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Preparation method of silicon nitride-titanium carbonitride micro-nano composite material

A technology of titanium carbonitride micro-nano and composite materials, applied in the field of material science, can solve problems such as low brittleness and hardness limitation

Inactive Publication Date: 2014-01-22
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent brittleness and low hardness of silicon nitride materials often limit their application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (20nm) + nano TiC (50nm) + micron TiCN (0.5-1μm), the mass percentage of each component in the composite material is: 73% micron Si 3 N 4 , 2% nano-Si 3 N 4 , 3% nano-TiC, 17% micron titanium carbonitride, 5% sintering aid. Nano-Si 3 N 4 The concentration of the water suspension is 2vol%, the pH value of the suspension is adjusted to about 9.5, the molecular weight of the dispersant polyethylene glycol is 1540, and the addition amount is Si 3 N 4 0.4wt% of the powder mass; the concentration of the nano-TiC aqueous suspension is 2vol%, the pH value of the suspension is adjusted to about 10, the molecular weight of the dispersant polyethylene glycol is 4000, and the addition amount is 0.35wt% of the TiC powder mass. The prepared water suspension is then mixed with micron Si3N4 and TiCN powders, and at the same time adding sintering aids MgO and Y 2 o 3 Mixed, then loaded into a barrel, mixed in a ball mill for 12 hours, dr...

example 2

[0021] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (20nm) + nano TiC (50nm) + micron TiCN (0.5-1μm), the mass percentage of each component in the composite material is: 68% micron Si 3 N 4 , 2% nano-Si 3 N 4 , 3% nano-TiC, 22% micron titanium carbonitride, 5% sintering aid. Nano-Si 3 N 4 The concentration of the water suspension is 2vol1%, the pH value of the suspension is adjusted to about 9.5, the molecular weight of the dispersant polyethylene glycol is 1540, and the addition amount is Si 3 N 4 0.5wt% of the powder mass; the concentration of the nano-TiC aqueous suspension is 2vol%, the pH value of the suspension is adjusted to about 10, the molecular weight of the dispersant polyethylene glycol is 4000, and the addition amount is 0.4wt% of the TiC powder mass. The prepared aqueous suspension was then mixed with micron Si 3 N 4 , TiCN powder mixed, while adding sintering aids MgO and Y 2 o 3 Mixed, then loaded into a barrel, mixed in a ball mill for 12 hours, dried ...

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Abstract

The invention discloses a preparation method of a silicon nitride-titanium carbonitride micro-nano composite material. The preparation method comprises steps as follows: nano silicon nitride, nano titanium carbide and submicron titanium carbonitride powder are added to a submicron-grade silicon nitride matrix, MgO and Y2O3 are added and serve as sintering aid, and the composite material with relatively high obdurability and hardness is prepared through a reasonable sintering process, wherein the length-diameter ratios of silicon nitride crystal particles are distributed in a bimodal manner, and the sizes of the crystal particles are normally distributed. The material is uniform in tissue distribution, and the bending strength, the breaking tenacity, the hardness and the thermal shock resistance are improved obviously.

Description

technical field [0001] The invention belongs to the technical field of material science, in particular to a method for preparing a silicon nitride-titanium carbonitride micro-nano composite material. Background technique [0002] Silicon nitride ceramics have become one of the most important structural ceramics due to their low thermal expansion coefficient, high thermal conductivity, high strength and toughness, and thermal shock resistance. Silicon nitride ceramics are currently widely used in chemical, metallurgical, mechanical, aerospace and automotive industries for high temperature resistance, oxidation resistance and high wear resistance, such as turbine blades, turbochargers, ceramic bearings and metal cutting tools, etc. . However, the inherent brittleness and low hardness of silicon nitride material often limit its application range. [0003] Adding second phase particles (such as TiC, TiN, TiCN) or whiskers (such as SiC whiskers) to the silicon nitride ceramic m...

Claims

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Application Information

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IPC IPC(8): C04B35/596C04B35/622
Inventor 吕志杰
Owner SHANDONG JIANZHU UNIV
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