Vacuum brazing

Vacuum Brazing Furnace. The cross sections of a vacuum brazing furnace of the beU-jar type are shown in Eigures 15 and 16. Contamination is very low even when rapidly cycled from one work load to the next. The beU jar can serve on one hearth while another hearth is being loaded for the next operation. 

Sheet for Vacuum Brazing Heat Exchangers Irrigation... 

Fig. 15. A low contamination vacuum brazing furnace for brazing laige metal-to-ceramic joints 1, valve, open (—) and shut (-) 2, LN trap 3,...

Fig. 1 also shows that the emitter and the collector are connected by several units. To reduce the heat conduction loss, Ta tubes called heat-chokes are joined to the both electrodes. Ceramic seal rings are used to insulate the electrodes electrically. Two rings are arranged for Cs vapor tube inlet and electrical leads. Each unit is connected by a electron beam welding or a vacuum brazing method. 

Table3.1-161 Physical properties of noble-metal-contain-ing vacuum braze alloys [1.217, p.560]...

Natural and synthetic diamonds have been used for many years to true up and dress abrasive wheels. These are held in a holder of the required shape by vacuum brazing or held in a powder metal matrix and can be single point tools, multi-point grit tools, blade tools or cluster tools depending on the application (see Fig. 10.10). 

For contour-dependent temperature control, the disassembly of the mold insert into single-layer elements is required (Figure 2.97) and into which the temperature control channel is milled in. Later, these layer elements are connected together in a vacuum brazing technology and then result in a uniform temperature control system. Figure 2.98 shows the comparison between a conventional and a contour-dependent temperature control. 

The hybrid chemically etched/plate formed fin configuration is a three pass cross counter flow design. The core is vacuum brazed and consists of chemically etched water layers, closure bars, formed gas fins, parting sheets, and end sheets. Headers and mounting brackets are welded onto the core. This design was evaluated for three materials, titanium CP-70, stainless steel 347, and nickel alloy 625. 

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