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Preparation method of in-situ growth graphene/carbon nano tube reinforced Ti-based brazing filler metal

A technology of in-situ growth of carbon nanotubes, applied in the direction of welding/cutting media/materials, welding media, metal processing equipment, etc., can solve problems such as difficulty in uniform dispersion, poor high-temperature mechanical properties, high thermal expansion coefficient, etc., and achieve lower working temperature , excellent high temperature strength, and the effect of improving high temperature mechanical properties

Active Publication Date: 2016-03-16
HARBIN INST OF TECH
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  • Summary
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  • Claims
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Problems solved by technology

[0004] The present invention solves the problems that existing graphene and carbon nanotubes are difficult to uniformly disperse in Ti-based solder and traditional Ti-based solder has a high thermal expansion coefficient and poor high-temperature mechanical properties, and provides in-situ grown graphene / carbon nanotubes Method for Reinforcing Ti-Based Solder

Method used

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specific Embodiment approach 1

[0029] Specific embodiment one: the in-situ growth graphene / carbon nanotube described in the present embodiment strengthens the method for Ti-based solder, specifically carries out according to the following steps:

[0030] 1. Ni(NO 3 ) 2 ·6H 2 O and TiH 2 The powder is mixed in absolute ethanol, then magnetically stirred at a temperature of 80°C to 100°C until the absolute ethanol is completely volatilized, and then ground to obtain Ni(NO 3 ) 2 ·TiH 2 Composite powder;

[0031] The Ni(NO 3 ) 2 ·6H 2 O and TiH 2 The mass ratio of powder is 1:(1~10);

[0032] Second, the Ni(NO 3 ) 2 ·TiH 2 The composite powder is placed in a plasma-enhanced chemical vapor deposition vacuum device, evacuated to below 5Pa, and hydrogen gas is introduced at a gas flow rate of 10sccm to 40sccm, and the pressure in the plasma-enhanced chemical vapor deposition vacuum device is adjusted to 100Pa to 400Pa. 100Pa~400Pa and hydrogen atmosphere, the temperature is raised to 500℃~560℃ at a h...

specific Embodiment approach 2

[0049] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step two, the gas flow rate is 20sccm to pass into hydrogen gas, and the pressure in the plasma enhanced chemical vapor deposition vacuum device is adjusted to be 300Pa, and when the pressure is 300Pa and hydrogen gas Under the atmosphere, the temperature was raised to 520° C. at a heating rate of 20° C. / min. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0050] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step 2, the gas flow rate is 25 sccm to feed hydrogen, and the pressure in the plasma-enhanced chemical vapor deposition vacuum device is adjusted to be 200 Pa, and at the pressure The temperature was raised to 550° C. at a rate of 20° C. / min under a hydrogen atmosphere of 200 Pa. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of Ti-based brazing filler metal, in particular to a preparation method of in-situ growth graphene / carbon nano tube reinforced Ti-based brazing filler metal, so as to solve the problems that the conventional graphene and carbon nano tubes can not be dispersed easily or uniformly in the Ti-based brazing filler metal and the traditional Ti-based brazing filler metal is high in thermal expansion coefficient and poor in high temperature mechanical properties. The preparation method of the in-situ growth graphene / carbon nano tube reinforced Ti-based brazing filler metal comprises the steps that firstly, TiH2 powder is mixed with Ni(NO3)2.6H2O by taking alcohol as a solvent, magnetic stirring and heating are conducted till absolute ethyl alcohol is volatilized and Ni(NO3)2 / TiH2 composite powder is obtained; secondly, graphene / carbon nano tube reinforced TiH2 powder is prepared by adopting a plasma-enhanced chemical vapor deposition method; and thirdly, the prepared graphene / carbon nano tube reinforced TiH2 powder is mixed with metal powder and abraded sufficiently, and the graphene / carbon nano tube reinforced Ti-based brazing filler metal is obtained. The above scheme is applied to the preparation method of the in-situ growth graphene / carbon nano tube reinforced Ti-based brazing filler metal.

Description

technical field [0001] The invention relates to a preparation method of Ti-based solder. Background technique [0002] For a long time, the connection between ceramics and metals has been the focus of research in the field of welding technology. Among the many connection methods, brazing has become the main method for connecting ceramics and metals due to its simple process and good mechanical properties of the joints. At present, in many cases, ceramic-metal connecting components need to be used in high-temperature environments, and existing studies have shown that the high-temperature usability of ceramic-metal connecting components depends critically on the high-temperature mechanical properties of the solder, but due to the high-temperature mechanical properties of the ceramic and metal Due to the large difference in thermal expansion coefficient, the large residual stress generated in the joint will greatly reduce the high-temperature mechanical properties of the compon...

Claims

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Application Information

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IPC IPC(8): B23K35/40
CPCB23K35/40
Inventor 亓钧雷王泽宇范增奇林景煌张骜天冯吉才
Owner HARBIN INST OF TECH
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