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Preparation method of alumina-coated hexagonal boron nitride composite powder for self-lubricating cutter material

A technology of hexagonal boron nitride and composite powder is applied in the field of powder metallurgy, which can solve the problems of reducing the mechanical strength of the tool matrix, reducing the mechanical properties of the tool, and increasing the wear of the tool.

Active Publication Date: 2015-09-09
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of self-lubricating tool is only suitable for high-speed cutting, and it is likely to reduce the mechanical strength of the tool matrix during the cutting process and increase tool wear
None of the above three methods fundamentally solve the problem of directly adding solid lubricants to the tool, which leads to the reduction of the mechanical properties of the tool.

Method used

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  • Preparation method of alumina-coated hexagonal boron nitride composite powder for self-lubricating cutter material

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, the preparation method of aluminum oxide coated hexagonal boron nitride powder, the steps are as follows:

[0034] Weigh 0.5 g of hexagonal boron nitride powder with an average particle diameter (D50) of 4 μm and dispersant polyethylene glycol 6000 accounting for 4% by mass of the hexagonal boron nitride powder, and mix them in 100 mL of distilled water to form a suspension. 10 mL of acetic acid-sodium acetate buffer solution with a pH of 4.5 was added to the suspension. The suspension was ultrasonically dispersed for 10 min, and magnetically stirred in a digital heat collector magnetic stirrer and heated to 35°C. Suspension I was obtained.

[0035] Weigh an appropriate amount of aluminum nitrate nonahydrate and configure it into Al 3+ The aluminum nitrate solution with a concentration of 0.15 mol / L is dropped into the uniformly dispersed hexagonal boron nitride suspension I, and the amount of the aluminum nitrate solution added is calculated according t...

Embodiment 2

[0039] Embodiment 2, the preparation method of aluminum oxide coated hexagonal boron nitride powder, the steps are as follows:

[0040] Weigh 0.5 g of hexagonal boron nitride powder with an average particle diameter D50 of 4 μm and dispersant polyethylene glycol 6000 accounting for 4% by mass of the hexagonal boron nitride powder, and mix them in 100 mL of distilled water to form a suspension. 10 mL of acetic acid-sodium acetate buffer solution with a pH of 4.5 was added to the suspension. The suspension was ultrasonically dispersed for 10 min, and magnetically stirred in a digital display collector type magnetic stirrer and heated to 40°C. Suspension I was obtained.

[0041] Take by weighing an appropriate amount of aluminum nitrate nonahydrate, configure the aluminum nitrate solution of 0.2mol / L concentration, drop in the uniformly dispersed hexagonal boron nitride suspension I, the addition of the aluminum nitrate solution is according to the molar ratio BN: Al= 1:1 count...

Embodiment 3

[0044] Embodiment 3: application experiment

[0045] A self-lubricating tool with aluminum oxide-coated hexagonal boron nitride composite powder is added. The volume percentage of raw materials is: micron silicon nitride 62%, nano silicon nitride 10%, micron titanium carbide 10%, alumina 3.2%, yttrium oxide 4.8%, alumina-coated hexagonal boron nitride 10% (the product prepared in Example 1).

[0046] The components were weighed respectively, and micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension were first prepared with an appropriate amount of absolute ethanol as the dispersion medium, and dispersed by ultrasonic for 15 min. Mix the obtained micron silicon nitride, micron titanium carbide suspension and nano silicon nitride suspension, then add aluminum oxide and yttrium oxide to obtain a mixed suspension, stir thoroughly and ultrasonically disperse for 15 minutes to obtain a multiphase suspension. Pour the above-mentioned multipha...

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Abstract

The invention relates to a preparation method of alumina-coated hexagonal boron nitride composite powder for a self-lubricating cutter material. The preparation method comprises preparing a hexagonal boron nitride suspension liquid, carrying out ultrasonic dispersion, adding an aluminum nitrate solution into the suspension liquid, slowly and dropwisely adding ammoniacal liquor with pH of 6.5-8.5 into the suspension liquid, carrying out a reaction process at a temperature of 30-40 DEG C until the reaction liquid pH is in a range of 7.0-7.5, stopping ammoniacal liquor dropwise addition, carrying out reaction stirring for 1.5-2.5h, carrying out standing, carrying out deposition and filtration, carrying out centrifugation and washing, carrying out drying to obtain aluminum hydroxide-coated hexagonal boron nitride composite powder, and carrying out vacuum calcination to obtain the alumina-coated hexagonal boron nitride composite powder with the average particle size of 4-12 microns. Through use of the alumina-coated hexagonal boron nitride composite powder in a ceramic matrix, ceramic cutter mechanical properties are improved and self lubricating effects are obtained.

Description

technical field [0001] The invention relates to a preparation method of aluminum oxide-coated hexagonal boron nitride composite powder, which belongs to the technical field of powder metallurgy. Background technique [0002] In the cutting process system composed of machine tools, cutting tools and workpieces, cutting tools are the most active factors. In the metal cutting process, the negative effects brought by the use of cutting fluid are becoming more and more obvious, such as polluting the environment, endangering the health of workers, and increasing the production cost of enterprises due to the treatment of cutting fluid. Therefore, in order to eliminate the negative effects of cutting fluid, the most effective way is to cancel the cutting fluid and perform dry cutting. Therefore, people put forward the concept of self-lubricating cutting tools, that is, adding solid lubricants into the cutting tools, so that the solid lubricants can be dispersed in the cutting tools...

Claims

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Application Information

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IPC IPC(8): C04B35/5833C04B35/01C04B35/628
Inventor 许崇海马骏衣明东肖光春陈照强陈辉
Owner QILU UNIV OF TECH
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