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Preparation method of high-silica compound ceramic heat insulating product

A technology of composite ceramics and high silicon oxygen, which is applied in the field of high silicon oxygen composite ceramic materials, can solve the problems of high price, high thermal conductivity, and high product cost, and achieve the effect of low cost and good heat insulation effect

Inactive Publication Date: 2013-06-26
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of missile weapon systems towards long range, high Mach, high maneuverability, and long-endurance technology, traditional resin-based insulation materials that are easy to ablate and volatilize quickly under high temperature conditions can no longer meet the long-endurance control cabin insulation. Use requirements, so high temperature resistant ceramic materials become necessary
At present, the high-temperature heat-resistant and heat-insulating silicon carbide ceramic materials used in existing engineering applications have a relatively large thermal conductivity, which is 14W / m·k from room temperature to 300°C, and the heat insulation effect is poor.
Moreover, the fiber and matrix materials for silicon carbide ceramics are extremely expensive. The market price of carbon fiber (3K) is about 4,500 yuan / kg, and the market price of polycarbosilane precursor is about 6,000 yuan / kg. The cost of products made with it is extremely high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] When making the high silica composite ceramic heat insulation frame, according to the geometric size requirements of the designed heat insulation frame, high silica fiber is woven into a profiling heat insulation frame structure, and then:

[0020] 1) Put the high-silica fiber heat insulation frame in a container to boil for 20 hours, dry for 10 hours, and then roast it with oxygen at 250°C for 1 hour in a vacuum state, and then use concentrated hydrochloric acid and concentrated nitric acid with a volume ratio of 3:1 The mixed solution is pickled, and after pickling, it is washed with water and dried.

[0021] 2) Next, place the high silica fiber heat insulation frame in a stainless steel barrel to vacuumize, and slowly pump it in with a density of 1.12g / cm 3 The silica sol submerges the high silica fiber heat insulation frame, and is immersed in the silica sol for 30 minutes.

[0022] 3) Then vibrate the stainless steel barrel to make the silica sol fluctuate violent...

Embodiment 2

[0028] When making high-silica composite ceramic heat insulation boards, weave high-silica fibers into a profiling heat insulation board structure in advance according to the geometric size requirements of the designed heat insulation boards, and then:

[0029] 1) Put the high-silica fiber heat insulation board in a container to boil for 30 hours, dry for 15 hours, and then roast for 2 hours under vacuum at 500°C, and then use concentrated hydrochloric acid and concentrated nitric acid with a volume ratio of 3:1 The mixed solution is pickled, and after pickling, it is washed with water and dried.

[0030] 2) Next, place the high-silica fiber heat insulation board in a stainless steel barrel to vacuumize, and slowly pump it in with a density of 1.16g / cm 3 Submerge the high silica fiber heat insulation board with silica sol, and immerse in the silica sol for 60 minutes;

[0031] 3) Then vibrate the stainless steel barrel to make the silica sol fluctuate violently, continue to i...

Embodiment 3

[0037] When making high-silica composite ceramic heat-insulating tiles, weave high-silica fibers into a profiling heat-insulating tile structure in advance according to the geometric size requirements of the designed heat-insulating tiles, and then:

[0038] 1) Put the high-silica fiber heat-insulating tile in a container to boil for 40 hours, dry for 12 hours, and then roast for 3 hours under vacuum at 300°C, and then use concentrated hydrochloric acid and concentrated nitric acid with a volume ratio of 3:1 The mixed solution is pickled, and after pickling, it is washed with water and dried.

[0039] 2) Next, place the high silica fiber heat insulation tile in a stainless steel bucket to vacuumize, and slowly pump it in with a density of 1.15g / cm 3 The silica sol is submerged in the high silica fiber insulation tile, and immersed in the silica sol for 30 minutes;

[0040] 3) Then vibrate the stainless steel barrel to make the silica sol fluctuate violently, continue to infil...

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Abstract

The invention discloses a preparation method of a high-silica compound ceramic heat insulating product. The method comprises the following steps of: (1) boiling high-silica fiber braided bodies with water in sequence, drying, introducing oxygen into a vacuum container for baking, washing with acid, washing with water and drying; (2) soaking the high-silica fiber braided bodies in silica sol for 30-60 minutes, and controlling the density of the silica sol at 1.12-1.16 g / cm<3>; (3) vibrating the silica sol, continually soaking the high-silica fiber braided bodies for 30-60 minutes, taking out, and drying for 20-40 hours; (4) repeatedly treating the high-silica fiber braided bodies according to the step (2) and step (3) for 2-6 times; (5) performing thermal treatment on the high-silica fiberbraided bodies at the temperature of 300-700 DEG C till the high-silica fiber braided bodies become half-ceramic rough blanks; and (6) processing the rough blanks to the needed product size to obtainthe high-silica compound ceramic heat insulating product. The preparation method has a simple process and is low in cost, and the obtained product has the characteristics of low heat conducting coefficient, good heat insulating effect, high mechanical property and superior thermal physical property.

Description

technical field [0001] The invention belongs to the technical field of high-silicon-oxygen composite ceramic materials, and in particular relates to a preparation method of a high-silicon-oxygen composite ceramic heat insulation product. technical background [0002] The high-temperature-resistant (≥1000°C) heat insulation products installed outside the missile weapon control cabin play the role of heat insulation, load bearing and anti-ablation during reentry, maneuvering, and long-endurance, and can ensure the control of the ambient temperature in the cabin Keep it within 200°C to ensure that the components in the control cabin can work normally in the harsh re-entry environment. With the development of missile weapon systems towards long range, high Mach, high maneuverability, and long-endurance technology, traditional resin-based insulation materials that are easy to ablate and volatilize quickly under high temperature conditions can no longer meet the long-endurance con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/84
Inventor 张军邓德凤王华余天雄张志斌
Owner 湖北三江航天江北机械工程有限公司