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Direct-writing molded SiCw/SiC composite material and preparation method thereof

A composite material, direct writing technology, applied in the direction of additive processing, etc., can solve problems such as poor strength and toughness, and achieve the effect of short molding cycle, maintaining printing stability, and strong integrity

Inactive Publication Date: 2019-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the extrusion of the slurry during the 3D direct writing molding process can promote the directional arrangement of the grains, and it is expected to obtain directional arranged silicon carbide whisker-reinforced silicon carbide composite materials, which can solve the problem of poor strength and toughness of traditional 3D printed silicon carbide composite materials The problem
[0006] However, so far, there is no research on the combination of precursor method and direct writing molding technology to obtain SiC w / Report on SiC Composite Materials

Method used

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  • Direct-writing molded SiCw/SiC composite material and preparation method thereof
  • Direct-writing molded SiCw/SiC composite material and preparation method thereof
  • Direct-writing molded SiCw/SiC composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Weigh 8g, 1.6g, 4g and 0.05g of PCS (SiC precursor), SiCw (whisker), SiC powder (inert filler) and methyl methacrylate (dispersant) respectively; put them into polytetrafluoroethylene In the ethylene ball mill tank, add 20g of n-hexane, and add 40g of zirconia grinding balls, the diameter of the ball is 8mm; then ball mill, the speed is 80r / min, the ball milling time is 24h; then the slurry is poured into the beaker, and the poly Divinylbenzene (crosslinking agent) 2.0g, magnetically stirred, and weighed the weight of the solution at this time, accompanied by the volatilization of n-hexane, stop stirring until the solid phase volume content of the slurry is 60.2vol%; The slurry is put into the syringe, and then defoamed by centrifugation. The centrifugal speed is 2000r / min and the centrifugation time is 10min. Then the syringe is taken out, and 3D direct writing equipment is installed to prepare for printing and molding; the printing needle is 160μm, printing The height ...

Embodiment 2

[0062] This example 2 is used to investigate the effect of solid content and printing height on SiC w / SiC-based composite materials, including other parts unchanged, when the printing height is 0.3mm, the solid content is 57.7vol%, 59.9vol% and 62.3vol%. The composite material is prepared when the solid content is 62.3vol% and the printing height is 0.6mm, 0.5mm, 0.4mm and 0.3mm.

[0063] Weigh 8g, 1.6g, 2g and 0.01g PCS (SiC precursor), SiC w (Whisker) and nano SiC powder, methyl methacrylate (dispersant); put it in a polytetrafluoroethylene ball mill tank, add 18g n-hexane, and add 30g zirconia grinding ball, the diameter of the ball is 8mm; Then it was ball milled at a speed of 100r / min and the ball milling time was 12h; then the slurry was poured into a beaker, 1.0g polydivinylbenzene (crosslinking agent) was added, magnetically stirred, and the weight of the solution was weighed. , Along with the volatilization of n-hexane, stop stirring until the solid phase volume content...

Embodiment 3

[0066] Weigh 8g, 1.6g and 0.01g PCS (SiC precursor), SiC w (Whisker) and glyceryl tristearate (dispersant); put it in a polytetrafluoroethylene ball mill tank, add 18g n-hexane, and add 30g zirconia grinding ball, the diameter of the ball is 8mm; then ball milling , The rotation speed is 160r / min, and the ball milling time is 20h; then the slurry is poured into a beaker, 1.0g polydivinylbenzene (crosslinking agent) is added, magnetically stirred, and the weight of the solution at this time is weighed. The n-hexane volatilizes until the solid phase volume content of the slurry is 65vol%, and the stirring is stopped; the slurry is placed in a syringe, and then centrifuged to defoam, the centrifugal speed is 2000r / min, and the centrifugal time is 8min; then the needle Take out the cylinder, install 3D direct writing molding equipment, and prepare for printing; the printing needle nozzle is 160μm, the printing height is 0.4mm, the printing speed is 8mm / s, the printing gas and air pr...

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Abstract

The invention discloses a direct-writing molded SiCw / SiC composite material and a preparation method thereof. The preparation method includes: adding PCS and SiCw into an organic solvent, adding an ester dispersant, and conducting ball milling for certain period of time to obtain a high whisker content, uniform and stable ink with certain viscoelasticity. According to a set procedure, a three-dimensional structure is printed out layer by layer on a substrate, and finally conducting curing and cracking to obtain the SiCw / SiC composite material. The method provided by the invention utilizes thevolatile organic solvent and stable cross-linking agent to realize the stable extrusion of a SiCw / PCS based organic slurry, and overcomes the disadvantages of easy nozzle blockage, poor continuity andunstable slurry in the molding process of previous direct-writing molded ceramic suspensions, especially high whisker content suspensions. The designed slurry has simple and reasonable composition, and strongly controllable rheological properties, and is convenient for large-scale industrial application. At the same time, the three-dimensional periodic structure prepared according to the invention has a wide range of scales, and the high strength and modulus of SiC whisker can be combined to prepare a 3D-SiCw / SiC based composite material with good strength and toughness.

Description

Technical field [0001] The invention belongs to the range of three-dimensional structure forming, and specifically relates to a direct writing forming SiC w / SiC composite material, especially relates to a high-content oriented silicon carbide whisker reinforced silicon carbide composite material and a preparation method thereof. Background technique [0002] The high efficiency and low consumption of supersonic weapon systems and aerospace engines place higher requirements on the high-temperature mechanical properties, ablation resistance, and lightweight of materials. Fiber reinforced SiC (SiC f / SiC) composite material has high specific strength, high melting point, and excellent ablation resistance. If used in an engine, it can increase the operating temperature by 400~500℃ and reduce the weight by more than 50%. It is the next generation spacecraft heat-bearing component ( Such as flame tube, turbine guide vane, heat shield, vector nozzle adjustment piece, etc.) ideal materi...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622C04B35/565B33Y70/00B33Y10/00
CPCB33Y10/00B33Y70/00C04B35/806C04B35/565C04B35/622C04B2235/5276C04B2235/6026
Inventor 熊慧文张斗陈何昊赵连仲周科朝
Owner CENT SOUTH UNIV
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