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Method for preparing composite material of silicon nitride-titanium carbide

A technology of composite materials, silicon carbide and titanium carbide, which is applied in the field of material science and can solve problems such as strength reduction

Inactive Publication Date: 2007-06-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two toughening methods will lead to a decrease in strength while improving the fracture toughness of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (130nm) + nano TiC (50nm), the mass percentage of each component in the composite material is: 46% micron Si 3 N 4 , 20% nano-Si 3 N 4 , 25% Nano TiC, 3% Al 2 o 3 , 6%Y 2 o 3 . Nano-Si 3 N 4 (130nm) The concentration of the aqueous suspension is 2.0vol%, the pH value of the suspension is 9 to 9.5, polyethylene glycol is used as the dispersant, the molecular weight is 1540, and the addition amount is Si 3 N 4 0.4wt% of the powder mass; the concentration of nano-TiC (50nm) aqueous suspension is 2.0vol%, the pH value of the suspension is 9.5 to 10, polyethylene glycol is used as the dispersant, the molecular weight is 4000, and the addition amount is 1% of the TiC powder mass 0.5 wt%. Prepared Si 3 N 4 and TiC nanopowder suspension for 8 hours, and then with micron Si 3 N 4 Particles and sintering aid Al 2 o 3 and Y 2 o 3 Mix, dry and sieve to obtain a well-dispersed composite powder. The materials were mixed wi...

Embodiment 2

[0019] Micron Si 3 N 4 (0.5μm)+nano-Si 3 N 4 (130nm) + nano TiC (130nm), the mass percentage of each component in the composite material is: 45% micron Si 3 N 4 , 18% nano-Si 3 N 4 , 28% Nano TiC, 3% Al 2 o 3 , 6%Y 2 o 3 . Nano-Si 3 N 4 (130nm) dispersion process and parameters are the same as in Example 1; the nano-TiC (130nm) aqueous suspension concentration is 2.0vol%, the suspension pH is 9 to 9.5, polyethylene glycol is used as a dispersant, and the molecular weight is 1540, adding The amount is 0.35wt% of the mass of TiC powder. Nano-Si 3N 4 (130nm) and nano-TiC (130nm) particle suspensions with micron-sized Si 3 N 4 Particles and sintering aid Al 2 o 3 and Y 2 o 3 Mixing, drying and sieving to obtain a well-dispersed composite powder. It adopts staged heating, staged pressurization and hot pressing sintering process, and high-purity nitrogen protection. At 1200°C-1250°C, the heating rate is 80-100°C / min, and the pressure is 15MPa; at 1250-1750°C, ...

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Abstract

A process for preparing the nano-class composite silicon nitride-titanium carbide ceramic in which the granularities of silicon nitride are distributed by dual peaks includes such steps as mixing Si3N4 nanoparticles and TiC nanoparticles with Si3N4 micron-particles, and sintering by segmentally raising temp and pressurizing. Its advantages are high strength, toughness, heat shock resistance and antioxidizing performance.

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-titanium carbide composite material with a bimodal distribution of silicon nitride particle size. Background technique [0002] Silicon nitride ceramics are one of the most important structural ceramics due to their low coefficient of thermal expansion, high thermal conductivity, high strength and fracture toughness, and high thermal shock resistance. Silicon nitride ceramics are widely used in chemical, metallurgy, machinery, aerospace and automotive industries for high temperature resistance, oxidation resistance and wear resistance, such as turbine blades, turbochargers, ceramic bearings and metal cutting tools. However, the inherent brittleness and low chemical stability of silicon nitride ceramics limit its application range. [0003] By adding second phase particles (such as SiC, Al 2 o 3 , TiN), or whiskers (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/596C04B35/622
Inventor 赵军艾兴吕志杰
Owner SHANDONG UNIV
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