CN1173896C - SiC base composite material and its adhering method to metal - Google Patents
SiC base composite material and its adhering method to metal Download PDFInfo
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- CN1173896C CN1173896C CNB011152133A CN01115213A CN1173896C CN 1173896 C CN1173896 C CN 1173896C CN B011152133 A CNB011152133 A CN B011152133A CN 01115213 A CN01115213 A CN 01115213A CN 1173896 C CN1173896 C CN 1173896C
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Abstract
The present invention relates to a process of preparing SiC base composite materials and a method of adhering SiC base composite materials and metal. The adhering method can also be used for the adhesion of other composite materials and metal. By means of controlling the porosity of a composite material, adhesives with chemical stability and excellent wetting performance to the interface of the composite material are selected, and hot pressing is adopted to make the adhesives penetrate through the pores of the composite material so as to form gradient mesh, namely that the composite material can be adhered directly; through further diffusion welding or friction welding, the composite material can be adhered to metal. The present invention has the advantages of high adhesion strength, high heat shock resistance, aging resistance, simple manufacturing process, etc.
Description
Technical field
The present invention relates to reach between a kind of SiC based composites the adhering method of SiC based composites and metal.
Background technology
The SiC based composites is a ultrahigh-temperature thermal structure material of new generation, has broad application prospects in fields such as aerospace.Although the application of SiC based composites has obtained breakthrough, bonding remaining limited one of its engineering key technologies for application.Though the bonding patented technology of at present both at home and abroad relevant ceramic matric composite is a lot, all concentrates on adhesive material, adhesive linkage structure and preparation method aspect, and bondingly all carry out after preparation finishes, bonding strength is mainly from the chemical reaction combination.In order to alleviate the thermal expansion mismatch of matrix material and adhesive linkage and metal, adhesive linkage is multiwalled always.This not only makes the technique for sticking complexity, and directly causes ceramic matric composite and low with the bonding strength of metal, and thermal shock resistance is poor, and at high temperature diffusion is worn out and lost efficacy easily.
Summary of the invention
The purpose of this invention is to provide the adhering method that reaches SiC based composites and metal between a kind of SiC based composites, this method bonding strength height, technology is simple, and the material thermal shock resistance after bonding is good, and high-temperature stability is good.
The preparation technology of SiC based composites comprises CVI (Chemical vapor infiltration, chemical vapor infiltration), PIP (Polymer precursor impregnation ﹠amp; Pyrolysis, the pyrolysis of precursor dipping), RB (Reaction bonding, reaction sintering) and HP (Hot press, hot pressed sintering).Strengthening body may be continuous fibre, also may be staple fibre or particle.Continuous fibre may be a carbon fiber, also may be silicon carbide fiber.No matter which kind of SiC based composites all has a common ground, and that is exactly to have certain porosity.If the open porosity of control matrix material directly is penetrated in the open pores caking agent in preparation process, will significantly improve bonding strength and thermal shock resistance, reduce high temperature ageing inefficacy tendency, simplify technique for sticking simultaneously.
Control matrix material open porosity has two kinds of approach: a kind of is to stop the Composite Preparation process when having higher open porosity, continues to finish Composite Preparation after waiting to finish bonding process; Another kind is the porosity at the bonding position of control matrix material in preparation process, carries out bonding after the end to be prepared.The control porosity can make the wetting better certain depth that penetrates into hole of caking agent, makes caking agent as tree root and dental nerve composite implant material.The bonding main dependence mechanical snap and the chemical bonding of control porosity are only required good wettability, and are not required the generation chemical reaction between caking agent and the matrix material.
CVI and PIP prepared SiC based composites temperature are low, and preparation process can be to the bonding disadvantageous effect that causes, thereby can carry out proceeding densification after bonding.CVI and PIP technology can be controlled porosity easily, realize the porosity gradient at bonding position, thereby matrix material also can carry out bonding after preparation finishes.
Adopt heat pressing process not only can reduce the infiltration temperature of caking agent, alleviate the thermal expansion mismatch of caking agent and matrix material, and can quicken the process of osmosis of caking agent, prevent disadvantageous chemical reaction and diffusion between caking agent and the matrix material.If carry out bonding between the matrix material, only need caking agent is placed between the matrix material, directly carry out hot pressing and get final product.Owing to have thermal expansion mismatch between caking agent and the matrix material, after the hot pressing on the bonding interface residual bond layer get over Bao Yuehao.If carry out bonding between matrix material and the metal, then need to implement in two steps.The first step is to realize the bonding of caking agent and matrix material by hot pressing, and composite material surface stays certain thickness bond layer after the hot pressing.Second step was to use the method for hot pressing diffusion welding or friction welding (FW) to realize the bonding of caking agent and metal.No matter carry out diffusion welding or friction welding (FW), caking agent and metallic surface all need process and handle.
For the high temperature ageing that prevents caking agent and composite material interface lost efficacy, quicken the process of osmosis of caking agent and increase depth of penetration, improve bonding strength, caking agent should satisfy two conditions: between (1) caking agent and the matrix material significant chemical reaction can not take place; (2) caking agent and matrix material should have good wettability.Except having certain chemical bonding, do not have tangible surface reaction between Ni and the SiC based composites, but the wettability between Ni and the SiC based composites is relatively poor.In Ni, add some active elements such as Ti etc., can make Ni good at the SiC moistened surface.Therefore, the Ni alloy is a kind of comparatively ideal caking agent of SiC based composites.
The adhering method of SiC based composites provided by the invention and SiC based composites, this method comprises step in the following order:
(1) adopt CVI method or PIP legal system to be equipped with C/SiC matrix material test specimen, the porosity of control C/SiC is 20～25%;
(2) with C/SiC test specimen and Ni alloy combination together, place hot pressing furnace, carry out the hot pressing infiltration in the vacuum medium, hot pressing temperature is 1250～1350 ℃, and pressure is 30MPa, and the time is 5～15 minutes;
(3) the SiC based composites and the SiC based composites is bonding finish after, again test specimen is placed chemical vapour deposition (CVI) stove to carry out densification.
The adhering method of SiC based composites provided by the invention and metallic substance, this method comprises step in the following order:
(1) adopt CVI method or PIP legal system to be equipped with C/SiC based composites test specimen, the porosity of control C/SiC is 20～25%;
(2) C/SiC based composites test specimen and Ni group of alloys are loaded in the graphite jig, permeate bondingly then in vacuum hotpressing stove, hot pressing temperature is 1250～1300 ℃, and pressure is 20MPa, and the time is 5～10 minutes;
(3) the Ni alloy layer is carried out after surface decontamination handles, with test specimen and Ti alloy combination together, carry out hot pressing diffusion welding or friction welding (FW).
Because it is bonding that the gradient interlock that caking agent and SiC based composites dependence infiltration form and certain chemical bonding are realized, therefore, the present invention has following significant advantage: (1) bonding strength height; (2) thermal shock resistance is good; (3) high-temperature stability is good; (4) technique for sticking is simple.
Description of drawings
Fig. 1 is for carrying out the microstructure change process synoptic diagram of bonding back material by the bonding position of control matrix material porosity gradient.
Fig. 2 is bonding for utilizing the matrix material with higher porosity to carry out, and carries out the microstructure change process synoptic diagram of material after the matrix material densification then.
Fig. 3 is for having the microstructure change process synoptic diagram that carries out bonding back material between the matrix material of porosity gradient by the hot pressing infiltration.
Fig. 4 for by hot pressing infiltration at the microstructure change process synoptic diagram that is connected the back material between the matrix material with porosity gradient and the metallic substance.。
Fig. 5 is the adhering method process flow sheet of C/SiC and C/SiC matrix material.
Fig. 6 is the adhering method process flow sheet of C/SiC and Ti alloy material.
Among the figure, 1-caking agent, 2-densification matrix material, 3-low-density composite, 4-metallic substance, 5-graphite pads, 6-graphite core, 7-graphite external mold, 8-graphite pressure ring.
Embodiment
Below, in conjunction with the accompanying drawings enforcement of the present invention is further described.
Embodiment 1-C/SiC and C/SiC matrix material bonding
As Fig. 5, adopt CVI method or PIP legal system to be equipped with C/SiC based composites test specimen, the porosity of control C/SiC is 20～25%; Test specimen is an annular.With low density C/SiC test specimen and Ni alloy combination together, place hot pressing furnace, in the vacuum medium, carry out the hot pressing infiltration.Hot pressing temperature is 1250～1350 ℃, and pressure is 30MPa, and the time is 5～15 minutes.After bonding the finishing, test specimen is placed chemical gas phase (CVI) stove to carry out densification, depositing used precursor is monomethyl trichlorosilane (CH again
3SiCl
3, MTS), 1000 ℃ of depositing temperatures, time 20～50h, atmosphere pressures are 3kPa, H
2Airshed 200～350mlmin
-1, H
2Compare greater than 10 with the molar mass of MTS, the porosity of SiC is 15～18% after the densification.
Embodiment 2-C/SiC and Ti alloy bonding
As Fig. 6, C/SiC based composites test specimen and Ni group of alloys are loaded in the graphite jig, in vacuum hotpressing stove, permeate bonding then.Hot pressing temperature is 1250～1300 ℃, and pressure is 20MPa, and the time is 5～10 minutes.The control heat pressing process makes and stays the thick Ni alloy layer in the 1.5mm left and right sides on the test specimen bonding plane.After processing, the thickness of Ni alloy layer is 1mm.The Ni alloy layer is carried out test specimen and Ti alloy hoop being combined after surface decontamination handles, in vacuum hotpressing stove, carry out diffusion welding.Hot pressing temperature is 850～1000 ℃, and pressure is 30MPa, and the time is 60～120 minutes.
Claims (2)
1. the adhering method of SiC based composites and SiC based composites comprises step in the following order:
(1) adopt CVI method or PIP legal system to be equipped with C/SiC based composites test specimen, the porosity of control C/SiC is 20～25%;
(2) with C/SiC test specimen and Ni alloy combination together, place hot pressing furnace, carry out the hot pressing infiltration in the vacuum medium, hot pressing temperature is 1250～1350 ℃, and pressure is 30MPa, and the time is 5～15 minutes;
(3) the SiC based composites and the SiC based composites is bonding finish after, again test specimen is placed the chemical gas phase stove to carry out densification.
2. the adhering method of SiC based composites and metallic substance comprises step in the following order:
(1) adopt CVI method or PIP legal system to be equipped with C/SiC based composites test specimen, the porosity of control C/SiC is 20～25%;
(2) C/SiC based composites test specimen and Ni group of alloys are loaded in the graphite jig, permeate bondingly then in vacuum hotpressing stove, hot pressing temperature is 1250～1300 ℃, and pressure is 20MPa, and the time is 5～10 minutes;
(3) the Ni alloy layer is carried out after surface decontamination handles, with test specimen and Ti alloy combination together, carry out hot pressing diffusion welding or friction welding (FW).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011152133A CN1173896C (en) | 2001-04-04 | 2001-04-04 | SiC base composite material and its adhering method to metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011152133A CN1173896C (en) | 2001-04-04 | 2001-04-04 | SiC base composite material and its adhering method to metal |
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| Publication Number | Publication Date |
|---|---|
| CN1377858A CN1377858A (en) | 2002-11-06 |
| CN1173896C true CN1173896C (en) | 2004-11-03 |
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| CNB011152133A Expired - Fee Related CN1173896C (en) | 2001-04-04 | 2001-04-04 | SiC base composite material and its adhering method to metal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7090112B2 (en) * | 2003-08-29 | 2006-08-15 | The Boeing Company | Method and sealant for joints |
| CN1314626C (en) * | 2004-07-27 | 2007-05-09 | 西北工业大学 | Connecting method of ceramic-base composite |
| CN100418651C (en) * | 2006-10-18 | 2008-09-17 | 合肥工业大学 | Composite SiC and its making process |
| CN115095588A (en) * | 2022-06-28 | 2022-09-23 | 西安鑫垚陶瓷复合材料有限公司 | Method for bonding ceramic matrix composite material and metal material and clamp for controlling thickness of adhesive layer |
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2001
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