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A kind of preparation method of nano-ceramic bond superhard material grinding wheel

A ceramic bond, superhard material technology, used in manufacturing tools, metal processing equipment, grinding/polishing equipment, etc., can solve the problems of difficult densification, difficulty, abnormal grain growth, etc., to reduce shrinkage , low cost, simple process effect

Inactive Publication Date: 2019-01-08
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Due to the high activity of nanoparticles, the abnormal growth of grains and the difficulty of densification are prone to disadvantages during the sintering process. Therefore, it is not easy to obtain nano-ceramic structural materials in the true sense.
(4) Compared with the traditional ceramic bond, there is a lack of systematic and in-depth research on the relationship between the structure (such as shape, content and size) of the pores in the nano-ceramic bond and its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: At room temperature, acrylamide monomer, N,N'-methylenebisacrylamide and deionized water were prepared in a mass ratio of 30:10:60 to prepare a 200ml clear solution, and the mass of the premixed liquid 0.5% of the mixture was added with 1 g of sucrose, and stirred for 1 h to obtain a premix. Add 3g of zirconium oxychloride, 0.72g of aluminum nitrate, 4.4g of sodium chloride, 24g of cubic boron nitride, and 8g of PMMA microspheres to the above premixed solution, and stir for 4 hours to obtain a uniformly dispersed solution. Add 0.05ml of 20wt% tetramethylethylenediamine solution and 0.4ml of 40wt% ammonium persulfate aqueous solution to the solution successively, stir evenly, pour into the mold, and form a gel at a constant temperature of 40°C. Then the wet gel was dried for 3 days under the condition of 40° C. and humidity of 60% rh to obtain a dry gel. The obtained xerogel was heated in a muffle furnace at a rate of 0.3 °C / min to 600 °C for 4 hours, and the...

Embodiment 2

[0023] Example 2: At room temperature, acrylamide monomer, N,N'-methylenebisacrylamide and deionized water were prepared in a mass ratio of 9.5:0.5:90 to prepare 200ml of a clear solution. Add 40g of fructose to 20% of the mixture, and stir for 2 hours to obtain a premix. Add 4g of sodium chloride, 10g of aluminum nitrate, 3g of zirconium oxychloride, 18g of diamond, and 2g of carbon spheres to the above premixed solution, and stir for 3 hours to obtain a uniformly dispersed solution. Add 0.04ml of 20wt% tetramethylethylenediamine solution and 0.6ml of 40wt% ammonium persulfate aqueous solution to the solution in turn, stir evenly, pour into the mold, and form a gel at a constant temperature of 60°C. Then the wet gel was dried for 5 days under the conditions of 80° C. and humidity of 90% rh to obtain a dry gel. The obtained xerogel was heated in a muffle furnace at a rate of 2 °C / min to 300 °C for 0.5 h, continued to rise to 550 °C for 4 h, and then at a rate of 2 °C / min to 8...

Embodiment 3

[0024] Example 3: At room temperature, acrylamide monomer, N,N'-methylenebisacrylamide and deionized water were prepared in a mass ratio of 15:0.6:84.4 to prepare a 200ml clear solution, according to the mass of the premix Add 20 g of glucose to 10% of the solution, stir for 1 h to obtain a premix. Add 3g of zirconium oxychloride, 0.72g of aluminum nitrate, 4.4g of potassium chloride, 10g of cubic boron nitride, 14g of diamond, and 8g of PS microspheres into the above premixed solution, and stir for 4 hours to obtain a uniformly dispersed solution. Add 0.1ml of 20wt% tetramethylethylenediamine aqueous solution and 0.2ml of 40wt% ammonium persulfate aqueous solution successively in the solution, pour it into the mold after stirring evenly, form a gel at a constant temperature of 40°C, and then put the wet gel at 50 ℃, humidity greater than 60% rh for 5 days, the obtained xerogel was raised to 200 ℃ for 3 hours at a heating rate of 0.5 ℃ / min in a muffle furnace, and then raised ...

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Abstract

The invention relates to a one-step preparation method of a nanometer ceramic bond type superhard material grinding wheel. The preparation method comprises the following steps of using water-soluble nitrate or chlorate, a superhard material abrasive and a perforating agent corresponding to a to-be-prepared ceramic powder as raw materials; dissolving the raw materials, monomers or a crosslinking agent into water, and adding an initiating agent and a catalyst so as to polymerize a nanometer three-dimensional space network and form a gel under the condition of constant temperature of 20 to 80 DEG C; in the gel drying process, precipitating the water-soluble nitrate or chlorate, and forming nanometer grains by the limiting of the three-dimensional space network; uniformly distributing the superhard material abrasive into a base body of the ceramic bond, and adding one or multiple organic matters with better water solubility and lower melting point, so as to obviously reduce the shrinkage of the gel in the low-temperature drying process, early melt or decompose in the dry gel sintering process, and gradually release the stress concentration. By adopting the quick sintering technique, the preparation method has the advantages that the problem of abnormal growth of the nanometer ceramic bond in the subsequent sintering process is solved, and the nanometer ceramic bond type superhard material grinding wheel with good property can be prepared.

Description

technical field [0001] The invention relates to the field of superhard material and abrasive grinding, and provides a new method for preparing a nano vitrified bond superhard material grinding wheel. Background technique [0002] Since superhard materials (such as diamond, cubic boron nitride, etc.) have the advantages of high hardness, good wear resistance, and good thermal stability, they have been widely used in various grinding tools. Among all kinds of grinding wheel bonds for superhard materials, metal bonds have poor self-sharpening and are prone to adhesion when processing metal materials, resin bonds have poor thermal stability, and vitrified bonds are between metal bonds and resin bonds. It has high heat resistance temperature, good self-sharpening, high strength and good wear resistance. Vitrified bond superhard material grinding wheel not only has the advantages of sharp cutting, small grinding force, high production efficiency, long service life, easy shaping a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24D18/00
CPCB24D18/0009
Inventor 刘瑞平贺鹏苏伟明邓福铭
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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