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Diffusion connection method of carbide ceramic

A diffusion bonding and carbide technology, applied in the field of carbide ceramic welding, can solve problems such as uneven structure, and achieve the effects of improving high temperature mechanical properties, reliable connection, and improving room temperature mechanical properties

Inactive Publication Date: 2013-04-17
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to solve the problem that the residual metal intermediate layer is formed in the welding joint and the structure is not uniform when the existing metal intermediate layer is used to connect carbide ceramics and composite ceramics, and to provide a method for diffusion bonding of carbide ceramics

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  • Diffusion connection method of carbide ceramic
  • Diffusion connection method of carbide ceramic

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specific Embodiment approach 1

[0010] Specific Embodiment 1: This embodiment is a diffusion bonding method of carbide ceramics, which is specifically completed according to the following steps: 1. Surface cleaning: first use mechanical grinding or organic solution to treat the surfaces of two carbide ceramics to be welded. Carry out cleaning, obtain the carbide ceramics after two surface cleanings; Two, electroplating Ni metal layer: adopt electroplating method to electroplating Ni metal layer on the carbide ceramic surface after two surface cleanings, the thickness of the Ni metal layer of electroplating is 2 μ m~50 μ m, obtain Two carbide ceramics with a Ni metal layer; 3. Welding: Firstly, two carbide ceramics with a Ni metal layer are fixed butt jointed, then assembled in a graphite fixture and placed in a vacuum diffusion welding furnace, and then placed in a vacuum diffusion welding furnace. The welding pressure is 5MPa~20MPa, and the vacuum degree is 0.5×10 -3 Pa~1.5×10 -3 Pa and heating rate of 10 ...

specific Embodiment approach 2

[0016] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the carbide ceramics to be welded described in step one is ZrC ceramics, TiC ceramics, SiC ceramics, WC ceramics, HfC ceramics, TaC ceramics, ZrC ceramics -SiC composite ceramics, ZrC-ZrB 2 -SiC composite ceramics, TiC-SiC composite ceramics or SiC-ZrB2 Composite ceramics. Others are the same as the first embodiment.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the adopting process of the mechanical grinding described in step one is as follows: first use 240#~1000# diamond grinding disc to polish the surface of the ceramic material to be welded , and then use 800#~1200# water sandpaper to further finely grind the surface to be welded, that is, complete mechanical grinding. Others are the same as those in Embodiment 1 or 2.

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Abstract

A diffusion connection method of carbide ceramic relates to a carbide ceramic welding method. The diffusion connection method aims at solving the problem that when a metal middle layer is used for connecting the carbide ceramic and composite ceramic, a residual metal middle layer is formed in a welded joint, and the structure of the welded joint is inhomogenous. The diffusion connection method comprises the steps of: 1, carrying out surface cleaning; 2, electroplating a Ni metal layer; and 3, welding, thus completing the diffusion connection of the carbide ceramic. The diffusion connection method has the advantages that 1, the welded joint without the residual middle layer and with the homogeneous structure is formed, the welding residual stress caused by the residual middle layer in a common diffusion welding joint is relieved, the room-temperature mechanical property of the welded joint is increased, and the high-temperature mechanical property and oxidation resistance of the welded joint are also increased; and 2, the diffusion connection method is simple and practicable without needing complex working procedures and equipments. The diffusion connection method of the carbide ceramic, provided by the invention, is mainly used for diffusion welding of the carbide ceramic.

Description

technical field [0001] The invention relates to a carbide ceramic welding method. Background technique [0002] Carbide ceramics and their composite ceramics are important high-temperature and ultra-high-temperature structural materials. They have the advantages of high melting point, high hardness, corrosion resistance, wear resistance, and good electrical and thermal conductivity. They are used in aerospace, weaponry, petrochemical and It has broad application prospects in industrial manufacturing and other fields. Due to the inherent brittleness of ceramic materials and the limitation of preparation methods, it is difficult to obtain large-sized and complex-shaped ceramic components. Therefore, the realization of such ceramics and the reliable connection between ceramics and other materials is a prerequisite for their application. [0003] At present, the literature reports on the connection of ceramics and ceramics to metal materials mainly include diffusion welding and...

Claims

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Application Information

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IPC IPC(8): C04B37/00
Inventor 何鹏林铁松宋昌宝
Owner HARBIN INST OF TECH
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