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PROBLEM TO BE SOLVED : To make monolithic, substantially hermetic joining or bonding of two or more aluminum nitride (AlN) ceramic components by promoting transient liquid phase sintering near the contact areas between the components. SOLUTION : In a first approach, AlN particles are combined with a rare earth oxide sintering additive such as yttrium oxide (Y2O3) in a joining paste; the resultant additive is applied between the joining surfaces of fired ceramic preformed components prior to final firing to weld the components together. In a second approach, the additive is added to green mixture, and the components having different shrinkage aspect ratios are mated and cofired in an atmosphere containing a partial pressure of the additive. The additive encourages wetting and diffusion of the liquid phases present on the surfaces of ceramic interface particles in the contact areas during final firing. SELECTED DRAWING : Figure 9 COPYRIGHT : (C)2019, JPO&INPIT