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Sunday, July 26, 2020 | History

2 edition of design and development of a glass ceramic seal for high pressure pyrotechnic acutators found in the catalog.

design and development of a glass ceramic seal for high pressure pyrotechnic acutators

Clifford P. Ballard

design and development of a glass ceramic seal for high pressure pyrotechnic acutators

by Clifford P. Ballard

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  • 35 Currently reading

Published by Dept. of Energy, Sandia Laboratories, for sale by the National Technical Information Service] in Albuquerque, N. M, [Springfield, Va .
Written in English

    Subjects:
  • Glass-metal sealing.

  • Edition Notes

    StatementClifford P. Ballard, Ceramics Developments Division I - 5845, B. R. Steele, Initating and Pyrotechnic Components Division - 2515, Sandia Laboratories ; prepared by Sandia Laboratories for the United States Department of Energy under Contract AT(29-1)-789.
    SeriesSAND ; 78-2004, SAND (Series) (Albuquerque, N.M.) -- 78-2004.
    ContributionsSteele, B. R., United States. Dept. of Energy., Sandia Laboratories. Ceramics Development Division 5845., Sandia Laboratories. Initiating and Pyrotechnic Components Division 2515.
    The Physical Object
    Pagination64 p. :
    Number of Pages64
    ID Numbers
    Open LibraryOL15235388M

    Recent work on a new glass-ceramic/alloy for pyrotechnic components is discussed. A newly developed family of austenitic stainless steels has been hermetically sealed to a widely used lithia-alumina-silica (LAS) glass-ceramic. These alloys, originally developed for high oxidation resistance, contain wt% Al. alloys which has led to the development of many useful technologies. One of them is Glass-to-metal seal (GTMS) technique. GTMS becomes a popular and low cost method to hermetic sealing, which is an important part of design of many products today. The GTMS is a fusion bonding technique; glass is heated to a molten state and bonds to the metal.

      This type of high temperature seal for the dense ceramic membrane should meet the following five requirements: (1) the “melted” seal should have good wettability with both the membrane and supporting tube; (2) the seal material should have suitable viscosity and rigidity in the temperature range of permeation/reaction experiments to allow the seal to fill and stay in the gap between the. exhibit high tensile and compressive strength and are typically used in wear rings for bearing support and in auxiliary devices for extrusion resistance. For typical physical properties, see Table on page Engineered Resins — Nylons W — MolyGard® GraY Heat stabilized, internally lubed, 30% glass .

    A pyrotechnic actuator has been developed utilizing new design concepts and materials. The new design features include a non-oriented connector, an electrostatic shield for safety, an output-end seal to eliminate initial free volume, and a retaining washer to prevent movement of the pyrotechnic during exposure to high G loads and thermal cycling. Glass Not Wetting. Glass not wetting: Too much oxidation on the metal, Metal requires pre-oxidation, Metal not clean,Furnace atmosphere not optimum, Choose a different metal or glass; Low Breakdown Voltage. Low breakdown voltage: Inclusion(s) in the glass, Glass composition has a high dielectric constant, Seal design is not optimum.


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Design and development of a glass ceramic seal for high pressure pyrotechnic acutators by Clifford P. Ballard Download PDF EPUB FB2

Get this from a library. The design and development of a glass ceramic seal for high pressure pyrotechnic actuators. [Clifford P Ballard; B R Steele; United States.

Department of Energy.; Sandia Laboratories. Ceramics Development Division ; Sandia Laboratories. Initiating and Pyrotechnic Components Division ]. The white opaque "glue" between the panel and the funnel of a colour TV cathode ray tube is a devitrified solder glass based on the system PbO-ZnO-B 2 O 3.

While this is a glass-ceramic-to-glass seal, the basic patent of S.A. Claypoole considers glass-ceramic-to-metal seals. Abstract. Thermal mechanical stresses of glass-ceramic to stainless steel (GCtSS) seals are analyzed using finite element modeling over a temperature cycle from a set temperature (T set) °C to °C, and then back to ° are two glass-ceramics that have an identical coefficient of thermal expansion (CTE) at ~16 ppm/°C but have very different linearity of thermal strains.

Request PDF | Design and Fabrication of Super‐High Strength Glass‐Ceramic to Metal Seals | Super-high strength glass-metal electrical components able to withstand hydrostatic pressures in.

Glass ceramics in the MgO–Al 2 O 3 –SiO 2 system found one of the earliest applications for a glass ceramic as a radome or missile nose cone.

This non-alkali glass ceramic combines high electrical resistivity (see Table 4.) with high mechanical strength (see Table 3.) and moderately low thermal expansion (see Table 2). Glass-ceramic-to-metal seals have been fabricated with various silicate, phosphate and borate based oxide glasses depending upon the intended application.

In this article, we review our studies on various glass and glass-ceramics materials development with a view to understand bonding behaviour with metals/alloys at ambient. PyroCeram Glass. PyroCeram is a heat-resistant glass-ceramic that can tolerate exceptionally high temperatures.

In actuality, it is a transparent version of ceramic. PyroCeram was first implemented to create casserole dishes and saucepans. However, sealing operations at low pressure, particularly for glass prepared under ambient pressure, can be delicate owing to extensive bubbling in the glass.

The chemical bonding theory shows that it is not only the nature of the interface but the sealing conditions that play a dominant role in the integrity of glass-to-metal and glass-ceramic.

The design of these components, which combines high tensile strength superalloys with a multi-component lithia-alumina-silica glass-ceramic, is of critical importance in obtaining these super-high.

Pilkington Glass (see IStructE, Structural Use of glass in buildings, ) 5. “Technical Code for Glass Curtain Wall Engineering”, JGJ, Beijing, China NOTE: • For % probability of failure in annealed glass, a design factor of is used against the averaged stress.

For % of failure, the design factor is 5. Therefore, the close-off pressure for three-way valves is simply the design differential pressure across the coil/valve assembly. For two-way valve systems, the differential pressure will be at least as high as the design differential pressure across the assembly, but it can be much higher depending on how the pump is controlled.

Only Kryoflex Ceramic-to-Metal Seals are Hermetic Now And Forever. Kryoflex polycrystalline ceramic — a multiple-phase derivative of ceramic oxide crystalline silicates— was developed by PA&E as a direct ceramic-to-metal replacement for conventional compression glass.

@article{osti_, title = {High strength glass-ceramic to metal seals}, author = {Haws, L D and Kramer, D P and Moddeman, W E and Wooten, G W}, abstractNote = {In many applications, ceramics are joined to other materials, especially metals.

In such cases, interfacial strength is as important as the strength of each constituent material. Heat-resistant glass is commonly consisting of a soda lime or silica that is a heat-resistant material, with a very low expansion coefficient and a high melting point.

Heat resistant glass is a type of glass that is designed to resist thermal shock. This glass is believed to be better than any other ordinary glass. Glass-Ceramic-to-Metal Seals and Coatings p.

Mechanical Property Degradation Induced by Elevated Temperature Environmental Attack in MCrAlY Coatings of Gas Turbine Blades p. Vulcanized Rubber-Based Composite Materials with Temperature/Pressure Sensitivity p.

Index Author Index p. Subject Index p. Pyroglass has been leading the field in high temperature sealing and insulating materials for more than 30 years. Our company was established in and remains an independently owned British manufacturing business with a wealth of experience in the design, production and marketing of specialist thermal materials.

Introduction to Glass Technology 3 • σ= failure stress, i.e. strength of the material • c = flaw size in meters • KIC = Critical stress intensity factor for mode I crack propagation. • KIC has low values for brittle materials, high values for tough materials • Value = - MPa-m for glass Practical Strength of Glass.

The design and development of sliding seals, of high strength headers for pyrotechnic-driven actuators. These techniques have been applied to three aspects of the design process of a high. In general, the voids inside the glass joints need to be reduced to further increase the reliability of the ceramic/glass/ceramic systems.

In this case, a little pressure is recommended to be applied onto the joints during bonding. This might squeeze out some of the voids from the glass melts at high temperature.

Pyrotechnic actuators use hollow cylindrical ceramic or plastic charge holders to electrically isolate the pyrotechnic charge from the actuator case. In a newly developed actuator, 30% glass fiber filled polyetheretherketone (PEEK) was selected as the charge holder material both for its strength and its forming properties.

insulating material, usually a ceramic, glass, or glass-ceramic) to the bridgewire. The energy transferred via the bridgewire is used to ignite the energetic material. In order for the component to function successfully, the selected insulating material must form a high-quality seal with the pin(s) and with the shell [].

In.The actuators have also been successfully fired at F and + F and produce psig into a 10 cc pressure vessel. Included are the results of the development tests as well as the design features of the actuator.

Technical Papers of Dr. Barry T. Neyer. INTRODUCTION. Laser initiated ordnance has been a technology under development for 20 years.a multiple pin G/M seal design was found to experience large accumulations of principal stress and deformation during pressure loading of the interior face.

High speed video data discovered the G/M seal failed along the glass-to-pin interface during shock overload failure. Overall, this thesis provided definition of failure.