AN IMPROVED AQUEOUS PROCESS FOR ZIRCONIUM ALLOY NUCLEAR REACTOR FUELS. PART II. CONTINUOUS DISSOLUTION WITH 5M HYDROFLUORIC ACID

1963 ◽  
Author(s):  
B. J. Newby
Keyword(s):  
Hydrofluoric Acid ◽  
Zirconium Alloy ◽  
Nuclear Reactor

Determination of the Hydrogen Concentration in Zr-2.5Nb Alloy by a Resonant Ultrasound Spectroscopy

2006 ◽  
Vol 321-323 ◽  
pp. 1576-1579
Author(s):  
Yong Moo Cheong ◽  
Young Suk Kim
Keyword(s):  
Hydrogen Concentration ◽  
Zirconium Alloy ◽  
Nuclear Reactor ◽  
Zirconium Alloys ◽  
Resonant Ultrasound Spectroscopy ◽  
Heavy Water Reactor ◽  
Resonant Ultrasound ◽  
Non Destructive

Zirconium alloys are used for many applications in nuclear components, such as the pressure tube material in a pressurized heavy water reactor, nuclear fuel cladding, etc. One of the problems during the operation of a nuclear reactor is the degradation of the zirconium alloys, which is due to an increase of the hydrogen content in the zirconium alloy. Therefore a non-destructive determination of the hydrogen concentration in zirconium alloy is one of the important issues that need to be addressed. The resonant ultrasound spectroscopy (RUS) technique is evaluated for a characterization of the hydrogen concentration in Zr-2.5Nb alloy. Referring to the terminal solid solubility for dissolution (TSSD) of Zr-2.5Nb alloy, the plot of the mechanical damping coefficient (Q-1) versus the temperature or the deviation of the resonant frequency for the temperature (df/dT) versus the temperature was correlated for the hydrogen concentration in Zr-2.5Nb alloy. It was found that the temperature at an abrupt change of the slope can be correlated with the hydrogen concentration of the Zr-2.5Nb alloy.

Modifications of Titanium and Zirconium Alloy Surfaces for Use as Dental Implants

2020 ◽  
Vol 1012 ◽  
pp. 477-482
Author(s):  
Daniela Maria Cerqueira Leite ◽  
Maicon Cavalieri de Alencar ◽  
Cristiano Stefano Mucsi ◽  
João Victor Sousa Araujo ◽  
Luiz Alberto Tavarese Pereira ◽  
...  
Keyword(s):  
Dental Implants ◽  
Hydrofluoric Acid ◽  
Zirconium Alloy ◽  
Mechanical Characterization ◽  
Surgical Techniques ◽  
Manufacturing Processes ◽  
Optical Profilometry ◽  
Current State ◽  
Physical Chemical ◽  
State Of Art

The use of dental implants of titanium and its alloys has proved to be effective, through well established and documented parameters, both in the dimensions and in the manufacturing processes and also in the surgical techniques. There are clinical situations where there is a need to reduce the diameter of the implants, below 3.75 mm in diameter. In the current state of art of the implant technology it is desirable that these also have surfaces capable of decreasing the period of osseointegration. In the present work, to improve the mechanical strength of the material, an alloy of 80% of Ti and 20% of Zr % in mass was proposed and elaborated, aiming its use as biomaterial. Physical, chemical, microstructural and mechanical characterization was carried out. The surfaces of the treated samples were observed using: scanning electron microscopy (SEM); semi quantitatively chemically analyzed using dispersive energy spectroscopy (EDS: wettability of the samples was determined and, finally, the roughness was measured using optical profilometry. For the conditions used in the present work, it was concluded, that the best surface treatment for the TiZr 80/20 alloy was acid etching with 1% vol. hydrofluoric acid for 5 minutes, as this treatment presented the most prominent results of wettability and roughness simultaneously.

A study of the zirconium alloy protection by Cr3C2–NiCr coating for nuclear reactor application

2016 ◽  
Vol 287 ◽  
pp. 55-60 ◽  
Author(s):  
Dongliang Jin ◽  
Fan Yang ◽  
Zhonghua Zou ◽  
Lijian Gu ◽  
Xiaofeng Zhao ◽  
...  
Keyword(s):  
Zirconium Alloy ◽  
Nuclear Reactor ◽  
Reactor Application
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