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a composite solder
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A hybrid welding and proportional mixing technology, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of complex preparation process, troublesome preparation and high cost, and achieve simple solder preparation process, low process cost, high cost, etc. The effect of high joint strength
Inactive Publication Date: 2016-11-30
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology
Therefore, AgCuTi solder cannot meet the needs of connectors for nuclear fusion
The preparation of other solders and amorphous TiZrCuNi brazing filler metals is cumbersome. The metal or alloy needs to be smelted first, and then made into powder or foil. The preparation process is more complicated, so the cost is higher
Also, reactive solders do not solve the problem of relieving residual thermal stress in graphite / copper joints
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Embodiment 1
[0027] Example 1 Preparation of graphite / oxygen-free copper joints using the composite solder provided by the present invention
[0028] Composite solder provided by the invention is used for the processing steps of preparing graphite / oxygen-free copper as follows:
[0029] (A) Preparation of composite solder,
[0030] Select Cu powder and TiH with a particle size of 15-50 μm 2 powder and carbon powder, Cu powder, TiH 2 Powder and carbon powder are mixed in a certain proportion, among them, Cu powder and TiH 2 The mass ratio of the powder is 1:1, and the mass fraction of carbon powder in the composite solder is 2.8%; the mixed powder is mixed in alcohol with ultrasonic vibration for 30 minutes; then the powder is dried, and the mixed powder is dried and poured into a mortar to continue Grind for 30min to obtain (Cu-TiH 2 )+C composite solder.
[0031] (B) connection surface pretreatment,
[0032] Grind the connecting end faces of graphite and oxygen-free copper, clean th...
Embodiment 2
[0040] Example 2 Preparation of graphite / CuCrZr alloy joints using the composite solder provided by the present invention
[0041] Composite solder provided by the invention is used for the processing step of graphite / CuCrZr alloy joint preparation as follows:
[0042] (A) Preparation of composite solder,
[0043] Select Cu powder and TiH with a particle size of 15-50 μm 2 powder and carbon powder, Cu powder, TiH 2 Cu powder and carbon powder are mixed according to the following ratio, among them, Cu powder and TiH 2The ratio of the powder is 1:1, and the mass fraction of carbon powder in the composite solder is 2%; the mixed powder is mixed in alcohol with ultrasonic vibration for 20 minutes; then the powder is dried, and the mixed powder is poured into a mortar after drying for 30 minutes to obtain (Cu-TiH 2 )+C composite solder.
[0044] (B) connection surface pretreatment,
[0045] Grind the connecting end faces of graphite and CuCrZr, clean them ultrasonically in al...
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Abstract
The invention relates to a preparation method of a graphite / copper connector. The preparation method comprises the following steps that (1) Cu powder, TiH2 powder and carbon powder are selected and mixed, ultrasonic vibration mixing is carried out, and the powder is dried and then poured into a mortar and continue to be grinded to obtain (Cu-TiH2) / C composite solder; (2) the connecting end face of graphite and the connecting end face of copper are grinded, cleaned through ultrasonic waves and dried for standby application; (3) an appropriate amount of composite solder is taken and added into a glycerol solvent to be blended into thick paste, then the connecting end faces are coated with the thick paste, the two connecting end faces are combined and arranged in a graphite die, pressure is applied to a connecting piece, then the connecting piece is put into a high-temperature vacuum furnace to carry out connection, temperature is kept, then the connecting piece is cooled to room temperature and taken out, and the graphite / copper connector is obtained. The welding method for the graphite / copper connector has the advantages that the preparation technology of the solder is easy, the method is used for preparing the graphite / copper connector, the intensity of the connector is high, and the intensity of the connector can reach 83%-91% of that of a graphite base material.
Description
technical field [0001] The invention belongs to the technical field of solder preparation for dissimilar material brazing, and relates to the preparation of graphite / copper joints, in particular to a composite solder used for preparing graphite / copper joints. Background technique [0002] Graphite has the characteristics of light weight, high specific strength, heat resistance, corrosion resistance, good electrical and thermal conductivity, and excellent thermal shock resistance, and is widely used in industry. In the preparation of new carbon commutators for automobiles, it is necessary to connect graphite with copper to improve the wear resistance of the commutator and prolong its service life. In addition, when carbon materials are used as plasma-facing materials in nuclear fusion, they need to be connected to copper heat sinks with high thermal conductivity to enhance heat dissipation. [0003] However, the wettability of copper on the surface of graphite is poor, and t...
Claims
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