C/C-ZrC-SiC surface-layer iron-based alloy modified composite material and preparation method thereof

A technology of composite materials and iron-based alloys, applied in the direction of metal material coating process, coating, hot-dip plating process, etc., can solve the problems of affecting mechanical properties, reducing mechanical properties, reducing interlayer strength, etc., and achieve high temperature creep resistance Excellent denaturation properties, reducing stress concentration sources, and enhancing the surface density of the substrate

Active Publication Date: 2018-07-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in the process of preparing C / C-ZrC-SiC composite materials, since the Si-Zr alloy needs to be infiltrated into the carbon fiber blank at an ultra-high temperature, it is easy to cause damage to the carbon fiber and affect its mechanical properties; at the same time , the intense reaction between Zr element and C element (compared to Si and C) is easy to make the ceramic phase interface, ceramic phase and carbon phase interface to form micropores, which can form a stress concentration source when the material bears a load and reduce its mechanical properties; in addition , the uneven distribution of SiC-ZrC ceramic phase in the mesh tire layer and the non-weft cloth layer is easy to form interlayer surface defects and reduce its interlayer strength

Method used

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  • C/C-ZrC-SiC surface-layer iron-based alloy modified composite material and preparation method thereof
  • C/C-ZrC-SiC surface-layer iron-based alloy modified composite material and preparation method thereof
  • C/C-ZrC-SiC surface-layer iron-based alloy modified composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Set the density to 2.6g / cm 3 The surface of the C / C-ZrC-SiC composite material is polished, ultrasonically cleaned, and dried in a low-temperature vacuum for use; meanwhile, the Fe-15Cr-25Ni series iron-based superalloy powder is dried in a low-temperature vacuum for use.

[0057] Check the quality of the smelting furnace, bake the furnace at 500°C for 1 hour and use it for later use; meanwhile, clean the crucible tongs and dry them for later use.

[0058] Heat the iron-based superalloy powder in the smelting furnace to 10°C-100°C above the melting point (after about 1650°C), then add a deoxidizer accounting for 0.05% to 0.075% of the alloy melt mass, press it to the bottom with a tool and move slowly until until no bubbling; then add slag breaking agent, fully stir with tools, remove slag, and remove impurities in iron-based superalloy liquid; after cleaning slag, sprinkle 0.05%-0.1% iron on the surface of the alloy melt Covering agent to prevent oxygen in the air fro...

Embodiment 2

[0062] Set the density to 2.6g / cm 3 The surface of the C / C-ZrC-SiC composite material is polished, ultrasonically cleaned, and dried in a low-temperature vacuum for use; meanwhile, the Fe-15Cr-25Ni series iron-based superalloy powder is dried in a low-temperature vacuum for use.

[0063] Check the quality of the smelting furnace, bake the furnace at 500°C for 1 hour and use it for later use; meanwhile, clean the crucible tongs and dry them for later use.

[0064] Heat the iron-based superalloy powder in the smelting furnace to 10°C-100°C above the melting point (after about 1650°C), then add a deoxidizer accounting for 0.05% to 0.075% of the alloy melt mass, press it to the bottom with a tool and move slowly until until no bubbling; then add slag breaking agent, fully stir with tools, remove slag, and remove impurities in iron-based superalloy liquid; after cleaning slag, sprinkle 0.05%-0.1% iron on the surface of the alloy melt Covering agent to prevent oxygen in the air fro...

Embodiment 3

[0068] Set the density to 2.6g / cm3 The surface of the C / C-ZrC-SiC composite material is polished, ultrasonically cleaned, and dried in a low-temperature vacuum for use; meanwhile, the Fe-15Cr-25Ni series iron-based superalloy powder is dried in a low-temperature vacuum for use.

[0069] Check the quality of the smelting furnace, bake the furnace at 500°C for 1 hour and use it for later use; meanwhile, clean the crucible tongs and dry them for later use.

[0070] Heat the iron-based superalloy powder in the smelting furnace to 10°C-100°C above the melting point (after about 1650°C), then add a deoxidizer accounting for 0.05% to 0.075% of the alloy melt mass, press it to the bottom with a tool and move slowly until until no bubbling; then add slag breaking agent, fully stir with tools, remove slag, and remove impurities in iron-based superalloy liquid; after cleaning slag, sprinkle 0.05%-0.1% iron on the surface of the alloy melt Coating agent % to prevent oxygen in the air from...

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Abstract

The invention discloses a C/C-ZrC-SiC surface-layer iron-based alloy modified composite material and a preparation method thereof. The composite material comprises a C/C-ZrC-SiC matrix and a modifiedlayer; and the modified layer is an iron-based high-temperature alloy and uniformly fills and seals the surface layer of the matrix through a low-pressure suspension infiltration technology. A preparation technology for the composite material is characterized in that a blank is immersed into an iron-based high-temperature alloy melt to be subjected to low-pressure suspension infiltration, and themelt temperature is controlled to be 1545-1635 DEG C so as to obtain the C/C-ZrC-SiC surface-layer iron-based high-temperature alloy modified composite material. The composite material has the advantages that the iron-based high-temperature alloy is uniformly distributed on the surface layer of the matrix, the surface density is increased, the heat dissipation quantity is large in the evaporationprocess, so that the surface temperature of the matrix can be lowered, in addition, high-temperature and high-speed air flow washout can be resisted, the damage to the matrix caused by mechanical erosion can be avoided, and meanwhile, the high-temperature creep resistant performance of the iron-based high-temperature alloy is excellent, so that the defects of the matrix in strength and toughness can be overcome. The preparation method has the advantages of being simple in technological process, short in period, wide in application size range of workpieces and novel in ablation mechanism.

Description

technical field [0001] The invention relates to a C / C-ZrC-SiC surface layer iron-based alloy modified composite material and a preparation method thereof, belonging to the technical field of composite material and coating preparation. Background technique [0002] C / C-ZrC-SiC is a new type of high-temperature composite material developed on the basis of C / C composite materials that can work in an aerobic ultra-high temperature environment for a long time. Its matrix is ​​composed of ZrC-SiC anti-oxidation and anti-ablation ceramic composite phase and carbon The phase composition and carbon fiber skeleton are used as the reinforcing phase. This material has excellent properties such as low density, high strength, high temperature particle erosion resistance, ablation resistance, oxidation resistance, and thermal shock resistance. It can be widely used in aerospace hot-end components. [0003] The research on the anti-oxidation and anti-ablation mechanism of C / C-ZrC-SiC compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/14C23C2/04C22C101/10
CPCC22C49/14C23C2/04
Inventor 孙威田甜熊翔徐永龙
Owner CENT SOUTH UNIV
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