Factors Affecting the Extensional Flow of Crowded Suspensions for the Manufacture of thin Wall Ceramic Bodies

1992 ◽  
Vol 289 ◽  
Author(s):  
James Greener ◽  
Julian R.G. Evans
Keyword(s):  
Extensional Flow ◽  
Thin Wall ◽  
Flow Measurements ◽  
Factors Affecting ◽  
Particulate Suspensions ◽  
Vacuum Forming ◽  
Ceramic Components ◽  
Plastic Forming ◽  
Wall Ceramic ◽  
Ceramic Suspensions

AbstractProcedures for the manufacture of thin wall ceramic components from particulate suspensions using plastic forming methods which employ extensional flows are described. These include vacuum forming, blow moulding and film blowing. In order to understand how to select materials and to adjust the composition of such suspensions, the factors which control suspension rheology are identified. The measurement of extensional viscosity of ceramic suspensions is reported and compared with shear flow measurements.

Influence of Powder Distribution on the Al2O3 Thin-wall Ceramic Formed by Laser Engineered Net Shaping

2015 ◽  
Vol 42 (1) ◽  
pp. 0103006 ◽  
Author(s):  
马广义 Ma Guangyi ◽  
王江田 Wang Jiangtian ◽  
牛方勇 Niu Fangyong ◽  
孙贝 Sun Bei ◽  
吴东江 Wu Dongjiang
Keyword(s):  
Thin Wall ◽  
Laser Engineered Net Shaping ◽  
Wall Ceramic ◽  
Net Shaping

The influence of monomer and polymer properties on the removal of organic vehicle from ceramic and metal moldings

1995 ◽  
Vol 10 (8) ◽  
pp. 2060-2072 ◽  
Author(s):  
S.A. Matar ◽  
J.R.G. Evans ◽  
M.J. Edirisinghe ◽  
E.H. Twizell
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Degradation Products ◽  
Diffusion Constant ◽  
Enthalpy Of Vaporization ◽  
Organic Vehicle ◽  
Polymer Properties ◽  
Plastic Forming ◽  
Successful Removal ◽  
Ceramic Suspensions

This paper describes the effects of monomer and polymer properties on the competition between degradation of organic vehicle and transport of degradation products in ceramic moldings during pyrolysis. An experimentally tested model is studied systematically for ranges of material and process parameters characteristic of known polymers and their degradation products. The work highlights the properties having the greatest influence on the successful removal of organic vehicle from molded ceramics. The polymer properties controlling the diffusion constant are linked to the temperature dependence of viscosity of the molten suspension. Enthalpy of vaporization of the organic vehicle and the activation energy for the diffusion coefficient have a commanding influence on the critical heating rate for avoidance of defects. Preliminary guidelines emerge for the design of polymers for plastic forming of ceramic suspensions.

Ink Jet Deposition of Ceramic Suspensions: Modeling and Experiments of Droplet Formation

2000 ◽  
Vol 624 ◽  
Author(s):  
N. Reis ◽  
B. Derby
Keyword(s):  
Driving Voltage ◽  
Concentrated Suspensions ◽  
Cfd Modelling ◽  
Particulate Suspensions ◽  
Ink Jet ◽  
Fluid Properties ◽  
Printing System ◽  
Modeling And Experiments ◽  
Computational Fluid Dynamics Cfd ◽  
Ceramic Suspensions

ABSTRACTWe have successfully printed green ceramic objects from slurries of Al2O3 dispersed in paraffin wax using a commercial ink-jet printer developed for pattern making (Sanders Prototype MM6PRO). Concentrated suspensions are generally more viscous than the fluids normally passed through ink jet heads. This may alter the response of the printing system to its process parameters, e.g. driving voltage and frequency. We have explored the influence of fluid properties on the ink jet behaviour using Computational Fluid Dynamics (CFD) modelling and a parallel experimental study to determine the optimum printing conditions for particulate suspensions.

The Innovative Reinforcement Technology of Thin Wall Ceramic Substrate Having High Coatability

2000 ◽  
Author(s):  
Masakazu Tanaka ◽  
Mamoru Nishimura ◽  
Masakazu Murata ◽  
Keiji Itou
Keyword(s):  
Ceramic Substrate ◽  
Thin Wall ◽  
Wall Ceramic

Ceramic Stationary Gas Turbine Development Program: Eighth Annual Summary

2001 ◽  
Author(s):  
Jeffrey Price ◽  
Oscar Jimenez ◽  
Narendernath Miriyala ◽  
Josh B. Kimmel ◽  
Don R. Leroux ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Output Power ◽  
Thermal Efficiency ◽  
Gas Turbines ◽  
Field Testing ◽  
The United States ◽  
Phase Iii ◽  
Engine Test ◽  
Ceramic Components ◽  
Wall Ceramic

The Ceramic Stationary Gas Turbine (CSGT) program has been performed under the sponsorship of the United States Department of Energy, Office of Industrial Technologies and Office of Power Technologies. The objective of the program was to improve the performance of stationary gas turbines in cogeneration by retrofitting uncooled ceramic components into the hot section of the engine. The replacement of previously cooled metallic hot section components with the uncooled ceramics enables improved thermal efficiency, increased output power, and reduced gas turbine emissions. This review summarizes the latest progress on Phase III of the program, which involves 1) preparation for the final in-house CSGT engine test of ceramic blades, nozzles and CFCC liners, and 2) field testing of the CFCC combustor liners at two cogeneration end user sites. The field testing of CFCC combustor liners is now being performed under the Advanced Materials Program, sponsored by DOE, Office of Power Technologies. The Solar Centaur 50S engine, which operates at a turbine rotor inlet temperature (TRIT) of 1010°C, was selected for the developmental program. The program goals include an increase in the TRIT to 1121°C, accompanied by increases in thermal efficiency and output power. This is to be accomplished by the incorporation of ceramic first stage blades and nozzles, and a “hot wall” ceramic combustor liner. The performance improvements are attributable to the increase in TRIT and the reduction in cooling air requirements for the ceramic parts. The “hot wall” ceramic liners also enable a reduction in gas turbine emissions of NOx and CO. This 1121°C TRIT engine test of the ceramic hot section is planned for the first quarter of 2001. The component design and material selection have been previously definitized for the ceramic blades, nozzles and combustor liners. Each of these ceramic component designs was successfully evaluated in short-term engine tests in the Centaur 50S engine test cell facility at Solar. Environmental barrier coatings for the ceramic components are also being optimized. To date, seven field installations of the CSGT Centaur 50S engine totaling over 30,000 hours of operation have been initiated under the program at two industrial cogeneration sites. This paper briefly discusses the recent developmental efforts for the upcoming 1121°C TRIT engine test, but focuses on the various field demonstrations of CFCC combustor liners.

Ceramic Stationary Gas Turbine Development Program — Seventh Annual Summary

2000 ◽  
Author(s):  
Jeffrey Price ◽  
Oscar Jimenez ◽  
Vijay Parthasarathy ◽  
Narendernath Miriyala ◽  
Don Leroux
Keyword(s):  
Gas Turbine ◽  
Output Power ◽  
Thermal Efficiency ◽  
Gas Turbines ◽  
Field Testing ◽  
The United States ◽  
Phase Iii ◽  
Engine Test ◽  
Ceramic Components ◽  
Wall Ceramic

The Ceramic Stationary Gas Turbine (CSGT) program is being performed under the sponsorship of the United States Department of Energy, Office of Industrial Technologies. The objective of the program is to improve the performance of stationary gas turbines in cogeneration by retrofitting uncooled ceramic components into the hot section of the engine. The replacement of previously cooled metallic hot section components with the uncooled ceramics enables improved thermal efficiency, increased output power, and reduced gas turbine emissions. This review summarizes the progress on Phase III of the program, which involves field testing of the ceramic components at cogeneration end user sites. The Solar Centaur 50S engine, which operates a turbine rotor inlet temperature (TRIT) of 1010°C (1850°F), was selected for the developmental program. The program goals include an increase in the TRIT to 1121°C (2050°F), accompanied by increases in thermal efficiency and output power. This will be accomplished by the incorporation of ceramic first stage blades and nozzles, and a “hot wall” ceramic combustor liner. The performance improvements are attributable to the increase in TRIT and the reduction in cooling air requirements for the ceramic parts. The “hot wall” ceramic liners also enable a reduction in gas turbine emissions of NOx and CO. The component design and material selection have been definitized for the ceramic blades, nozzles and combustor liners. Each of these ceramic component designs was successfully tested in short term engine tests in the Centaur 50S engine test cell facility at Solar. Based on their performance in a 100 hour cyclic in-house engine test, the ceramic components were approved for field testing. Oxidation of the ceramic components in the gas turbine environment dictated the need for environmental barrier coatings, which were optimized under the program. To date, six field installations of the CSGT Centaur 50S engine totaling over 14,000 hours of operation have been initiated under the program at two industrial cogeneration sites. An 8000 hour field demonstration of a low emission ceramic combustion system was initiated in August 1999. This paper briefly discusses the recent developmental efforts for the ceramic components, but focuses on the various field demonstrations.

Thin Wall Ceramic Tubes by Extrusion of Thermoplastic-ZrO2 Compounds

2001 ◽  
Vol 206-213 ◽  
pp. 425-428 ◽  
Author(s):  
Frank J. Clemens ◽  
Thomas Graule
Keyword(s):  
Thin Wall ◽  
Wall Ceramic

Product Design and Development of Ultra Thin Wall Ceramic Catalytic Substrate

2002 ◽  
Author(s):  
Yoichi Aoki ◽  
Yukio Miyairi ◽  
Yukihito Ichikawa ◽  
Fumio Abe
Keyword(s):  
Product Design ◽  
Thin Wall ◽  
Design And Development ◽  
Wall Ceramic
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