Sealed Parts Research Articles

Helium Source-Rock in Southwestern Saskatchewan

ABSTRACT Helium-enriched natural gas occurs in Upper Cambrian silicified siltstones and mudstones overlying a pronounced basement topographic high (the Aikens anomaly) nine miles north of Swift Current, Saskatchewan. Relief of 600 ft, relative to the regional basement elevation, can be attributed to the massive structure and stability to weathering of the undeformed and unmetamorphosed porphyritic rhyolite forming the topographic anomaly. Delayed neutron-activation analysis of a rhyolite core sample from B. A. Wilhelm 1-9 indicates 4.9 ppm. U, only slightly above the western Canada basement average of 4.3 ppm. U. However, core samples from M.O.W.S. Cantuar 2-21 and M.O.W.S. Fosterton 15.3, 20 and 25 mi to the west respectively, contain 24.1 and 15.7 ppm. U. Compositionally both rocks are porphyritic granites. Textural features suggest epizonal emplacement. The suggested origin of the helium accumulation is: A Late Hudsonian volcanic-plutonic centre developed west of the present site of Swift Current. Pre - Upper Cambrian erosion formed a series of hills above this complex. Upper Cambrian transgression (Deadwood Formation) buried the hills. Authigenic silica tightly sealed parts of the siltstone and mudstone overlying the Aikens anomaly. Circulating formation fluids carried helium from the subcrop of uranium-rich porphyritic granites along the Precambrian-Cambrian unconformity to the highest adjacent topographic feature.

New materials for slit seal parts in feedwater pumps

New materials for slit seal parts in feedwater pumps

Survey of the theory of mechanical face seals—part III. Dynamic and interfacial fluid effects : L. H. Bernd, Lubrication Eng., 24 (12) (1968) 597–604; 1 fig., 3 tables, 62 refs

Survey of the theory of mechanical face seals—part III. Dynamic and interfacial fluid effects : L. H. Bernd, Lubrication Eng., 24 (12) (1968) 597–604; 1 fig., 3 tables, 62 refs

Translucent Aluminum Oxide-to-Titanium Sealing by Reactive Alloying Method

Translucent aluminum oxide, a crystalline substance, has transmittivity of some 90%, high corrosion resistance, and high stability in alkali metal vapor at high temperature and pressure, in addition to the high mechanical strength and thermal resistance which are the specific properties of conventional alumina ceramic.By this new substance being utilized for a discharge tube and the sodium vapor pressure being increased, a sodium-vapor lamp has been developed, which is smaller than conventional and produces white light with a wide spectral band and the luminous efficiency of about 100 lm/W.This new substance-to-metal sealing is very difficult. The writers sealed this new substance to Ti by reactive alloying method utilizing Ti-Ni. Particularly, paying, attention, to sealing time and the surface condition of this new substance in sealing, we investigated those influences on seal strength and the vacuum tightness, and observed and examined the sealed part by the microscope and the X-ray microanalyzer.Gained results are as follows.(1) By reactivealloying method utilizing Ti-Ni, it is possible to seal in vacuum-tight this new substance to Ti.(2) Sealing surface which is flat and slightly rough, is good to obtain the vacuum tightness.(3) At sealing temperature of 1000°C, seal strength approaches the saturation condition in 10 minutes to seal, and the seal strength is about 150 kg/cm2.(4) In the sealed part, the triangular and the lustrous crystal constructions are observed, these parts seem to be Ti2Ni phase.(5) In the sealing part of this new substance to Ti, three boundary layers are observed. Ti, Ni and Al elements show their own peculiar diffusion distribution in these layers. In this part, a solid solution or a compound of Ti-Al-Ni-O system and Ti-Al-O system is formed, and the combination between this new substance and Ti seems to be completed.

Analysis of random failures

The term “random failure” has been used much in recent literature to justify those few failures of electronic parts which could not readily be explained. The goal seems to have been the elimination of causes of failures until only random failures remain. The inference is that nothing can be done about these. It is the purpose of this paper to show how analysis of random failures has been used in product improvement at Remington Rand Univac. Described are some of the techniques employed in the analysis of computer sealed chassis and component part failures. The paper also points out that these same techniques can be used in evaluating components proposed for use in reliable equipment where insufficient time is available to conduct life evaluations.

硝子封着用ニッケル

Glass nickel sealing in spite of the relatively large difference in expansion coefficient between them is made possible by the process of producing a bubble layer around the nickel wire, which minimizes the strains in the glass and protects the sealed part from cracking. In this experiment two important properties of rickel for glass sealing were examined: Namely, the character of producing bubbles and the wettability of glass to nickel were investigated by measuring the bubble size produced on the sealed part and the contact area of glass spread on the nickel plate in heating at various temperatures. The results obtained are as follows: (1) The wettability of glass to nickel depends on the surface condition of the metal. The mechanically polished specimen was very wettable. (2) In the specimens with several alloying elements added, manganese-added alloy was very wettable, while silicon-added specimen, was hard to be wetted. In the other specimens containing aluminum, chromium and magnesium, no effect of additions on the wettability of glass was observed. (3) The capacity of producing a good bubble layer depends on the melting condition of nickel. The specimen incompletely deoxidized and degassed showed good result, while the fully treated specimens produced no bubble at the part of sealing. (4) The gassy nickel containing relatively much carbon and incompletely degassed in molten state showed remarkable hardening (Hv about 300) by low temperature annealing and good resistance to atmospheric oxidation in heating at 700∼900°C temperature range.

Glass Floats off the Isle of Lewis

IT would be of great importance if the fact could be ascertained whether the floats are from the Norwegian or from the Canadian fisheries. Your note of November 10 says, “They are hermetically sealed, and have certain characters, such as IV. or VI., impressed on the sealed part.” Doubtless your columns are read in Norway as well as in Canada, and possibly a correspondent, from these characters or from other evidence, may claim the floats for one or for the other side of the Atlantic. In favour of the west side, but with the utmost deference to the opinion of Mr. Gwyn Jeffreys, I suggest that a north-east wind is an unlikely conveyance to “the west side of the Island of Lewis,” or to “the western coast of Shetland.”