Good Joint Design

Proper Choice of Adhesive Good Joint Design Cleanliness Wetting... 

The alumina-superalloy joints are intended to withstand high service temperatures (700 -1000 C) and thermal cycles typical in power generation processes. The fabrication of a joint should provide a relatively good strength but more important that it will remain relatively stable in the service conditions. Therefore, experimental studies for the joint design optimisation should be carried out and the data for novel procedures and for modelling the FG-structure and FE-analysis should be created. 

As with all bonding operations appropriate surface preparation and joint design is essential to obtain a good bond. Surface preparation is achieved by carrying out a suitable surface pre-treatment such as ... 

The basic requirements for a good bond to plastic substrates are surface cleanliness, wetting of the surface by the adhesive, solidification of the adhesive, and proper selection of adhesive and joint design. These requirements are briefly defined here and then more thoroughly discussed in following sections. 

Figure 2 shows schematic diagrams of some good and poor joint designs related to the preceding comments. It can clearly be seen that the major difference between good and poor is to restrict peel-cleavage stress of the joint. 

Fig. 2. Representations of good and bad joint design. (Reproduced with permission from A J Kinloch, Adhesion and Adhesives Science and Technology, Chapman and Hall, London, 1987)...

Joint design - general C WATSON Flat and cylindrical joints good and bad practice... 

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