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Self-lubricating ceramic cutter material with h-BN@Ni core-shell structure composite powder added and preparation method of self-lubricating ceramic cutter material

A technology of composite powder and core-shell structure, which is applied in the field of ceramic tool materials, can solve the problems of small elimination effect and small promotion effect of ceramic tool material densification, so as to improve sintering density, improve mechanical properties and wear resistance Effect

Active Publication Date: 2017-06-30
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology still has deficiencies: First, alumina, silicon dioxide, and silicon carbide coated hexagonal boron nitride powder are all ceramic materials, which cannot or rarely produce a liquid phase during the sintering process. The elimination effect of the card house structure of boron nitride is very small, and thus the promotion effect on the densification of the prepared ceramic tool material is small

Method used

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  • Self-lubricating ceramic cutter material with h-BN@Ni core-shell structure composite powder added and preparation method of self-lubricating ceramic cutter material
  • Self-lubricating ceramic cutter material with h-BN@Ni core-shell structure composite powder added and preparation method of self-lubricating ceramic cutter material
  • Self-lubricating ceramic cutter material with h-BN@Ni core-shell structure composite powder added and preparation method of self-lubricating ceramic cutter material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: A self-lubricating ceramic tool material with h-BN@Ni core-shell structure composite powder added, the mass percentage of each component is: α-Al 2 o 3 32.5%, (W,Ti)C 65%, h-BN@Ni 2% based on the mass of h-BN in the composite powder, MgO 0.5%.

[0060] The preparation method is as follows:

[0061] (1) Sensitization and activation of h-BN powder

[0062] Weigh 2.5g SnCl 2 2H 2 O, add 100mL of absolute ethanol and stir to dissolve to obtain a sensitization solution; 0.05gPdCl 2 Add 1mL of concentrated hydrochloric acid, stir to dissolve, then add distilled water to 100mL to obtain an activation solution. Weigh 2g of h-BN raw material powder into the above sensitization solution, ultrasonically shake for 2min, centrifuge and wash once with absolute ethanol, and then wash once with distilled water. The sensitized h-BN powder was added into the activation solution, ultrasonically oscillated for 5 min, centrifuged and washed with absolute ethanol for 3 time...

Embodiment 2

[0080] Example 2: A self-lubricating ceramic tool material with h-BN@Ni core-shell structure composite powder added, the mass percentage of each component is: α-Al 2 o 3 37%, (W,Ti)C 58.5%, h-BN@Ni 4% based on the mass of h-BN in the composite powder, MgO 0.5%. The preparation method is as follows:

[0081] (1) Sensitization and activation of h-BN powder

[0082] Weigh 5g SnCl 2 2H 2 O, added to 200mL absolute ethanol and stirred to dissolve to obtain a sensitization solution. 0.1gPdCl 2 Add 2mL of concentrated hydrochloric acid, stir to dissolve, then add distilled water to 200mL to obtain an activation solution. Weigh 4g of h-BN raw material powder into the sensitization solution, ultrasonically shake for 3min, centrifuge and wash once with absolute ethanol, and then wash once with distilled water. The sensitized h-BN powder was added to the activation solution, ultrasonically oscillated for 7 minutes, centrifuged and washed with absolute ethanol 4 times, dried in a ...

Embodiment 3

[0099] Example 3: A self-lubricating ceramic tool material with h-BN@Ni core-shell structure composite powder added, the mass percentage of each component is: α-Al 2 o 3 40%, (W,Ti)C 53%, h-BN@Ni 6% based on the mass of h-BN in the composite powder, MgO 1%. The preparation method is as follows:

[0100] (1) Sensitization and activation of h-BN powder

[0101] Weigh 10.5g SnCl 2 2H 2 O, added to 350mL absolute ethanol and stirred to dissolve to obtain a sensitization solution. 0.3gPdCl 2 Add 4mL of concentrated hydrochloric acid, stir to dissolve, then add distilled water to 350mL to obtain an activation solution. Weigh 6g of h-BN raw material powder into the sensitization solution, ultrasonically shake for 5min, centrifuge and wash once with absolute ethanol, and then wash once with distilled water. The sensitized h-BN powder was added to the activation solution, ultrasonically oscillated for 7 minutes, centrifuged and washed with absolute ethanol 4 times, dried in a v...

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Abstract

The invention relates to a self-lubricating ceramic cutter material with h-BN@Ni core-shell structure composite powder added and a preparation method of the self-lubricating ceramic cutter material. The self-lubricating ceramic cutter material is prepared from components in percentage by mass as follows: 25%-45% of alpha-Al2O3, 50%-70% of (W,Ti)C, 2%-10% of h-BN@Ni composite powder in terms of the mass of h-BN and 0.4%-1.5% of MgO. The preparation method comprises the steps as follows: sensitizing and activating h-BN powder, preparing h-BN@Ni composite powder through chemical plating, preparing alpha-Al2O3, (W,Ti)C and h-BN@Ni suspensions respectively, performing ball milling and vacuum drying, placing obtained mixed powder into a mold, and performing cold-press forming and hot-press sintering. The breaking tenacity of the self-lubricating ceramic cutter material can be improved substantially, the sintering temperature of the ceramic cutter material can be decreased, energy is saved, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to a self-lubricating ceramic tool material with nickel-coated hexagonal boron nitride (h-BN@Ni) core-shell structure composite powder and a preparation method thereof, belonging to the technical field of ceramic tool materials. Background technique [0002] In modern machining technology, with the emergence of various difficult-to-machine materials and the improvement of efficiency, precision and environmental protection requirements, cutting tool technology has increasingly become one of the key factors affecting the development of the machinery manufacturing industry. Compared with traditional cutting tool materials such as high-speed steel and cemented carbide, ceramic cutting tool materials have the advantages of high hardness, wear resistance, high temperature resistance and good chemical stability. However, due to the inherent low toughness and low thermal shock resistance of ceramic materials, cutting fluid cannot be used ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/78C04B35/622C04B35/628C04B35/645
CPCC04B35/10C04B35/622C04B35/62842C04B35/62886C04B35/645C04B35/78C04B2235/3206C04B2235/3839C04B2235/386C04B2235/405C04B2235/96
Inventor 许崇海吴光永衣明东肖光春陈照强
Owner QILU UNIV OF TECH
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