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Search Publications by: Andrew Slifka ()

Displaying 126 - 150 of 150

Thermal Conductivity Measurement of an Electron-Beam Physical Vapor-Deposition-Coating

April 1, 2003

Author(s)

Andrew J. Slifka, Bernard J. Filla

An industrial thermal-barrier coating designated PWA 266, processed by electron-beam physical-vapor deposition, was measured using a steady-state thermal conductivity technique. The thermal conductivity of the 7%, by mass, yttria-stabilized zirconia

Thermal Evaluation of Scorched Graphite-Epoxy Panels by Infrared Scanning

March 1, 2003

Author(s)

Andrew J. Slifka, T Hall, E S. Boltz

A simple measurement system is described for evaluating damage to graphite-dpoxy panels, such as are used in high-performance aircraft. The system uses a heating laser and infrared imaging system to measure thermal performance. thermal conductivity or

Apparent Mobility of Interfaces in Integral Resistor Material

January 1, 2003

Author(s)

Andrew J. Slifka, John W. Drexler

Measurements were made on an integral resistor sample that showed apparent interfacial mobility. Initial measurements were made using infrared, optical, and scanning electron microscopies. Analysis of infrared microscopy measurements showed a broadening of

Thermomechanical Effects in Embedded Passive Materials

April 1, 2002

Author(s)

Andrew J. Slifka, Elizabeth S. Drexler

Thermomechanical fatigue was measured using electron-beam moire (EBM) and infrared (IR) microscopy. A specimen was made using FR-4 printed wiring board, (PWB), a silver-filled conductive adhesive, and a carbon-filled conductive paste. Both filled polymeric

Characterization of Interfaces Involving Electrically Conductive Adhesives Using Electron-Beam Moire and Infrared Microscopy

March 1, 2002

Author(s)

Andrew J. Slifka, Elizabeth S. Drexler

The complimentary techniques of electron-beam moire and infrared microscopy were used to determine the mechanical and thermal degradation of interfaces involving electrically conductive adhesives. The infrared microscopy technique was used to examine the

Low Thermal Conductivity Vapor Deposited Zirconia Microstructures

April 1, 2001

Author(s)

D D. Hass, Andrew Slifka, H N. Wadley

Low thermal conductivity yttria stabilized zirconia (YSZ) coatings have been grown using a low vacuum (0.20 Torr) electron beam directed vapor deposition process. In this approach, a transsonic helium jet was used to entrain and transport an evaporated YSZ

Thermal-Conductivity Apparatus for Steady-State, Comparative Measurement of Ceramic Coatings

August 1, 2000

Author(s)

Andrew J. Slifka

An apparatus has been developed to measure the thermal conductivity of ceramic coatings. Since the method uses an infrared microscope for temperature measurement, coatings as thin as 20 m can, in principle, be measured using this technique. This steady

Thermal-Conductivity Apparatus for Steady-State, Comparative Measurement of Ceramic Coatings

August 1, 2000

Author(s)

Andrew J. Slifka

An apparatus has been developed to measure the thermal conductivity of thermal barrier coatings. Since the method uses an infrared microscope for temperature measurement, coatings as thin as 20 υm can, in principle, be measured using this technique. The

The Effect of Thermal Shock on the Thermal Conductivity of a Functionally Graded Material

October 1, 1999

Author(s)

Andrew J. Slifka, M Packer, A Kumakawa, Bernard J. Filla, J M. Phelps, N Shimoda

We have measured the thermal conductivity of a ni20Cr / 8% yttria-partially-stabilized-zirconia functionally graded 1.1 mm thick coating on a substrate of 403 stainless steel. We measured thermal conductivity of the as-received coated specimen, then

Thermal Conductivity of Two Compositions of Yttria-Stabilized Zirconia

June 1, 1999

Author(s)

Andrew J. Slifka, Bernard J. Filla, Judith K. Stalick

The thermal conductivities of two different compositions of yttria-stabilized zirconia have been measured using an absolute, steady-state method. The measurements were made in a one-dised guarded-hot-plate apparatus from 130 C to 950 C. one material has a

Thermal Conductivity of Magnesium Oxide From Absolute, Steady-State Measurements

July 1, 1998

Author(s)

Andrew J. Slifka, Bernard J. Filla, J M. Phelps

Thermal Conductivity Measurements of Pyroceram 9606 Using a High-Temperature Guarded-Hot-Plate

October 1, 1997

Author(s)

James Filla, Andrew Slifka

The thermal conductivity of Pyroceram 9606 has been measured using a steady-state high-temperature guarded-hot-plate over a temperature range of 130 C to 800 C.

A Tribometer for Measurements in Hostile Environments

June 1, 1993

Author(s)

Andrew Slifka, J Chaudhuri, R Compos, James D. Siegwarth

A tribometer at the National Institute of Standards and Technology in Boulder, Colorado is used to measure the coefficient of friction and the wear rate for various specimens in a controlled atmosphere of oxygen or non-corrosive gas. The wide range of