Structure and property evaluation of a vacuum plasma sprayed nanostructured tungsten–hafnium carbide bulk composite

Abstract

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractVacuum plasma spray (VPS) forming of tungsten-based metal matrix nanocomposites (MMCs) has shown to be a cost effective and time saving method for the formation of bulk monolithic nanostructured thermo-mechanical components. Spray drying of powder feedstock appears to have a significant effect on the improved mechanical properties of the bulk nanocomposite. The reported elastic modulus of the nanocomposite nearly doubles due to the presence of HfC nano particulates in the W matrix. High resolution transmission electron microscopy (HRTEM) revealed the retention of nanostructures at the select process conditions and is correlated with the enhanced mechanical properties of the nanocomposite. Published by Elsevier B.V.

Near-Net-Shape Tungsten–Rhenium Alloy Parts Produced by Plasma Spray Forming and Hot Isostatic Pressing

“…Recently, researches on fabrication tungsten or tungsten-based parts by PSF have been reported by Wu et al, 9) Rea et al, 10) Hovis et al, 6) Mutasim et al…”

“…Rea et al 10) explored and characterized vacuum plasma spray formed tungsten parts reinforced by nanoscale HfC particles. In addition, a blend of W, nickel (Ni) and iron (Fe) powders was plasma sprayed onto a mandrel of desired configuration, as described by Hovis et al 6) They claimed that the formation of thin-walled structure made by plasma spraying can significantly reduce shrinkage and prevent cracks while enhance physical properties comparing those obtainable by PM method.…”

Solid‐State Reactions of SiC/W–25Re Alloy and Thermal Stability of SiC/Ti/W–25Re Alloy under High‐Temperature Annealing

“…The functional structure which attaching these refractory materials on the surface of ceramic or carbon/carbon composite can have substantial advantages of high performance, cost effectiveness and light weight. [3][4][5] Requirements for these combined ceramic or carbon/carbon composite are endurance under high temperature and the chemical stability with the refractory material. At room temperature, lots of promising refractory materials such as W, Re, and W-Re alloy do not form carbides with ceramic or carbon/carbon composite but under the high temperature, W and Re can form a solid solution with carbon.…”

Near-Net-Shape Molybdenum Parts Produced by Plasma Spray Forming

“…8,9) Almost any feedstock can be sprayed onto the mandrel in a controllable manner to provide a compact of desired shape and wall thickness with benefits of simplifying fabrication process and cost reduction. Recently, researches on fabrication refractory metallic tungsten (W) or W-based products by PSF have been reported by Wu et al 10) and Rea et al 11) The former 10) presented the technique of PSF method to make large-scale W tubular heating elements, while the latter 11) explored and characterized vacuum plasma spray formed W alloy parts reinforced by nanoscale HfC particles. In addition, Chwa et al 12) reported that Mo-Cu composites fabricated by vacuum plasma spraying.…”

“…13) In order to reduce these defects, applying HIPing to further densify the deposits (including ceramics, intermetallics and high-temperature metallic alloys) has been reported by several groups. 10,11,14,15) Those early works showed that HIPing played great influence on microstructure changes and physical properties of plasma sprayed deposits. However, to our knowledge, there is no work on the relation between microstructure and mechanical property of PSF Mo parts before and after HIPing treatment.…”