Fine-grained cubic boron nitride blade and preparation method thereof

A boron nitride knife and fine-grained technology, applied in the field of fine-grained cubic boron nitride blades and their preparation, can solve the problems of high price and high production cost

Inactive Publication Date: 2017-01-11
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purchase and use of foreign fine-grained cubic boron nitride cutting tools is very expensive, resulting in high production costs, while domestic cubic boron nitride cutting tools are limited by the formula and process, and research on fine-gr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] The method for preparing the above fine-grained cubic boron nitride blade includes the following steps:

[0023] (1) Purification and reduction treatment: boil the cubic boron nitride powder with mixed acid solution for 6-7h, wash with deionized water until neutral, then boil it with aqua regia for 6-7h, and wash with deionized water until neutral, then Boil for 5h~6h with alkali solution, then boil and rinse with deionized water for 9h~10h. After rinsing, the conductivity of deionized water is less than 2.8µS / cm, and finally dry for use. The drying temperature is 150℃~200℃. Drying time is 10-20h; take the nano-binding agent according to the stated ratio, put it into a hydrogen reduction furnace for reduction treatment, the treatment temperature is 650-750°C, the treatment time is 3-5h, after treatment, take it out for use; :

[0024] The mixed acid solution is prepared from sulfuric acid and nitric acid in a volume ratio of 1:1.2 to 1.5, and cubic boron nitride powder is m...

Example Embodiment

[0034] Example 1

[0035] A fine-grained cubic boron nitride blade is composed of the following raw materials in weight percentage: 60% cubic boron nitride powder with a particle size of 0.5 µm and 40% nano-binding agent. The nano-binding agent is composed of the following raw materials with a weight percentage content: 25% TiN powder, 20% NbC powder, Al 2 O 3 15% powder, 15% HfC powder, 10% Be powder, 10% WC powder and 5% Mo powder, among which TiN, NbC, Al 2 O 3 The particle size of HfC and HfC is 10, and the particle size of Be powder, WC powder and Mo powder is 20nm.

[0036] The method for preparing the fine-grained cubic boron nitride blade includes the following steps:

[0037] (1) Purification and reduction treatment: boil the cubic boron nitride powder with mixed acid solution for 6h, wash with deionized water until neutral, then boil with aqua regia for 6h, and wash with deionized water to neutral, then boil with alkali solution 5h, then boil and rinse with deionized water...

Example Embodiment

[0044] Example 2

[0045] A fine-grained cubic boron nitride blade is composed of raw materials with the following weight percentages: 80% cubic boron nitride powder with a particle size of 1 µm and 20% nano-binding agent; the nano-binding agent consists of the following weight percentages The raw material composition: TiN powder 45%, NbC powder 17%, Al 2 O 3 Powder 12%, HfC powder 12%, Be powder 6%, WC powder 6% and Mo powder 2%, of which TiN, NbC, Al 2 O 3 The particle size of HfC and HfC is 20nm, and the particle size of Be powder, WC powder and Mo powder is 30nm.

[0046] The method for preparing the above fine-grained cubic boron nitride blade includes the following steps:

[0047] (1) Purification and reduction treatment: boil the cubic boron nitride powder with mixed acid solution for 7 hours, wash with deionized water to neutral, then boil with aqua regia for 7 hours, and wash with deionized water to neutral, then use alkaline solution Boil for 6h, then boil and rinse with d...

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Abstract

The invention relates to a fine-grained cubic boron nitride blade. The blade is prepared from, by weight, 60%-80% of micro cubic boron nitride powder and 20%-40% of nano-binder, wherein the nano-binder is prepared from, by weight, 25%-45% of TiN powder, 17%-20% of NbC powder, 12%-15% of Al2O3 powder, 12%-15% of HfC powder, 6%-10% of Be powder, 6%-10% of WC powder and 2%-5% of Mo power. By adding the nano-binder, formation of a tough sintering body is promoted, the toughness of the cubic boron nitride blade is increased, and the service life is prolonged. According to the fine-grained cubic boron nitride blade prepared through the preparation method, the technical indexes can reach the conditions that the grain size is smaller than or equal to 1 micrometer, the abrasive ratio ranges from 7,000 to 7,500, the microhardness HV ranges from 6,000 to 6,500, and the bending strength ranges from 850 MPa to 900 MPa, and the requirements of precise machining can be met.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a fine-grained cubic boron nitride blade and a preparation method thereof. Background technique [0002] With the development of manufacturing technology, cutting processing is developing in the direction of high speed, high precision, and large depth of cut. As one of the most important superhard material cutting tools, cubic boron nitride cutting tools in cutting processing have high hardness, Wear resistance and chemical stability, suitable for machining requirements such as high-speed cutting, hard cutting, dry cutting, etc. Incomparable superiority. [0003] In order to improve the wear resistance, impact toughness and machinability of cubic boron nitride tools, well-known foreign companies have introduced fine-grained tool products with CBN particle sizes below 1 micron or even 0.5 microns. The CBN particle size used by Sumitomo’s BN300 in Japan is ...

Claims

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Application Information

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IPC IPC(8): C04B35/5831C04B35/626C04B35/64
CPCC04B35/5831C04B35/622C04B35/62605C04B35/6261C04B35/64C04B2235/3217C04B2235/3839C04B2235/3847C04B2235/3886C04B2235/40C04B2235/404C04B2235/5436C04B2235/5445C04B2235/656C04B2235/6581C04B2235/661C04B2235/785C04B2235/96C04B2235/963
Inventor 卢灿华张涛窦明刘俊涛
Owner ZHONGNAN DIAMOND CO LTD
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