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Liquid suction casting preparation method of SiC fiber reinforced TiAl-based composite material

A composite material and fiber reinforced technology, which is applied in the field of liquid suction casting preparation of SiC fiber reinforced TiAl matrix composite materials, can solve the problems of high melt viscosity, poor fluidity, difficulty, etc., and achieve fast alloy solidification speed and reduce production. Cost, effect of avoiding interface reaction

Active Publication Date: 2019-06-04
江苏华钛瑞翔科技有限公司
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AI Technical Summary

Problems solved by technology

Due to its high activity, titanium alloy is easy to react with the graphite nozzle in the traditional suction casting method, and the melt viscosity is high, and the fluidity is relatively poor, so it is difficult to prepare by the traditional suction casting method

Method used

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  • Liquid suction casting preparation method of SiC fiber reinforced TiAl-based composite material
  • Liquid suction casting preparation method of SiC fiber reinforced TiAl-based composite material
  • Liquid suction casting preparation method of SiC fiber reinforced TiAl-based composite material

Examples

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Embodiment

[0035] In this example, the selected matrix alloy composition is Ti-48Al-2Cr-2Nb, and the prepared composite material is a round rod with a diameter of 9 mm and a length of 90 mm, and a bundle of SiC fibers is added within the diameter of the center of the round rod within 1 mm.

[0036] (1) Non-consumable vacuum arc melting master alloy. Using Al-Nb master alloy, electrolytic Cr, Al sheet, and small particle sponge titanium as raw materials, calculate the required mass fraction of alloying elements according to the atomic percentage of the alloy composition, calculate the required mass of each alloying element, and prepare the alloy. Put the required raw materials into a water-cooled copper crucible in an electric arc furnace, and evacuate to 9.9×10 - 4 Pa, start smelting under the protection of inert gas Ar, and add electromagnetic stirring to smelt repeatedly 6 times to ensure that the composition of the alloy ingot is uniform.

[0037] (2) Design of fiber volume fraction...

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Abstract

The invention relates to the field of casting and composite material preparation, in particular to a liquid suction casting preparation method of a SiC fiber reinforced TiAl-based composite material.The liquid suction casting preparation method solves the problems that the process of a traditional solid state preparation method is complicated, the cost is high, the composite material is prone tobe polluted to cause poor mechanical properties, and complicated parts are difficult to mold. The liquid suction casting preparation method comprises the steps of (1) non-consumable vacuum arc meltingof a master alloy, (2) fiber volume fraction and distribution design, (3) fiber tensioning and positioning, (4) vacuum suction casting, (5) hot isostatic pressing and the like, and the SiC fiber reinforced TiAl-based composite material is prepared. Compared with a conventional method, the composite material prepared by the liquid suction casting preparation method has the advantages of simple preparation process, few alloy defects, tight bonding of fiber and a matrix alloy, moderate reaction and cleanness and no pollution of the composite material.

Description

technical field [0001] The invention relates to the field of casting and preparation of composite materials, in particular to a method for preparing SiC fiber-reinforced TiAl-based composite materials by liquid suction casting. Background technique [0002] TiAl intermetallic compound is considered as an ideal lightweight high-temperature material because of its low density, high specific strength, high specific modulus, excellent creep resistance and oxidation resistance, and can be replaced between 600 ° C and 900 ° C Nickel-based superalloys are used to make aerospace structural parts and ground system rotating or reciprocating structural parts, which can greatly improve the thrust-to-weight ratio and fuel efficiency. It has been applied to the advanced aero-engine of GE Company of the United States, and the third-stage rotor blade of the high-speed three-rotor low-pressure turbine of the new geared fan engine. However, due to the significant decline in the high-temperat...

Claims

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Application Information

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IPC IPC(8): C22C47/12C22C49/11C22C49/06B22D18/06C22C101/14
Inventor 贾清沈莹莹王玉敏崔玉友杨锐
Owner 江苏华钛瑞翔科技有限公司
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