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Method of applying polyethyleneimine as titanium carbonitride based cermet mixed material dispersant

A polyethyleneimine and titanium carbonitride technology, applied in the field of polyethyleneimine as a titanium carbonitride-based cermet dispersant, can solve the problems of unsatisfactory formability and high pressing pressure, and achieve improved density distribution. Effects of uniformity, porosity reduction, dispersion improvement

Inactive Publication Date: 2010-07-14
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used dispersant for cermets is polyethylene glycol (PEG), which has the advantages of convenient use, less degreasing residue, and no impact on the vacuum system; the disadvantage is that the molding performance is not ideal, the hygroscopicity is strong, and the required pressing pressure is relatively high. Big

Method used

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  • Method of applying polyethyleneimine as titanium carbonitride based cermet mixed material dispersant
  • Method of applying polyethyleneimine as titanium carbonitride based cermet mixed material dispersant
  • Method of applying polyethyleneimine as titanium carbonitride based cermet mixed material dispersant

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: Prepare 0.5075 g of cermet mixed powder according to Table 1, add 20 mL of absolute ethanol, and add 0.0350 wt % polyethyleneimine (PEI) and polyethylene glycol (PEG) to the mixed powder respectively. The slurry configured in the beaker was vibrated in an ultrasonic biochemical analyzer for 20 minutes, and quickly poured into a 25ml measuring cylinder for sedimentation observation. The quality of the dispersibility is qualitatively evaluated by observing the sedimentation of the powder. If the sedimentation phenomenon is not obvious, the better the dispersion, the more stable the slurry is; otherwise, the slurry is unstable.

[0014] figure 1 It is a sedimentation photo of Ti(C,N)-based cermet mixed powder added with 0.0350wt% PEI, 0.0350wt% PEG and no dispersant in absolute ethanol after standing for 24h. From figure 1 It can be seen from the figure that PEI can greatly improve the dispersion of the slurry. After adding PEI, the slurry is very stable. Afte...

example 2

[0020] Example 2: Prepare 0.5075 g of cermet mixed powder according to Table 1, add 20 mL of absolute ethanol, and add 0.0350 wt % of PEI or PEG to the mixed powder respectively. Put the slurry configured in the beaker into an ultrasonic biochemical analyzer to vibrate for 20 minutes, quickly pour it into the adapter of the HB DV-II+Pro rotational viscometer to measure the viscosity of the slurry, and evaluate the dispersion by viscosity measurement. Viscosity The smaller the , the better the dispersibility, and vice versa, the worse the dispersibility.

[0021] figure 2 The rheological curve of the slurry when the mixed powder is dispersed in absolute ethanol under the addition of 0.0350wt% PEI and 0.0350wt% PEG. It can be seen from the figure that under the same amount of addition, the viscosity of the system added with PEI is significantly lower than that of the system added with PEG, and the dispersion effect of PEI is better than that of PEG.

example 3

[0022] Example 3: prepare cermet mixed powder according to the composition ratio in Table 1 and carry out ball milling, use absolute ethanol as the ball milling medium, add 1.1628wt% PEI, adjust the pH to 6.5 with formic acid, the ball-to-material ratio is 5:1, and the rotating speed is 160r / min , Milling time 48h. After the slurry is dried and ground, it is pressed into shape under a pressure of 200 MPa, and then degreased and sintered to form a final product.

[0023] Table 3 lists the green density of PEI with and without dispersant. Since PEI can act as a lubricant in the pressing process, adding PEI can effectively increase the density of the sample, and the increase is about 2.9%.

[0024] Table 3 Density of Ti(C,N)-based cermet compacts

[0025]

[0026] Table 4 lists the flexural strength of Ti(C,N)-based cermet samples prepared with and without dispersant PEI. The determination of flexural strength follows GB 3851-83. After adding PEI, the powder dispersibility...

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Abstract

The invention relates to a method of applying polyethyleneimine as a titanium carbonitride based cermet mixed material dispersant, PEI accounting for 0.035wt%-1.1628wt% of the powder is added when the titanium carbonitride based cermet mixed powder is ball milled, and the pH of the material slurry is controlled between 6 and 7 to obtain a best dispersion environment. Through settlement observation and comparison, adopting the PEI as the dispersant can significantly improve the dispersiveness of TiN-TiC-Mo-C mixed powder in an absolute ethyl alcohol medium when ultrasonic wave and ball milled powder are mixed. The viscosity of the material slurry prepared by adding PEI is lower than the viscosity of the material slurry prepared by adding PEG with the same percentage by weight. Compared with Ti (C, N) base cermet without PEI mixed material, the Ti (C, N) base cermet prepared by adding the PEI mixed material has increased compaction density, the porosity of a sintered body is reduced, the microstructure is homogeneous, and the bending strength is improved.

Description

technical field [0001] The invention belongs to the field of preparation of titanium carbonitride-based cermets, and in particular relates to a method for using polyethyleneimine as a dispersant for titanium carbonitride-based cermets. Background technique [0002] Ti(C,N)-based cermets have excellent properties, and grain refinement is currently one of the main development directions to improve their properties. In order to obtain fine-grained Ti(C,N)-based cermets, the particle size of the raw material powder used is getting smaller and smaller. Due to the reduction of powder particle size and the increase of its surface energy, agglomeration easily occurs between powder particles in the mixing medium (the common medium is absolute ethanol). Once agglomerates are formed, it will have adverse effects on the compression molding and sintering process. , resulting in a decrease in product performance. Therefore, in order to obtain high-performance Ti(C,N)-based cermets, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/04
Inventor 丰平李晓贺张晓明赵玉玲
Owner CHINA THREE GORGES UNIV
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