic hollow sphere multilayer brazed diamond block is prepared from the following raw materials according to the mass percentage content: 18% diamond abrasive grains with a particle size of about 260-350 μm; 2.5% nickel-plated graphite particles , the particle size is 30-50μm; 10% alumina ceramic hollow balls, the diameter is 100-120μm, the surface is electroless nickel-plated, the thickness is 50μm; the balance is Ni-Cr-Cu-B-Si alloy powder, its composition The content is: 1.6%B, 3.2%Si, 16%Cr, 4%Cu, and the balance is Ni. Mix the above powder evenly, then add 5% (wt) polyvinyl alcohol to the mixed powder, fill it in a mold according to a certain mass, and cold press it into a mold. The powder forming pressure is 15-20MPa, and the pressure is kept for 3 minutes. The requirements of the grinding wheel determine the size.

[0014] Put the above knot into a vacuum of 10 -2 Heating high-temperature liquid-phase brazing in a Pa vacuum furnace, holding time...

Embodiment 2

[0015] Example 2: A ceramic hollow sphere multilayer brazed diamond block is prepared from the following raw materials according to the mass percentage content: 15% diamond abrasive grains with a particle size of about 200-360 μm, and 3% nickel-plated graphite particles , the particle size is 30-50μm, 15% alumina ceramic hollow balls, the diameter is 100-120μm, the surface is electroless nickel-plated, the thickness is 50μm; the balance is Ni-Cr-Cu-B-Si alloy, its composition The content is: 3.6%B, 4.2%Si, 16%Cr, 3%Cu, and the balance is Ni. Mix the above powder evenly, then add 3% (wt) polyvinyl alcohol to the mixed powder, fill it in a mold according to a certain mass, and cold press it into a mold. The powder forming pressure is 20-25 MPa, and the pressure is maintained for 3 minutes. The requirements of the grinding wheel determine the size.

[0016] Put the above knot into a vacuum of 10 -2 Heating high-temperature liquid-phase brazing in a vacuum furnace of Pa, holding...

Embodiment 3

[0017] Example 3: A ceramic hollow sphere multilayer brazed diamond block is prepared from the following raw materials according to the mass percentage content: 16% diamond abrasive grains, with a particle size of about 200-320 μm, and 3.5% nickel-plated graphite particles , the particle size is 30-50μm, 17% alumina ceramic hollow balls, the diameter is 100-120μm, the surface is electroless nickel-plated, the thickness is 45μm; the balance is Ni-Cr-P alloy, and the content of its components is: 15 (wt) %Cr, 10 (wt) %P, 0.01 (wt) %B, the balance being Ni. Mix the above powders evenly, then fill the mixed powders with a certain mass in a mold for cold pressing, the powder forming pressure is 25-30MPa, hold the pressure for 3 minutes, and the size of the nodes is determined according to the requirements of the grinding wheel.

[0018] Keep the above-mentioned blocks at a temperature of 980°C for 10 minutes, and in a vacuum of 10 -2 Heating high-temperature liquid-phase brazing i...

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Abstract

A ceramic hollow sphere multi-layer brazed diamond block is characterized in that the diamond block comprises, by mass, 12-20% of diamond abrasive particles, 2-4% of nickel plating graphite particles, 7-20% of ceramic hollow spheres, and the balance nickel base alloy comprising chromium, and the melting point of the nickel base alloy comprising chromium is lower than 1000 DEG C. Compared with a traditional sintered diamond tool, the ceramic hollow sphere multi-layer brazed diamond block has the advantages that due to the adoption of the brazing method with active filler metal Ni-Cr-Cu-B-Si or Ni-Cr-P used, chromium carbide is formed at the interface of diamond, and holding strength of the diamond is greatly improved; the nickel plating ceramic hollow spheres are added and the nickel plating enables chemical metallurgical bonding to be achieved between the ceramic hollow spheres and the brazing filler metal, therefore, requirements of a grinding wheel on the gas hole ratio are met, and gas holes are spherical; the adding of the ceramic hollow spheres enables the diamond block to have certain brittleness, and self-sharpening of the diamond block is facilitated; the added graphite can improve lubricity and reduce heat injury of the diamond; due to the fact that copper is added to Ni-Cr-B-Si, the heat injury of the diamond is further reduced.

Description

technical field [0001] The invention belongs to the field of superhard abrasive tool manufacturing, and relates to a manufacturing technology of ceramic hollow ball multilayer brazing diamond nodes. Background technique [0002] With the development of science and technology, there are more and more primary processing, high-efficiency and high-precision processing of hard and brittle materials such as ceramics, silicon materials, and optical glass. Diamond tools are often used for cutting and grinding of the above materials. At present, diamond tools are mainly manufactured through sintering, electroplating and other processes, but sintered and electroplated diamond tools often have the phenomenon of abrasive grain falling off due to the low holding strength of diamond abrasive grains. In recent years, Ni-Cr-B-Si, Ag-Cu-Ti solder brazing technology has been adopted at home and abroad to improve the connection strength between diamond and metal matrix through diffusion, disso...

Claims

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Application Information

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IPC IPC(8): B24D3/10B24D18/00B22F1/02B22F3/16C22C26/00C22C1/08C22C1/05
Inventor 卢金斌张旺玺赵彬刘磊穆云超
Owner ZHONGYUAN ENGINEERING COLLEGE
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