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A method for improving the shear performance of carbon/carbon-lithium aluminum silicon joints

A lithium-aluminum-silicon and performance technology, which is applied in the field of preparation of carbon/carbon-lithium-aluminum-silicon joints, can solve problems such as weak interface between the modified layer and the intermediate layer, so as to solve the weak interface, increase the effective connection area, and improve the Effective connection area effect

Active Publication Date: 2019-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a method for improving the shear performance of the carbon / carbon-lithium aluminum silicon joint, which improves the shear strength of the joint by solving the problem of weak bonding between the modified layer and the intermediate layer interface , the key lies in the design and realization of the mosaic interface structure

Method used

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  • A method for improving the shear performance of carbon/carbon-lithium aluminum silicon joints
  • A method for improving the shear performance of carbon/carbon-lithium aluminum silicon joints
  • A method for improving the shear performance of carbon/carbon-lithium aluminum silicon joints

Examples

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Effect test

Embodiment example 1

[0030] Cut the 2D C / C composite material into a flat plate of 30mm×30mm×4mm, polish it with 100# silicon carbide water sandpaper, clean it ultrasonically with absolute ethanol and deionized water for 30 minutes, and then place it in a blast drying oven at 100°C Dry in medium for more than 4 hours for later use.

[0031] Weigh 100g of silicon powder, 10g of carbon powder, and 5g of alumina powder, and use a roller ball mill to mix them evenly; then embed the C / C composite material in a graphite crucible with mixed powder, and seal it with graphite paper; The crucible was placed in a high-temperature reaction graphitization furnace, and under the protection of argon, the furnace temperature was raised to 1700°C at a rate of 20°C / min, and then to 2300°C at a rate of 5°C / min, and kept for 1 hour. , and then turn off the power and cool down to room temperature naturally to obtain a C / C composite material modified by silicon-based ceramic coating, the surface morphology of which is ...

Embodiment example 2

[0035] Cut the 2D C / C composite material into a flat plate of 30mm×30mm×4mm, polish it with 100# silicon carbide water sandpaper, clean it ultrasonically with absolute ethanol and deionized water for 30 minutes, and then place it in a blast drying oven at 100°C Dry in medium for more than 4 hours for later use.

[0036] Weigh 100g of silicon powder, 10g of carbon powder, and 5g of alumina powder, and use a roller ball mill to mix them evenly; then embed the C / C composite material in a graphite crucible with mixed powder, and seal it with graphite paper; The crucible was placed in a high-temperature reaction graphitization furnace, and under the protection of argon, the furnace temperature was raised to 1700°C at a rate of 20°C / min, and then to 2300°C at a rate of 5°C / min, and kept for 1 hour. , and then turn off the power and naturally cool to room temperature to obtain a silicon-based ceramic modified C / C composite material.

[0037] The above coating sample was placed in a ...

Embodiment example 3

[0041] Cut the 2D C / C composite material into a flat plate of 30mm×30mm×4mm, polish it with 100# silicon carbide water sandpaper, clean it ultrasonically with absolute ethanol and deionized water for 30 minutes, and then place it in a blast drying oven at 100°C Dry in medium for more than 4 hours for later use.

[0042] Weigh 100g of silicon powder, 10g of carbon powder, and 5g of alumina powder, and use a roller ball mill to mix them evenly; then embed the C / C composite material in a graphite crucible with mixed powder, and seal it with graphite paper; The crucible was placed in a high-temperature reaction graphitization furnace, and under the protection of argon, the furnace temperature was raised to 1700°C at a rate of 20°C / min, and then to 2300°C at a rate of 5°C / min, and kept for 1 hour. , and then turn off the power and naturally cool to room temperature to obtain a silicon-based ceramic modified C / C composite material.

[0043] The above coating sample was placed in a ...

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Abstract

The invention relates to a method for promoting the shearing performance of a carbon / carbon-lithium aluminum silicon joint. The method comprises the following steps: firstly, constructing a honeycomb porous structure on a surface of a modified layer of a silicon base ceramic by utilizing a controllable oxidizing method, and then forming an interlocked embedded interface structure by a glass interlayer and the modified layer in a hot-pressing process. According to the invention, through the design of the embedded interface structure, the effective connecting area of the modified layer and the glass interlayer is obviously increased, and the problem of weak binding of the interface is solved to a certain extent. The average shearing strength of a C / C-LAS joint prepared according to the method can reach up to 32.46+ / -1.35MPa and is 35% higher than that of a gradient joint of the patent 1. Through the construction of the embedded interface structure, the effective connecting area of the modified layer and the interlayer is increased, the problem of weak binding of the interface is solved to a certain extent, and the shearing strength of the C / C-LAS joint is obviously increased.

Description

technical field [0001] The invention belongs to a method for preparing a carbon / carbon-lithium aluminum-silicon joint, and relates to a method for improving the shear performance of a carbon / carbon-lithium aluminum-silicon joint. structure to improve joint shear performance. Background technique [0002] Carbon / carbon (C / C) composites are high-temperature thermal structural materials with excellent performance, and have great application potential in aerospace and energy fields. Lithium-aluminum-silicon (LAS) glass-ceramics has unique microwave-absorbing properties under high-temperature conditions, and has good application prospects in the field of aerospace thermal structures, but its own brittleness greatly limits its practical application. If a stable connection technology is used to reliably connect the C / C composite material with the LAS glass ceramic, the composite component can show a unique high-temperature stealth performance on the basis of giving full play to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/04
CPCC04B37/045C04B2237/083C04B2237/10C04B2237/54
Inventor 付前刚赵凤玲王璐
Owner NORTHWESTERN POLYTECHNICAL UNIV
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