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Quartz fiber reinforced silica ceramic composite material densification method

A technology of composite materials and quartz ceramics, which is applied in the field of inorganic materials, can solve the problems of weak interlayer bonding and high porosity, and achieve the effects of increasing density and compressive strength, facilitating implementation, and scientific and reasonable preparation methods

Active Publication Date: 2015-09-16
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with the three-dimensional braided structure, the needle-punched braid has higher porosity and weaker interlayer bonding, so there is a certain gap in strength and densification after being composited with the quartz matrix.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of impregnation solution

[0033] Weigh 384g of high hydrogen-containing silicone oil, 2.88g of TEOS, 38.4g of deionized water, 2.88g of organotin catalyst and 15.36g of quartz powder, stir in a water bath at 35°C for 6 hours, and the viscosity is 186mPa·s, ready to use.

[0034] (2) Densification treatment

[0035] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.08MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 30°C, continue to immerse for 4 hours, then raise the temperature to 160°C for gel curing, and the curing time is 10 hours. Clean the surface of the treated sample and conduct relevant performance tests.

[0036] The sample prepared by this process: the bulk density can be increased by 16.9%; the compressive str...

Embodiment 2

[0038] (1) Preparation of impregnation solution

[0039] Weigh 400g of high hydrogen-containing silicone oil, 4.8g of TEOS, 20g of deionized water, 0.08g of nickel acetate catalyst, and 10.00g of quartz powder, stir in a water bath at 40°C for 4 hours, and the viscosity is 173mPa·s, ready to use.

[0040] (2) Densification treatment

[0041] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.10MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 60°C, continue to immerse for 2 hours, then raise the temperature to 220°C for gel curing, and the curing time is 14 hours. The solidified sample was placed in a muffle furnace for heat treatment at 300°C, cooled naturally to room temperature, and then the surface of the sample was cleaned and related performa...

Embodiment 3

[0044] (1) Preparation of impregnation solution

[0045] Weigh 200g of high hydrogen-containing silicone oil, 6.0g of TEOS, 20g of deionized water, 1.20g of organotin catalyst and 8.00g of quartz powder, stir in a water bath at 40°C for 5 hours, and the viscosity is 200mPa·s, ready to use.

[0046] (2) Densification treatment

[0047] Immerse the quartz fiber (needle-punched structure) reinforced quartz ceramic composite material sample dried to constant weight in the prepared immersion solution, and vacuum treatment for 30 minutes (vacuum degree -0.08MPa). Then put the sample and impregnating solution together in a constant temperature and humidity drying box at 50°C, continue to immerse for 6 hours, then raise the temperature to 200°C for gel curing, and the curing time is 12 hours. The cured sample was placed in a muffle furnace for heat treatment at 500°C, cooled naturally to room temperature, and then the surface of the sample was cleaned and related performance tests we...

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Abstract

The present invention belongs to the technical field of inorganic materials, and particularly relates to a quartz fiber reinforced silica ceramic composite material densification method, which comprises: respectively weighing high hydrogen content silicon oil, tetraethyl orthosilicate, deionized water, a catalyst and quartz powder, and stirring in water bath to obtain an impregnating solution; and dipping a quartz fiber reinforced silica ceramic composite material dried to achieve a constant weight state into the impregnating solution, carrying out a vacuum treatment, co-placing the composite material and the impregnating solution into a constant-temperature and constant-humidity drying oven, continuously dipping, and then curing to obtain the finished product. According to the present invention, the preparation method is scientific and rational and is simple to perform, the density and the compressive strength of the material are significantly improved, the dielectric constant and the dielectric dissipation factor of the densified material are substantially unchanged, and the influence on the tensile strength and the flexural strength of the material during the low temperature treatment is little.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a densification method of a quartz fiber reinforced quartz ceramic composite material. Background technique [0002] Quartz fiber reinforced quartz ceramic matrix composite not only retains the advantages of small thermal expansion coefficient, high strength and good thermal stability of the quartz ceramic matrix, but also effectively overcomes the sensitivity of the brittle ceramic matrix to cracks and thermal shocks. Applied to various models. Quartz fiber-reinforced quartz ceramic composites with a three-dimensional braided structure are expensive to prepare and have a long production cycle. Therefore, in some fields, low-cost needle-punched quartz fiber-reinforced ceramic matrix composites can be used to replace three-dimensional braided composites. [0003] Compared with the three-dimensional braided structure, the needle-punched braid has higher por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/622
Inventor 翟萍王洪升王重海韦其红栾强程洪浩
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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