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The f o m t i c n of a crack-free seal between a 300 series stainless steel an3 a glass-cemnic hzs in the past been very difficult. 'IZle p r L q cause of this difficdty Therefore, the ccrresponding g l a s s d c &mild have a similarly high t o w i l e the formtion of stress-free seals. Both a t E-M;-Mound and a t M;&G Zlect;-cnic ccxipnents, lithia-alumina-silica (m) glass-cadcs have ncw been scccessfully developed and sealed to 304L stainless steel. These mck-free seals have keen routinely fabricated using t m techniques: by adjusting the p r e n t glass carrposition c r by a d j u s t b g t i l e sealhg/qstallazation (or sealkg,/devitrification) cycle tht is r m t i n e l y used in forming seals between LAS glass-ceramic d nickel-&& alloys.seals were determined to be hennetic, w i t h leak rates of < cc/sec of Srp helium.Additional data on rn values and alloy yield strengths will be given which s h w the feasibility of using these materials in the manufacture of various cumponents including Veeco helium mass spectmwter leak tester.was fourid to have a leak rate of coqnnents w e r e helium leak tested; twenty feedthroughs an3 eleven p t e c b i c actuators {see Figure I) All the c a p n e n t s passed the helium leak test.samples were fabricated frcm 304L stainless steel and the effect on their tensfie strength was detemined as a function of the time-tenprature sealing/crystallizatim cycle. cycle of Figure 2 A match w a s also found with the 'baselinel glass that had been sealed b the stainless w i t h the proprietary d i n g / c r y s t a l l i z a t i a n cycle. (7) w e r e found routinely to be crack-free and hexmetic. Figure 2). I n Inanel-718 the strength was found * a increase after the cycle because of formation of the precipitation-hardenbg phase, Ni3Nb.sealing,/crystallization cycle neans that c m p n e n t s m a d e with 304L have the potential of Thus, the fact that the stahless steel iS weakened during the not beas strong as e m p n e n t s made w i t h Inconel 718. Although the stainless cmpnerlts m y not be as strong, this work shows they can be routhely prccfuced, and t h e i r seals c m be made crack-free and hennetic.c m p n e n t s khick do not Thus, 304L would be better suited f o r very h.k& s l z .-->- .3. 4. 5.6 . .a.9. 10.Miamisburg to N e t a l S e a l k g @ l , &caber Resultant after proprietary sealing/crystallization cycle.

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