Development of Alternative Method for Manufacturing Structural Zirconium Elements for Nuclear Engineering

Zirconium is used as a structural material for use in aggressive environments, including the core of nuclear reactors. The traditional technology of manufacturing the structural elements of zirconium nuclear reactors is characterized by a long technological process and a significant amount of waste in the form of metal shavings. The paper presents the results of an alternative technology, spark plasma sintering, for manufacturing zirconium products. A complex of microstructural and mechanical studies of the obtained samples was carried out according to the ASTMB-351 standard. The sintering of zirconium powder and options for subsequent processing by various methods, including non-standard ones such as radial shear rolling, are justified.

Download Full-text

Spark plasma sintering for high-speed diffusion bonding of the ultrafine-grained near-α Ti–5Al–2V alloy with high strength and corrosion resistance for nuclear engineering

Journal of Materials Science ◽

10.1007/s10853-019-03926-6 ◽

2019 ◽

Vol 54 (24) ◽

pp. 14926-14949 ◽

Cited By ~ 1

Author(s):

Vladimir Nikolaevich Chuvil’deev ◽

Aleksey Vladimirovich Nokhrin ◽

Vladimir Ilyich Kopylov ◽

Maksim Sergeevich Boldin ◽

Mikhail Mikhaylovich Vostokov ◽

...

Keyword(s):

Corrosion Resistance ◽

Spark Plasma Sintering ◽

Diffusion Bonding ◽

High Speed ◽

High Strength ◽

Nuclear Engineering ◽

Plasma Sintering ◽

Ultrafine Grained ◽

Spark Plasma

Download Full-text

Fabrication and Electric Transport in MgB2 Doped with Nanosized Carbon-Based Core-Shell Structures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.871 ◽

2010 ◽

Vol 663-665 ◽

pp. 871-875

Author(s):

Viorel Sandu ◽

Gheorghe Virgil Aldica ◽

Stelian Popa ◽

Elena Cimpoiasu ◽

Florian Dumitrache ◽

...

Keyword(s):

Coherence Length ◽

Shell Structures ◽

Electric Transport ◽

Metallic Core ◽

The Core ◽

Ceramic Samples ◽

Plasma Sintering ◽

Short Processing Time ◽

Spark Plasma ◽

Superconducting Coherence Length

We present the fabrication and electric properties of MgB2 ceramic samples doped with nanosized spheres, 4-8 nm, of graphite with a metallic core. The samples were prepared using the spark plasma sintering technique. The size of the additive is comparable to the superconducting coherence length. The short processing time limits the diffusion of the carbon while keeping the core intact. Therefore, in addition to the doping with carbon, the metallic core, which has the size smaller than the superconducting coherence length, create pinning centers which might improve the dissipationless electric transport. The results are analyzed in the framework of different pinning models.

Download Full-text

Microstructure and Oxidization of Mo Alloys by Spark Plasma Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.936.164 ◽

2018 ◽

Vol 936 ◽

pp. 164-170

Author(s):

Xue Kai Yang ◽

Hong Pang ◽

He Xin Zhang ◽

Qiang Wang ◽

Cheng Zhi Zhao ◽

...

Keyword(s):

Spark Plasma Sintering ◽

Isothermal Oxidation ◽

Argon Atmosphere ◽

Transgranular Fracture ◽

The Core ◽

Plasma Sintering ◽

Structural Applications ◽

Intergranular Brittle Fracture ◽

Spark Plasma ◽

The Right

In the scope of refractory material processed by spark plasma sintering development for structural applications in the core of future combustion chamber, Mo-TiC alloys and Mo-TiC-Cr alloys were sintered at 1700°C with a pressure of 30 MPa. Powders of Mo, TiC and Cr were prepared by planetary ball mill in an argon atmosphere. In this dissertation, the structure, element and phase composition of alloys were investigated. The Mo-TiC alloys showed obvious intergranular brittle fracture. The fracture mode of Mo-TiC-Cr alloys, however, was changed to mixed intergranular and transgranular fracture. The obtained results demonstrated that, compared with the peaks of Mo and Mo2C from Mo-TiC, the peaks of Mo and Mo2C from Mo-TiC-Cr were deflected to the right, due to the addition of chromium forming a solid solution. The results of isothermal oxidation tests at 1200°C in air revealed that the chromium compound on the surface of the oxide layer increases and the pores decreases with the increase of oxidation time for Mo-TiC-Cr alloys. The pores of surface of the Mo-TiC alloys were less and smaller than the Mo-TiC-Cr.

Download Full-text