METAL-TO-CERAMIC SEAL TECHNOLOGY STUDY. Final Technical Report, June 22, 1959 to September 22, 1960
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Published: 1960
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Published: 1960
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Published: 1960
Total Pages: 105
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Published: 1962
Total Pages: 1500
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DOWNLOAD EBOOKAuthor: United States. Department of the Interior. Library
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Published: 1967
Total Pages: 788
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DOWNLOAD EBOOKAuthor: United States. Department of Commerce. Office of Technical Services
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Published: 1962
Total Pages: 522
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Published: 1962
Total Pages: 748
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DOWNLOAD EBOOKAuthor: S. S COLE (JR.)
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Published: 1960
Total Pages: 127
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DOWNLOAD EBOOKA literature survey on ceramic-to-metal sealing techniques, adherence theory, and allied systems disclosed limited published work and no procedures for achieving ultra-high-strength seals or seals to pure high alumina. Two additional theories were formulated for this study--one proposing the migration of the glass in the ceramic (over) into the metallizing mixture, and the other recognizing the need for promoting metallized sintering. Three sintering temperatures were chosen, depending on composition, for each of the 200 metallizing mixtures. Each mixture was applied to specimens of 94-, 96-, and 99.6-percent alumina. Testing involved a screening technique whereby the most promising compositions were carried through to increasingly refined test techniques (scratch and peel, circumferential seal, and finally tensiles tests). The tensile test specimen was redesigned to eliminate shoulder breaks when evaluating ultra-high-strength seals. Extremely strong seals were developed for all the ceramic bodies considered. A wide variety of sealing compositions was disclosed which produced seals stronger than those previously reported. A method to calculate stresses in ceramic-to-metal seals is theorized. Measurements of the properties of the metal and of residual stresses in seals were made, showing excellent agreement with calculated stresses.
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Published: 1963
Total Pages: 0
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DOWNLOAD EBOOKAuthor: U.S. Atomic Energy Commission
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Published: 1968
Total Pages: 260
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DOWNLOAD EBOOKAuthor: GORDON H. JR. KLINESTIVER
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Published: 1959
Total Pages: 1
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DOWNLOAD EBOOKPilot line production work on ceramic envelope, Type SN-2358C, was preceded by a design evaluation of the identical structure sealed in a glass envelope. Ceramic to metal active alloy sealing was investigated because of the apparently inherent ability of the NiTi seal to form microscopic cracks; a workable solution was obtained. Exhaust and processing techniques were improved by design of a resistance heating system capable of processing and sealing several tubes simultaneously. Environmental testing and evaluation of Type SN-2358C indicated that the design is capable of surviving 400 C temperatures for extended periods. Improvements in structure resulted in a tube which was approaching 100% yield after 750G shock tests. Sweep frequency vibration fatigue tests resulted in early failure of the tubes in most cases. Evaluation of Type SN-2358C in a severe dc amplifier application indicated that the tube should compete with many existing premium glass triodes. (Author).