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Method for dispersing nanometer TiN powder

A nano-powder and nano-technology, which is applied in the dispersion of nano-powder and nano-TiN powder, can solve the problems of small hard agglomeration elimination effect of nano-powder and limited effect of nano-fine powder, and achieve improved matrix wettability and low oxygen content. Low, reduce the effect of impurity content

Inactive Publication Date: 2010-08-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, there are ball milling method, ultrasonic method, etc. for dispersing powder. The impact, shearing, compression, abrasion and other mechanisms of traditional ball milling method determine that this method has an obvious crushing and homogenizing effect on micron-sized and coarser powders. However, the effect on nano fine powder is limited; although the ultrasonic method can deagglomerate particle aggregates through ultrasonic "cavitation" and other effects, it also makes individual nano TiN particles approach each other through the Bernoulli force generated by nonlinear vibration to improve mutual collision, Agglomeration occurs, so that the individual powder particles that have been dispersed are recombined, and the hard agglomeration elimination effect on nano-powder is smaller than that of ball milling.

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  • Method for dispersing nanometer TiN powder
  • Method for dispersing nanometer TiN powder

Examples

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example 1

[0017] Example 1: Weigh 10g of TiN powder with a nanometer size of 50nm, 2 Deoxidation treatment is carried out in a protected continuous propulsion type moss calciner, the powder is placed in a graphite boat box, the speed of pushing the boat is 20 boats / min, the temperature of the high temperature zone is 1400 °C, H 2 Velocity is 2m 3 / h, cooling with the furnace. The deoxidized nano-TiN powder is subjected to high-energy ball milling in a planetary ball mill, the ball-milling medium is absolute ethanol, and the volume fraction of the nano-TiN powder is 6vol%; and 0.8wt% polyethylene glycol is added; the ball mill speed is 380r / min, the grinding time is 24h, the grinding ball is an ultrafine carbide ball with a diameter of Φ6mm, and the weight ratio of the ball to material is 80:1. The pH value of the slurry suspension after ball milling was adjusted to 7 by using formic acid and ammonia water, and then subjected to ultrasonic treatment for 40 minutes; then, drying treatm...

example 2

[0018] Example 2: Weigh 5g of 50nm nanometer TiN powder, 2 Deoxidation treatment is carried out in a protected continuous propulsion type moss calciner, the powder is placed in a graphite boat box, the speed of pushing the boat is 10 boats / min, the temperature of the high temperature zone is 1500 ° C, H 2 Velocity is 3m 3 / h, cooling with the furnace. The deoxidized nano-TiN powder is subjected to high-energy ball milling in a planetary ball mill, the ball-milling medium is absolute ethanol, and the volume fraction of the nano-TiN powder is 1vol%; and 0.1wt% polyethylene glycol is added; the ball mill speed is 200r / min, the grinding time is 12h, the grinding ball is an ultrafine carbide ball with a diameter of Φ6mm, and the weight ratio of the ball to material is 50:1. The pH value of the milled slurry suspension was adjusted to 6 by using formic acid and ammonia water, and then subjected to ultrasonic treatment for 25 minutes; and then dried under the conditions of a vacuu...

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Abstract

The invention discloses a method for dispersing nanometer TiN powder. The method is characterized by comprising the steps that firstly the nanometer TiN powder is subjected to deoxidation treatment under hydrogen protection, and then absolute ethyl alcohol is used as a medium and polyethylene glycol is added to be used as an activating agent to perform high-energy ball milling treatment, and finally the pH value of the slurries after ball milling is regulated and ultrasonic dispersion and vacuum drying are conducted. The nanometer TiN powder obtained by the dispersion method has low oxygen content, even dispersion, hard-agglomeration-free, and improved matrix wettability, and can be used as an addictive of Ti(C, N) base metal ceramics or directly used as a hard phase of a nanometer metal ceramic material.

Description

technical field [0001] The invention relates to a method for dispersing nanometer powder, in particular to a method for dispersing nanometer TiN powder, and belongs to the fields of powder metallurgy and metal ceramics. Background technique [0002] TiN is a member of the family of refractory transition metal nitrides. It has extremely high melting point, hardness, good corrosion resistance and thermodynamic stability, and also has good thermal conductivity and electrical conductivity similar to metals. One of the main hard phases of Ti(C,N) cermet tool materials. Ti(C,N)-based cermets have good red hardness, low corrosion, thermal conductivity and friction coefficient, and good anti-sticking ability, and can be used to make micro indexable inserts for fine boring, precision Hole processing and turning instead of grinding and other finishing fields; its function fills the traditional WC-Co series cemented carbide and Al 2 o 3 Blank between ceramic knives. Although it has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/076
Inventor 熊计郭智兴熊素建左丽莎陈建中吴悦梅范洪远
Owner SICHUAN UNIV