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Method for brazing CBN (Cubic Boron Nitride) abrasive particles at low temperature

A cubic boron nitride, abrasive grain technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem of high brazing temperature, reduce the performance and dimensional accuracy of base metal materials, and limit cBN abrasive tools And other issues

Active Publication Date: 2018-10-16
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive welding temperature leads to deformation of the base metal material and grain growth, which reduces the performance and dimensional accuracy of the base metal material
In addition, there is a certain difference in the thermal expansion coefficient between cBN particles and solder. If the brazing temperature is too high, a large residual stress will be generated at the bonding interface between cBN abrasive particles and solder, and the cBN abrasive particles will be broken under the action of residual stress, reducing the Bonding strength of cBN abrasive grains and solder
The existence of these problems limits the development of high-precision, high-precision and high-performance cBN abrasive tools

Method used

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  • Method for brazing CBN (Cubic Boron Nitride) abrasive particles at low temperature
  • Method for brazing CBN (Cubic Boron Nitride) abrasive particles at low temperature

Examples

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Embodiment 1

[0024] A method for low-temperature brazing cubic boron nitride abrasive grains, comprising:

[0025] Step 1, make Sn-Cu-Ti alloy powder, Sn-Cu-Ti refers to the powder that contains Sn, Cu, Ti, Sn, Cu, Ti mass ratio can be set according to configuration; In this specific embodiment: take Mix 0.6 grams of 8-12 μm titanium powder, 1.7 grams of 300-mesh Cu40Sn pre-alloyed powder and 17.7 grams of 300-mesh pure Sn powder into a ball mill; Small balls; close the lid and place it in a ball mill for ball milling for 8 hours and take it out to dry to configure the Sn-Cu-Ti alloy powder; wherein: the mass ratio of Cu and Sn in the Cu40Sn pre-alloyed powder is: 60:40; The mass ratio of Sn, Cu and Ti in Sn-Cu-Ti alloy powder is: 92:5:3, so if it can be specifically written as Sn-5Cu-3Ti;

[0026] Step 2, ultrasonic cleaning of cubic boron nitride abrasive grains with acetone and drying;

[0027] Step 3, spread Sn-Cu-Ti alloy powder and cubic boron nitride abrasive grains successively o...

Embodiment 2

[0030] A method for low-temperature brazing cubic boron nitride abrasive grains, comprising:

[0031] Step 1, making Sn-Cu-Ti alloy powder; in this specific example: get 0.3 gram of 8-12 μm titanium powder, 5 gram of 300 mesh Cu20Sn pre-alloyed powder and 14.7 gram of 300 mesh pure Sn powder and mix them into a ball mill jar ;Introduce 1.6 milliliters of acetone into the ball mill tank, put into the ceramic pellets with a total weight of 300 grams; close the lid and put it in the ball mill for 8 hours, take it out and dry it to configure Sn-21Cu-1.5Ti alloy powder;

[0032] Step 2, ultrasonic cleaning of cubic boron nitride abrasive grains with acetone and drying;

[0033] Step 3, spread Sn-Cu-Ti alloy powder and cubic boron nitride abrasive grains successively on the polished tool substrate; in this specific embodiment: spread Sn-21Cu-1.5Ti sequentially on the polished tool substrate Alloy powder and cubic boron nitride abrasive grain; the tool base adopts 45 steel base;

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Abstract

The invention discloses a method for brazing CBN (Cubic Boron Nitride) abrasive particles at a low temperature and belongs to the technical field of superhard abrasive material tool manufacture. The method comprises the following steps: adopting acetone to clean CBN abrasive particles ultrasonically and drying the CBN abrasive particles, sequentially paving and spraying Sn-Cu-Ti alloy powder and CBN abrasive particles on a polished tool substrate; placing the tool substrate in a quartz tube and vacuumizing; then, moving the tool substrate to a heating furnace and heating the tool substrate for5-60 minutes at 350-700 DEG C; and finally, cooling the tool substrate to the room temperature under the vacuumizing state. The method has the following technological advantages: on the premise thatbrazing filler metal and the CBN abrasive particles are ensured to generate chemical bonding and the abrasive particles have sufficient bonding strength, the brazing temperature is greatly reduced toreduce loss of the metal material performance, size and shape of the tool substrate and the residual thermal stress at the bonding interface of the CBN abrasive particles and brazing filler metal is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing superhard abrasive tools, in particular to a method for low-temperature brazing of cubic boron nitride abrasive grains. Background technique [0002] Cubic boron nitride (cBN) is a material second only to diamond in hardness. Cubic boron nitride and diamond are called superhard materials together. Cubic boron nitride has the advantages of high hardness, good thermal stability, high chemical inertness and good thermal conductivity. It will not be oxidized when heated to 1000°C in the atmosphere, especially avoiding the processing of black iron-based alloys by diamond superhard abrasive tools. The limitation of material reaction has been applied as a substitute material for diamond by the international materials community. cBN superabrasive tools have broad application prospects in the grinding of difficult-to-machine materials such as nickel-based superalloys and titanium alloys. Because cBN...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/008B23K1/20B23K35/14B23K35/26B23P5/00
CPCB23K1/0008B23K1/008B23K1/20B23K35/0244B23K35/262B23P5/00
Inventor 廖信江穆德魁贺琦琦刘卓黄辉徐西鹏
Owner HUAQIAO UNIVERSITY
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