Compound brazing material for brazing quartz short fiber enhanced silicon dioxide composite material and Invar alloys as well as preparation method thereof
A short fiber reinforced, silica technology, used in welding/cutting media/materials, welding equipment, metal processing equipment, etc., can solve problems such as large brittle compounds, achieve suitable melting point, improve microstructure, and improve mechanical properties. Effect
Active Publication Date: 2018-10-09
HARBIN INST OF TECH
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Problems solved by technology
[0005] The present invention is to solve existing welding SiO 2f / SiO 2 Composite material and Invar alloy, joints above 400 ℃ use active solder to braze the microstructure of the joint to produce a large number of brittle compounds, and provide a method for brazing quartz short fiber reinforced silica composite material (SiO 2f / SiO 2 Composite material) and Invar alloy composite solder and preparation method thereof
Method used
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specific Embodiment approach 1
[0021] Specific embodiment one: the present embodiment is used for brazing quartz short fiber reinforced silica composite material and Invar alloy composite solder is made of Cu powder, few-layer graphene and TiH 2 composition.
specific Embodiment approach 2
[0022] Embodiment 2: This embodiment is different from Embodiment 1 in that: the purity of the Cu powder is 99.0%-99.9%, and the particle size of the Cu powder is 300 mesh. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0023] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the TiH 2 The purity is more than 99%, TiH 2 The particle size is 48-52μm. Others are the same as in the first embodiment.
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Abstract
The invention discloses a compound brazing material for brazing a quartz short fiber enhanced silicon dioxide composite material and Invar alloys as well as a preparation method thereof, and relates to the compound brazing material and the preparation method thereof. In order to solve the problem that a large quantity of fragile compounds are produced because joint micro-structures of joints are brazed by adopting an active brazing material at a temperature of 400 DEG C or above in an existing welding technology of an SiO2f / SiO2 composite material and the Invar alloys, the compound brazing material is prepared from Cu powder, few-layer graphene and TiH2. The method comprises the following steps: 1, weighing the Cu powder and the TiH2 powder; 2, carrying out in-situ growth on graphene by adopting a CuTi brazing material; and 3, mechanically mixing VFG / Cu powder with the TiH2 powder. The joints brazed by adopting the brazing material disclosed by the invention have the advantages that the shearing strength is improved from original 5MPa to 15MPa, and the amplitude of the improvement is 200 percent. The compound brazing material disclosed by the invention is applied to the field of brazing materials.
Description
technical field [0001] The invention relates to a composite solder and a preparation method thereof. Background technique [0002] With the rapid development of the aerospace field in recent years, people pay more and more attention to its advanced materials, and higher requirements are put forward for advanced ceramic matrix composite materials. Quartz has the characteristics of high light transmittance, high hardness, and high corrosion resistance, making it widely used in the fields of electronics, communications, and optical instruments. However, the fracture toughness and bending strength cannot meet the requirements of the harsh conditions of aerospace. SiO 2f / SiO 2 (SiO 2 Short Fiber Reinforced and Toughened SiO 2 Ceramic matrix composites) have been gradually explored by people. It is obtained through the infiltration and sintering method of silica sol, with silica ceramics as the matrix and two-dimensional braided quartz fibers as the reinforcing phase. It is...
Claims
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Login to View More IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/302B23K35/40
Inventor 孙湛刘显鹏张丽霞郝通达
Owner HARBIN INST OF TECH