Thermal Spallation
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Effect of blisters and rims on radial hydride precipitation in fuel elements under dry storage conditions
ABSTRACT Hydrogen enters in Zry clads during fuel element life in service; when hydrogen exceeds the terminal solid solubility, circumferential hydrides are precipitated. In the presence of thermal gradients, produced for instance by oxide spallation, localized concentration of hydrides - known as blisters - can be formed. Due to the fact that zirconium hydr
Matéria (Rio J.). Publicado em: 19/07/2018
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2. NUMERICAL STUDY OF THE INTERACTION BETWEEN A SUPERSONIC JET AND PLANAR SURFACE / ESTUDO NUMÉRICO DA INTERAÇÃO ENTRE UM JATO SUPERSÔNICO E UMA SUPERFÍCIE PLANA
I in this work a study of the interaction between a supersonic jet and a planar surface is presented, with the aim to analyze the behavior of the velocity, pressure and temperature flowfield. This study finds its motivation in the process of thermal spallation of hard rocks, which may result from the interaction between a high pressure and high temperature j
Publicado em: 2008
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3. Stress and adhesion of chromia-rich scales on ferritic stainless steels in relation with spallation
The relation between chromia scale spallation during oxidation or cooling down of ferritic stainless steels is generally discussed in terms of mechanical stresses induced by volume changes or differential thermal expansion. In the present paper, growth and thermal stress measurements in scales grown on different ferritic steel grades have shown that the main
Materials Research. Publicado em: 2004-03
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4. Oxidation - Nitridation of Ni-Cr-Al alloys
A series of alloys containing 24-36 wt pct Cr and 13.5 - 25.0 wt pct Al was reacted with air at 1100°C for 260 h. The products of isothermal reaction were scales of a-Al2O3 plus small amounts of Cr2O3. These grew according to parabolic kinetics, interrupted by episodic weight losses caused by partial spallation. No nitridation occurred during the isothermal
Materials Research. Publicado em: 2004-03
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5. Duplex Al-based thermal spray coatings for corrosion protection in high temperature refinery applications
The application of thermal spray coatings has been effective in preventing corrosion of steel and iron products. It has been used in a wide range of applications spreading from the petroleum to the food industry. In this work, the performance and effectiveness of a two-layered aluminum-based thermal spray coating applied to an ASTM A387 G11 steel was evaluat
Materials Research. Publicado em: 2004-03
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6. Effects of isothermal treatment on microstructure and scratch test behavior of plasma sprayed zirconia coatings
The increase of the petroleum cost in the last decades revitalized the interest for lighter and more economic vehicles. Simultaneously, the demand for safe and unpolluted transports grows. The application of thermal barriers coatings (TBC) on combustion chamber and on flat surface of pistons reduces the thermal losses of the engines, resulting in higher temp
Materials Research. Publicado em: 2004-03
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7. Rock drilling using hot supersonic jet / Perfuração de rochas por jato supersônico quente
This work discusses the possibility of applying the thermal spallation technique i.e., the use of hot supersonic jets for drilling and tunneling processes, on certain rocks of interest of the oil drilling industry. This technique was successfully used on granite rocks achieving high penetration rates (1 to 10 m/hr) compared to conventional techniques. An exp
Publicado em: 2004
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8. Perfuração de rochas por jato supersônico quente / Rock drilling using hot supersonic jet
No presente trabalho é apresentado o estudo da técnica de descamação térmica de rochas com o emprego de jatos supersônicos quentes com vistas à possível utilização na perfuração de poços e na abertura de túneis. Tal técnica já foi utilizada com sucesso, permitindo se obter altas taxas de penetração (1 a 10 m/hr) em rochas graníticas, apres
Publicado em: 2004