Search Results

Advanced search parameters have been applied.
open access

D0 Silicon Upgrade: VLPC Prototype Cryostat Custom J1 VME Backplane Specification

Description: The general physical layout is: (1) There are a total of 9 slots, designated 1 through 9, from left to right; (2) Each slot is associated with a 96 pin Class 2 DIN 41612 (VME type) connector; (3) All even numbered slots are right handed (Connectors to the right of the card)., as would be found on a normal VME J1 backplane, these slots utilize standard DIN connectors; (4) All odd numbered slots are left handed. These slots utilize standard 96 pin Class 2 DIN 41612 connectors orientated with 180 … more
Date: September 16, 1996
Creator: Baert, Mark
Partner: UNT Libraries Government Documents Department
open access

Creep performance of candidate SiC and Si{sub 3}N{sub 4} materials for land-based, gas turbine engine components

Description: Tensile creep-rupture of a commercial gas pressure sintered Si3N4 and a sintered SiC is examined at 1038, 1150, and 1350 C. These 2 ceramics are candidates for nozzles and combustor tiles that are to be retrofitted in land-based gas turbine engines, and there is interest in their high temperature performance over service times {ge} 10,000 h (14 months). For this long lifetime, a static tensile stress of 300 MPa at 1038/1150 C and 125 Mpa at 1350 C cannot be exceeded for Si3N4; for SiC, the corr… more
Date: March 1, 1996
Creator: Wereszczak, Andrew A. & Kirkland, Timothy P.
Partner: UNT Libraries Government Documents Department
open access

Development of sol-gel derived coating for NICALON{sup TM}/SiC composites

Description: Mullite and aluminum titanate precursor polymeric sols were developed for applying as coatings on Nicalon{trademark} fabrics and tows. A Nicalon{trademark}/SiC composite with a mullite interface was fabricated. The mullite precursor interface coatings were applied by a vacuum infiltration method and the SiC matrix was deposited by a forced flow chemical vapor infiltration process. Thin, uniform mullite interface coatings were obtained. However, the Nicalon{trademark}/SiC composite exhibited bri… more
Date: May 1, 1996
Creator: Shanmugham, S.; Liaw, P. K.; Stinton, D. P.; Besmann, T. M.; More, K. L.; Bleier, A. et al.
Partner: UNT Libraries Government Documents Department
open access

Development of a Personal Style

Description: With this project I explored pottery forms of Bernard Leach and his apprentices. By exploring this work, it was my intention to expand my forms and address the following questions: 1. What Leach pottery forms were most compatible with my work methods and decoration? 2. What significant changes could I make to these Leach forms to adapt them to my own style of working character? 3. Would producing these adapted forms in two different clay bodies and using different methods to reflect landscape i… more
Date: December 1996
Creator: McKee, Joe Frank S.
Partner: UNT Libraries
open access

Measurement of Gas Transport Properties for Chemical Vapor Infiltration

Description: In the chemical vapor infiltration (CVI) process for fabricating ceramic matrix composites (CMCs), transport of gas phase reactant into the fiber preform is a critical step. The transport can be driven by pressure or by concentration. This report describes methods for measuring this for CVI preforms and partially infiltrated composites. Results are presented for Nicalon fiber cloth layup preforms and composites, Nextel fiber braid preforms and composites, and a Nicalon fiber 3-D weave composite… more
Date: December 1, 1996
Creator: Starr, T. L. & Hablutzel, N.
Partner: UNT Libraries Government Documents Department
open access

Dense ceramic membranes for methane conversion

Description: This report focuses on a mechanism for oxygen transport through mixed- oxide conductors as used in dense ceramic membrane reactors for the partial oxidation of methane to syngas (CO and H{sub 2}). The in-situ separation of O{sub 2} from air by the membrane reactor saves the costly cryogenic separation step that is required in conventional syngas production. The mixed oxide of choice is SrCo{sub 0.5}FeO{sub x}, which exhibits high oxygen permeability and has been shown in previous studies to pos… more
Date: May 1, 1996
Creator: Balachandran, U.; Mieville, R. L.; Ma, B. & Udovich, C. A.
Partner: UNT Libraries Government Documents Department
open access

Fiber-matrix interfaces in ceramic composites

Description: The mechanical properties of ceramic matrix composites (CMCs) are governed by the relationships between the matrix, the interface material, and the fibers. In non-oxide matrix systems compliant pyrolytic carbon and BN have been demonstrated to be effective interface materials, allowing for absorption of mismatch stresses between fiber and matrix and offering a poorly bonded interface for crack deflection. The resulting materials have demonstrated remarkable strain/damage tolerance together with… more
Date: December 31, 1996
Creator: Besmann, T. M.; Stinton, D. P.; Kupp, E. R.; Shanmugham, S. & Liaw, P. K.
Partner: UNT Libraries Government Documents Department

Jupiter's Goalee

Description: The white bowl shape is covered with patterned squares filled in with black and blue short hash marks. A sweeping blue transparent overlay shape hugs the side of the bowl as do two horizontally oriented black outlines.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design

Life on the Moon

Description: The porcelain artwork consists of a cup shape seated on a base. The cup is covered with yellow, gray and black geometric decoration. The yellow sections are textured with linear striations while the gray areas include some squiggly marks that resemble cursive handwriting.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design

Arjuna's Bell

Description: Half of the bowl is decorated in yellow while the other half consists of many closely spaced dark blue rectangular hash marks. On the yellow half of the bowl are many hieroglyphic type marks.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design

Ptolemy's Atlas

Description: The vessel is a tall bowl shape covered with a grooved texture over which are some vertical light blue rectangles that pierce a light purple circle that is textured with curvy lines.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design

Edo Brocade

Description: The bowl shaped vessel sits atop a matching cushion shaped stand. Both bowl and stand are highly textured with grooved lines as well as amoeba shapes within which curved lines are carved. The colors are pale yellow, pale pink and a dark blue black.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design

Song Sung Blue

Description: The bowl shape sits atop a cushion shape that echoes the surface colors and textures of the bowl. A circle shape enclosing wiggly lines decorates the center of the exterior side of the bowl. Also around the exterior of the bowl are vertically oriented linear black lines and textural lines.
Date: 1996
Creator: Milnes, Robert
Partner: UNT College of Visual Arts + Design
open access

Advanced thermal barrier coating system development. Technical progress report, April 1, 1996--May 31, 1996

Description: Objectives of this program are to provide an improved thermal barrier system with increased temperature capability and reliability relative to current systems. This report describes the bond coat development and deposition, manufacturing, and repair.
Date: June 10, 1996
Partner: UNT Libraries Government Documents Department
open access

Salt-occluded zeolite waste forms: Crystal structures and transformability

Description: Neutron diffraction studies of salt-occluded zeolite and zeolite/glass composite samples, simulating nuclear waste forms loaded with fission products, have revealed complex structures, with cations assuming the dual roles of charge compensation and occlusion (cluster formation). These clusters roughly fill the 6--8 {angstrom} diameter pores of the zeolites. Samples are prepared by equilibrating zeolite-A with complex molten Li, K, Cs, Sr, Ba, Y chloride salts, with compositions representative o… more
Date: December 31, 1996
Creator: Richardson, J. W. Jr.
Partner: UNT Libraries Government Documents Department
open access

Computational brittle fracture using smooth particle hydrodynamics

Description: We are developing statistically based, brittle-fracture models and are implementing them into hydrocodes that can be used for designing systems with components of ceramics, glass, and/or other brittle materials. Because of the advantages it has simulating fracture, we are working primarily with the smooth particle hydrodynamics code SPBM. We describe a new brittle fracture model that we have implemented into SPBM. To illustrate the code`s current capability, we have simulated a number of experi… more
Date: October 1, 1996
Creator: Mandell, D. A.; Wingate, C. A. & Schwalbe, L. A.
Partner: UNT Libraries Government Documents Department
open access

Ceramic stabilization of hazardous wastes: a high performance room temperature process

Description: ANL has developed a room-temperature process for converting hazardous materials to a ceramic structure. It is similar to vitrification but is achieved at low cost, similar to conventional cement stabilization. The waste constituents are both chemically stabilized and physically encapsulated, producing very low leaching levels and the potential for delisting. The process, which is pH-insensitive, is ideal for inorganic sludges and liquids, as well as mixed chemical-radioactive wastes, but can al… more
Date: October 1, 1996
Creator: Maloney, M.D.
Partner: UNT Libraries Government Documents Department
open access

Status of the database for solid breeder materials

Description: The databases for solid breeder ceramics (Li{sub 2}O, Li{sub 4}SiO{sub 4}, Li{sub 2}ZrO{sub 3} and LiAl0{sub 2}) and beryllium multiplier material were critically reviewed and evaluated as part of the ITER/CDA design effort (1988-1990). The results have been documented in a detailed technical report which includes progress made in expanding the solid breeder and beryllium databases up through September 1993. Emphasis was placed on the physical, thermal, mechanical, chemical-stability/compatibil… more
Date: December 31, 1996
Partner: UNT Libraries Government Documents Department
open access

Design specifications for manufacturability of MCM-C multichip modules

Description: A comprehensive guide for ceramic-based multichip modules (MCMS) has been developed by AlliedSignal Federal Manufacturing & Technologies (FM&T) to provide manufacturability information for its customers about how MCM designs can be affected by existing process and equipment capabilities. This guide extends beyond a listing of design rules by providing information about design layout, low- temperature cofired ceramic (LTCC) substrate fabrication, MCM assembly and electrical testing Electrical me… more
Date: October 1, 1996
Creator: Blazek, R.; Desch, J.; Kautz, D. & Morgenstern, H.
Partner: UNT Libraries Government Documents Department
open access

Synthesis of organosilicon compounds

Description: Silicon-containing polymers have been a focus of synthesis and study in Dr. Barton`s group because of their chemistry and properties which are not offered by other systems or materials. For example, the polymer -[-SiMe{sub 2}C{triple_bond}C-]{sub n}-can be easily processed to films or fibers from melt or solution, and thermally converted to a SiC-containing ceramic in high yield at high temperature. In recent years, carbosilane dendritic polymers have been of great interests in many research gr… more
Date: December 31, 1996
Creator: Zhao, G.
Partner: UNT Libraries Government Documents Department
open access

3D Oxide/Oxide Composite Filter

Description: Hot gas particulate filters are key components for the successful commercialization of advanced coal-based power-generation systems such as Pressurized Fluidized-bed Combustion (PFBC), including second- generation PFBC, and Integrated Gasification Combined Cycles (IGCC). Current generation monolithic ceramic filters are subject to catastrophic failure because they have very low resistance to crack propagation. To overcome this problem, a damage -tolerant ceramic filter element is needed. Westin… more
Date: December 1996
Creator: Lane, J. E.; LeCostaouec, J.; Painter, C. J.; Su, Wei-Fang A. & Radford, K. C.
Partner: UNT Libraries Government Documents Department
open access

Subcritical Crack Growth in Ceramic Composites at High Temperature Measured Using Digital Image Correlation

Description: An in situ experimental technique is described that allows high resolution, high sensitivity determination of displacements and full-field strains during high temperature mechanical testing. The technique is used to investigate elevated temperature crack growth in SiC/Nicalon sub f composites. At 1150 degrees C, the reinforcing fibers have a higher creep susceptibility than the matrix. Fiber creep leads to relaxation of crack bridging tractions, resulting in subcritical crack growth. Differenti… more
Date: January 11, 1996
Creator: Mumm, D. R.; Morris, W. L.; Dadkhah, M. S. & Cox, B. N.
Partner: UNT Libraries Government Documents Department
open access

Properties of Ceramic Filters

Description: The mechanical integrity of ceramic filter elements is a key issue for hot gas cleanup systems. To meet the demands of advanced power systems, the filter components sustain thermal stresses of normal operations (pulse cleaning), of start-up and shut-down, and of process upsets such as excessive ash accumulation without catastrophic failure. They must also survive various mechanical loads associated with handling and assembly, normal operation, and process upsets. For near-term filter systems, t… more
Date: December 31, 1996
Creator: Spain, J.D.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen