A kind of high-temperature solder for brazing non-oxide ceramics and composite materials and its preparation method

A non-oxide, high-temperature solder technology, applied in welding/cutting media/materials, welding equipment, welding media, etc., can solve problems such as unreliable performance, avoid the formation of brittle phases, promote interfacial metallurgical reactions, and reduce costs cheap effect

Active Publication Date: 2014-10-15
HARBIN INST OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of unreliable performance of high-temperature brazing filler metals for welding non-oxide ceramics and composite materials in the existing joints above 500°C, and provides a high-temperature brazing filler metal for brazing non-oxide ceramics and composite materials and a preparation method thereof

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  • A kind of high-temperature solder for brazing non-oxide ceramics and composite materials and its preparation method

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specific Embodiment approach 1

[0013] Specific Embodiment 1: A kind of high-temperature solder for brazing non-oxide ceramics and composite materials in this embodiment is composed of 47 to 52 parts of Ni, 25 to 28 parts of Cr, 18 to 21 parts of Nb, 0~2 parts of B, 0~2 parts of Ti and 0~6 parts of W.

[0014] The brazing filler metal of this embodiment has a suitable melting point and good wettability for brazing connection of non-oxide ceramics and their composite materials with various high-temperature alloys, and can meet the requirement of brazing joints at 800°C. Moreover, the brazing filler metal of this embodiment does not contain precious metals such as Ag and Pd, and the cost is low. Compared with other commercial nickel-based solders, the nickel-based solder used in the present invention does not rely on high content of Si or B to reduce the melting point of the solder, but relies on Ni, Cr, Nb ternary eutectic reaction in brazing The liquid phase is formed at high temperature, and the content an...

specific Embodiment approach 2

[0016] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the purity of Ni is 99.0%~99.9%, the purity of Cr is 99.0%~99.9%, the purity of Nb is 99.0%~99.9%, The purity of B is 99.0%~99.9%, the purity of Ti is 99.0%~99.9% and the purity of W is 99.0%~99.9%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiments one to two is that the high-temperature solder is composed of 48 parts of Ni, 25.5 parts of Cr, 18.5 parts of Nb, 2 parts of B, 2 parts by mass percentage. Parts of Ti and 6 parts of W. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention provides a high temperature brazing filler metal for brazing a non-oxide ceramic and a composite material as well as a preparation method of the high temperature brazing filler metal, relating to a high temperature brazing filler metal and a preparation method thereof. The invention aims to solve a problem that the property of the high temperature brazing filler metal in the traditional welding joint between the non-oxide ceramic and the composite material is unreliable at more than 500 DEG C. According to the invention, the high temperature brazing filler metal comprises the following components in parts by weight: 47-52 parts of Ni, 25-28 parts of Cr,18-21 parts of Nb, 0-2 parts of B, 0-2 parts of Ti and 0-6 parts of W; and the preparation method comprises the following steps of: (1) weighing the components and mixing the components to obtain a mixed material; and (2) putting the mixed material into a grinding ball according to a ball material mass ratio of (8-20):1, intermittently ball-milling the mixed material for 4-20 h at a speed of 250-350 r / min to reach a filler ratio of 45-55%, so as to obtain the high temperature brazing filler metal. The shear strengths of the joint obtained according to the invention at room temperature and high temperature of 800 DEG C are respectively 18-48 MPa and 11-27 MPa. The high temperature brazing filler metal for brazing the non-oxide ceramic and the composite material as well as the preparation method of the high temperature brazing filler metal, provided by the invention, are applied to the aerospace field.

Description

technical field [0001] The invention relates to a high-temperature solder and a preparation method thereof. Background technique [0002] SiC, Si 3 N 4 , ZrB 2 Non-oxide ceramics are important ultra-high temperature structural materials in the aerospace field. C / SiC composite materials, ZSC composite materials, etc., further improve the mechanical properties and high temperature oxidation resistance of the materials by adding a certain volume fraction of C fibers or other ceramic particles (graphite) reinforcement phases to the single-phase ceramic matrix. Due to the limitations of the preparation and forming methods of these non-oxide ceramics and their composites, realizing their connection with themselves or with other materials is the key to ensure their wide application in the above fields. [0003] The currently reported connection methods for ceramics and ceramic matrix composites include: mechanical connection, diffusion welding and brazing. However, there are p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K1/00B02C17/10
Inventor 张丽霞李宏伟石俊秒田晓羽曹健冯吉才
Owner HARBIN INST OF TECH
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