Method for brazing SiO2f/SiO2 composite ceramic and metal material

Abstract

The invention discloses a method for brazing a SiO2f / SiO2 composite ceramic and a metal material. The method comprises the following steps of: uniformly processing a plurality of open grooves in a surface to be brazed of the SiO2f / SiO2 composite ceramic; correspondingly singly processing mosaic blocks of which the sizes are matched with those of the open grooves and the quantity is the same as that of the open grooves; assembling the mosaic blocks into the open grooves in the surface layer of the brazed SiO2f / SiO2 composite ceramic one by one; filling AgCu-based active solders on an interface between each metal mosaic block and each open groove and on the interface to be brazed between the brazed SiO2f / SiO2 composite ceramic and the brazed metal material; and effectively binding the SiO2f / SiO2 composite ceramic of a large size with the metal material in a vacuum brazing heating mode. The method is also suitable for binding between C / C composite materials, Cf / SiC composite materials, SiCf / SiC composite materials, Al2O3 ceramics, SiC ceramics as well as Sialon ceramics of the larger size and the metal material.

Description

technical field [0001] The present invention is a SiO 2f / SiO 2 The invention relates to a brazing method for composite ceramics and metal materials, which belongs to the technical field of welding. Background technique [0002] Quartz fiber reinforced quartz composite ceramics (SiO 2f / SiO 2 ) is a promising high-temperature structural ceramic matrix composite material. However, due to the special requirements for the combination of performance in some engineering applications, it is necessary to form a composite structure with metal materials for application. [0003] SiO 2f / SiO 2 The connection of composite ceramics is generally suitable for brazing or diffusion welding methods, but direct SiO 2f / SiO 2 The bonding of composite ceramics to metals is very difficult because SiO 2f / SiO 2 The thermal expansion coefficients of composite ceramics and metals are very different (the former is about 0.3×10 -6 K -1 , the latter is generally about 5.5~15×10 -6 K -1 ,...

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Invention patent (inventors: Xiong Huaping, Chen Bo, Cheng Yaoyong, Li Xiaohong, Mao Wei. A kind of SiO 2f / SiO 2 Brazing process of composite ceramics and metal materials, patent application date: August 31, 2010, patent number: ZL 2010 1 0266686.0, authorization announcement date: September 26, 2012) It is proposed that the SiO 2f / SiO 2 The surface to be welded of the composite ceramics is grooved, and then the AgCu-Ti active solder is placed on the SiO 2f / SiO 2 At the groove of the surface of the composite ceramic to be welded, and in the welded SiO 2f / SiO 2 Add AgCu-Ti solder to the interface to be welded between the composite ceramic and the metal material to be welded, and then heat through vacuum brazing to realize SiO 2f / SiO 2 Effective connection of composite ceramics and metal materials, this method is effective and feasible for test plates of small size (the length of the brazing seam is at the millimeter level or more than a dozen millimeters), while for larger sizes (the length of the brazing seam is at the upper 100 mm scale) SiO 2f / SiO 2 For the brazing connection of composite ceramics and metal materials, there is no effective method to relieve the residual thermal stress of the joint after welding.

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