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MAX phase ceramic material welding method

A technology of ceramic materials and welding methods, which is applied in the welding field of MAX-phase ceramic materials, can solve the problems of reduced efficiency, high equipment requirements, and increased costs, and achieve the effects of enhanced bending strength, high flexibility, and short welding cycles

Active Publication Date: 2015-05-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in practical applications, the above method requires an intermediate transition layer, which further complicates the welding process; moreover, it requires the combined action of temperature-pressure-holding time to achieve it, so the equipment is required to provide high temperature and pressure at the same time. In addition, it needs to keep warm for a long time, resulting in increased cost and reduced efficiency, so it is not suitable for welding and field welding operations of large MAX phase ceramic workpieces

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Embodiment 1

[0031] In this embodiment, both the first MAX phase ceramic material 1 and the second MAX phase ceramic material 2 are Ti 3 SiC 2 bulk material, for two Ti 3 SiC 2 The material is welded, the specific method is as follows:

[0032] (1) Put two pieces of Ti 3 SiC 2 After grinding and polishing the surfaces to be welded of materials 1 and 2, wash them with acetone and deionized water;

[0033] (2) if figure 1 As shown, the two Ti 3 SiC 2 The surfaces of the materials to be welded are aligned and contacted together, and the two Ti 3 SiC 2 The materials are respectively connected with the graphite upper electrode 3 and the graphite lower electrode 4, the power supply 5, the graphite upper electrode 3, two pieces of Ti 3 SiC 2 Materials 1 and 2 and graphite lower electrode 4 form a closed loop;

[0034](3) Through graphite electrodes 3 and 4 on two pieces of Ti 3 SiC 2 Apply a pressure of 13MPa on materials 1 and 2;

[0035] (4) Apply current to the whole system, Ti ...

Embodiment 2

[0039] In this embodiment, both the first MAX phase ceramic material 1 and the second MAX phase ceramic material 2 are Ti 3 SiC 2 bulk material, for two Ti 3 SiC 2 The material is welded, the specific method is basically the same as that described in Example 1, the difference is that in step (3), graphite electrodes 3 and 4 are used on two Ti 3 SiC 2 A pressure of 1 MPa is applied to materials 1 and 2; in step (4), the current intensity is loaded to 2.2KA and the current is stopped; the welding process takes 7 minutes.

[0040] Figure 4 is the ti 3 SiC 2 Scanning electron microscope (SEM) photograph of the interface cross-section of the material after welding. It can be seen from the figure that the two Ti 3 SiC 2 The material is connected as one, there is no weld seam at the interface, and there is no interface.

Embodiment 3

[0042] In this embodiment, both the first MAX phase ceramic material 1 and the second MAX phase ceramic material 2 are Ti 3 SiC 2 bulk material, for two Ti 3 SiC 2 The material is welded, the specific method is basically the same as that described in Example 1, the difference is that in step (3), graphite electrodes 3 and 4 are used on two Ti 3 SiC 2 A pressure of 5 MPa is applied to materials 1 and 2; in step (4), the current is stopped after the current intensity reaches 2.5KA; the welding process takes 6 minutes.

[0043] Figure 5 is the ti 3 SiC 2 Scanning electron microscope (SEM) photograph of the interface cross-section of the material after welding. It can be seen from the figure that the two Ti 3 SiC 2 The material is connected as one, there is no weld seam at the interface, and there is no interface.

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Abstract

The invention provides an MAX phase ceramic material welding method. In the provided welding method, the ends of two MAX phase ceramic materials to be welded are respectively connected to an upper electrode and a lower electrode, the welding surfaces are processed and then contacted with each other, then the ceramic materials, electrodes, and a power supply form a closed loop, joule heat is generated by the current on the touch surfaces, the temperature of the touch surface is rapidly raised, thus the MAX phase ceramic material of the touch surface is activated and diffused, and the welding is achieved. In the conventional welding method, a middle transition layer is used, and the middle transition layer is diffused at a high temperature under the combined actions of temperature-pressure-temperature maintaining so as to achieve the welding. Compared with the conventional welding method, the provided welding method has the following advantages: (1) the method is simple and practical; (2) a middle transition layer is not needed; (3) the welding period is short; (4) no welding silt or interface on the surface of welded material, and the ceramic materials are perfectly integrated together; (5) the welding method has a very good application prospect.

Description

technical field [0001] The invention relates to the technical field of MAX phase ceramic materials, in particular to a welding method for MAX phase ceramic materials. Background technique [0002] MAX phase ceramic materials have excellent mechanical properties, oxidation resistance, corrosion resistance, radiation resistance and machinability, and become one of the candidate materials for future nuclear materials. At present, MAX-phase bulk ceramic materials are mainly prepared by pressureless or hot-pressing sintering methods. However, in the actual preparation process, the size of the furnace and mold is limited, so it is difficult to directly prepare large-sized and complex-shaped MAX-phase ceramic materials. The application of this material can be facilitated by the interconnection of materials, that is, the welding of several small pieces of material to form the required large complex shape parts. [0003] At present, there are few studies on the welding of MAX phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
Inventor 黄庆申璐周小兵邓启煌周洁丁志辉
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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