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Cubic boron nitride fiber abrasive particles and preparation method thereof

A technology of cubic boron nitride and abrasive grains, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as failure to achieve expected results, and achieve improved grinding efficiency and quality, good wear resistance and self-sharpening , high-strength effect

Active Publication Date: 2014-05-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to realize the regular distribution of CBN abrasive grains in the abrasive layer of ceramic, resin, and metal bonded CBN grinding wheels, people have tried many methods, but none of them can achieve the expected results. The reason is the same as that of CBN abrasive grains. figure 1 The particle states shown are directly related to

Method used

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  • Cubic boron nitride fiber abrasive particles and preparation method thereof
  • Cubic boron nitride fiber abrasive particles and preparation method thereof
  • Cubic boron nitride fiber abrasive particles and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A cubic boron nitride fiber abrasive grain, comprising two parts of 30% by weight cubic boron nitride abrasive grain and 70% by weight binder, wherein the surface layer of the cubic boron nitride abrasive grain is coated with titanium, and the thickness of the coating is 8 μm; the binder The composition and weight percentage content are: Al 2 o 3 Powder 18%, B 2 o 3 Powder 30%, Na 2 O powder 7%, SiO 2 Powder 45%.

[0035]The preparation method of cubic boron nitride fiber abrasive grains: mix the titanium-coated CBN abrasive grains with the binder, add an appropriate amount of dextrin, and stir evenly; then put the mixed raw materials into and fill the stainless steel mold groove; then Put the mold and fiber abrasive grains into a heating furnace and bake at 110°C for 130 minutes, then release the mold to obtain a CBN fiber abrasive grain blank; then put the blank into a vacuum sintering furnace (vacuum degree not less than 10 -2 Pa), the temperature of the reacti...

Embodiment 2

[0036] Example 2 is different from Example 1 in that the titanium-coated CBN abrasive grains are 35% by weight, and the binder is 65% by weight. The composition and weight percentage of the binder are: Al 2 o 3 Powder 16%, B 2 o 3 Powder 32%, Na 2 O powder 10%, SiO 2 Powder 42%.

Embodiment 3

[0037] Example 3 is different from Example 1 in that the titanium-coated CBN abrasive grains are 40% by weight, and the binder is 60% by weight. The composition and weight percentage of the binder are: Al 2 o 3 Powder 20%, B 2 o 3 Powder 28%, Na 2 O powder 3%, SiO 2 Powder 49%.

[0038] The content of raw materials used in Examples 4 to 6 and the stepwise heating and cooling process are the same as those in Examples 1 to 3, but the coating metal on the surface of the CBN is chromium with a thickness of 8 μm.

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Abstract

The invention relates to cubic boron nitride (CBN) fiber abrasive particles and a preparation method thereof. The CBN fiber abrasive particles comprise CBN abrasive particles and a bonding material, wherein the CBN abrasive particle surface is provided with a titanium coating or a chromium coating, and the thickness of the coating is 5-10 mum; the bonding material comprises 16-20wt% of Al2O3 powder, 28-32 wt% of B2O3 powder, 3-10 wt% of Na2O powder, and the balance of SiO2 powder; the sintering method is characterized by heating up to achieve a highest heating temperature of 795-805 DEG C by stage heating and preserving the heat for 18-22 min. The CBN fiber abrasive particles of the invention can realize the regular arrangement of the CBN abrasive particles in resin, ceramic, metal binder grinding wheel abrasive layers, and have the characteristics of high strength, good wear resistance and good self-sharpening performance, thus the grinding efficiency and quality are raised. The application of the CBN fiber abrasive particles in preparing grinding wheels can satisfy the grinding requirements of key components in aerospace, automobile and other industries.

Description

technical field [0001] The invention relates to cubic boron nitride fiber abrasive grains used for superhard abrasive grinding wheels, and belongs to the technical field of superhard abrasive grains. Background technique [0002] In 1957, R.H.Wentorf of the Superhard Materials Research Department of General Electric Company of the United States associated graphite into diamond, and used a similar method to successfully synthesize cubic boron nitride (Cubic Boron Nitride, hereinafter referred to as CBN) micropowder particles for the first time. From the early 1960s to the early 1970s, the former Soviet Union, the United Kingdom, the former West Germany, Japan and China have successively mastered the synthesis technology of CBN. Due to the high hardness of CBN material and its thermal stability and chemical inertness superior to that of diamond, it has attracted great attention from the processing technology circle. Various superabrasive grinding wheels made of CBN particles ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/14
Inventor 丁文锋徐九华苗情杨长勇苏宏华傅玉灿
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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