The temperature of vacuum brazing varies depending on the materials being brazed, but it typically involves temperatures in excess of 1000°C. For specific materials, the temperatures are as follows:
- Aluminum and Aluminum Alloys: The parts are heated to 575-590°C (1070-1100°F), with critical temperature uniformity of ±5.5°C (±10°F) or better.
- Copper and Copper Alloys: The furnace is heated to a brazing temperature of 1100–1120°C (2000–2050°F) under an inert-gas partial pressure to inhibit evaporation of the copper.
- Stainless Steels: The use of high-temperature brazing filler metals typically involves temperatures in excess of 1000°C.
Explanation:
- Aluminum and Aluminum Alloys: The specified temperature range ensures proper bonding without damaging the aluminum components. The strict temperature uniformity requirement is crucial for maintaining the integrity and strength of the brazed joints.
- Copper and Copper Alloys: The higher brazing temperature is necessary due to copper's high vapor pressure at its melting point. The use of an inert gas partial pressure helps prevent the evaporation of copper, which could contaminate the furnace and affect the quality of the brazed joints.
- Stainless Steels: The high brazing temperatures are required to effectively melt the brazing filler metals and ensure a strong bond. These temperatures also allow for the possibility of integrating heat treatments into the brazing cycle, enhancing the mechanical properties of the materials.
Correctness Review: The information provided is consistent with typical vacuum brazing practices and the specific requirements for different materials. The temperatures and conditions described are appropriate for achieving successful brazing outcomes without compromising the materials' properties.
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