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

A technology of composite materials and silicon carbide, applied in the field of material science, can solve the problems of insignificant improvement and decline in strength and toughness

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

If the content of micro-nano TiC in the silicon nitride matrix is ​​increased, although the hardness of the composite material is improved, the strength and toughness are not significantly improved, or even decreased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (20nm) + nano-SiC (50nm) + micron TiC (0.5μm), the mass percentage of each component in the composite material is: 40% micron Si 3 N 4 , 9% nano-Si 3 N 4 , 8%SiC, 38%TiC, 2%Al 2 o3 , 3%Y 2 o 3 . Nano-Si 3 N 4 (20nm) The concentration of the aqueous suspension is 2.0vol%, and the pH value of the suspension is adjusted to 9.5. The molecular weight of the dispersant polyethylene glycol is 1540, and the addition amount is Si 3 N 4 0.35wt.% of powder mass. The concentration of nano-SiC (50nm) aqueous suspension was 2.0vol%, and the pH value of the suspension was adjusted to 10. The polyethylene glycol molecular weight of the dispersant is 6000, and the addition amount is 0.4% of the SiC powder mass. After adding a dispersant to the aqueous suspension, place it in an ultrasonic cleaning machine for ultrasonic dispersion while vigorously stirring for 30 minutes, and then mix it with micron-sized Si 3 N 4 , TiC powder and ...

Embodiment 2

[0032] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (20nm) + nano-SiC (50nm) + micron TiC (0.5μm), the mass percentage of each component in the composite material is: 36% micron Si 3 N 4 , 9% nano-Si 3 N 4 , 6%SiC, 44%TiC, 2%Al 2 o 3 , 3%Y 2 o 3 . Nano-Si 3 N 4 (20nm) The concentration of the aqueous suspension is 2.0vol%, and the pH value of the suspension is adjusted to 9.5. The molecular weight of the dispersant polyethylene glycol is 2000, and the addition amount is Si 3 N 4 0.3% of powder mass. The concentration of nano-SiC (50nm) aqueous suspension was 2.0vol%, and the pH value of the suspension was adjusted to 10. The polyethylene glycol molecular weight of the dispersant is 10000, and the addition amount is 0.35% of the SiC powder mass. After adding a dispersant to the aqueous suspension, place it in an ultrasonic cleaning machine for ultrasonic dispersion while vigorously stirring for 30 minutes, and then mix it with micron-sized Si 3 N 4 , TiC particles a...

Embodiment 3

[0035] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (20nm) + nano-SiC (50nm) + micron TiC (0.5μm), the mass percentage of each component in the composite material is: 25% micron Si 3 N 4 , 5% nano-Si 3 N 4 , 8%SiC, 57%TiC, 2%Al 2 o 3 , 3%Y 2 o 3 . Nano-Si 3 N 4 (20nm) The concentration of the aqueous suspension is 2.0vol%, and the pH value of the suspension is adjusted to 9~10. The molecular weight of the dispersant polyethylene glycol is 2000, and the addition amount is Si 3 N 4 0.35% of powder mass. The concentration of nano-SiC (50nm) aqueous suspension is 2.0vol%, and the pH value of the suspension is adjusted to 9~10. The polyethylene glycol molecular weight of the dispersant is 10000, and the addition amount is 0.35% of the SiC powder mass. After adding a dispersant to the aqueous suspension, place it in an ultrasonic cleaning machine for ultrasonic dispersion while vigorously stirring for 30 minutes, and then mix it with micron-sized Si 3 N 4 , TiC particles...

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Abstract

The invention discloses a preparation method of a silicon nitride-silicon carbide-titanium carbide micro-nano composite material, belonging to the technical field of material science. According to the invention, nano-scale Si3N4 and SiC particles are added to micro-scale Si3N4 and TiC particles, the raw materials are subjected to acid washing, nano particle dispersion and mixing, then through segmental temperature rise and segmental pressurizing vacuum hot pressed sintering process, the transgranular / grain boundary type composite material, of which the length-diameter ratio of silicon nitride grains in a matrix is in bimodal distribution, is prepared, and at the same time, the nano Si3N4 and SiC particles produce a good grain toughening effect, so that the micro-nano composite material has high strength, tenacity and hardness. The micro-nano composite material has hardness HV of up to 19.5Gpa, flexural strength of up to 970Mpa, and fracture toughness of up to 9.5Mpa.m<1 / 2>.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a method for preparing a silicon nitride-silicon carbide-titanium carbide micro-nano composite material. Background technique [0002] Hot-pressed silicon nitride ceramics are one of the hardest substances due to their low coefficient of thermal expansion, high thermal conductivity, high strength and toughness, high corrosion resistance, and high thermal shock resistance , making it one of the most important structural ceramics. Silicon nitride ceramics have the characteristics of wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, thermal shock resistance and low specific gravity that are incomparable to general metal materials, and are widely used in mechanical, chemical, metallurgy, aerospace and automotive industries. High temperature, anti-oxidation and wear-resistant occasions. However, the inherent brittleness an...

Claims

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Application Information

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IPC IPC(8): C04B35/81C04B35/56C04B35/584C04B35/645
Inventor 吕志杰
Owner SHANDONG JIANZHU UNIV
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