Processing of WC/W Composites for Extreme Environments by Colloidal Dispersion of Powders and SPS Sintering

García Ayala, Esperanza Macarena and Tarancón Román, Sandra and González Granados, Zoilo and Ferrari Fernández, Begoña and Pastor Caño, José Ignacio and Sánchez Herencia, Antonio Javier (2019). Processing of WC/W Composites for Extreme Environments by Colloidal Dispersion of Powders and SPS Sintering. "International Journal of Refractory Metals & Hard Materials", v. 84 ; p. 105026. ISSN 0263-4368. https://doi.org/10.1016/j.ijrmhm.2019.105026.

Description

Title: Processing of WC/W Composites for Extreme Environments by Colloidal Dispersion of Powders and SPS Sintering
Author/s:
  • García Ayala, Esperanza Macarena
  • Tarancón Román, Sandra
  • González Granados, Zoilo
  • Ferrari Fernández, Begoña
  • Pastor Caño, José Ignacio
  • Sánchez Herencia, Antonio Javier
Item Type: Article
Título de Revista/Publicación: International Journal of Refractory Metals & Hard Materials
Date: November 2019
ISSN: 0263-4368
Volume: 84
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Tungsten and tungsten carbide are materials with high thermomechanical response that are used or have been proposed for extreme environment applications such as first plasma face, or cutting tools. The high melting temperature and strong bonding energy of both materials force the use of powder metallurgical processes and non-conventional sintering routes to achieve dense parts. Consequently, a high dispersion and close contacts of the starting powders are required. In this paper tungsten and tungsten carbide powders are colloidally processed and mixed to achieve composite powders that are sintered later by Spark Plasma Sintering. Starting micrometric tungsten carbide and nanosized tungsten powders are dispersed in water at pH?3. By using a cationic dispersant, the surface charge of the nanosized W suspended in water reverses to positive, ensuring its attachment to the carbide surfaces and the good dispersion of the two phases when both slurries are mixed. Composite powders with volumetric rations of 50WC/50W, 80WC/20W and 90WC/10W as well as pure WC and W are sintered by SPS following the dimensional change of the specimens during the process. It has been proved that complete coverage of the micronic WC by the nanosized W powders, achieved with this colloidal approach, makes the tungsten govern the initial sintering stages. The derivative of the sintering curves is used to detect the solid state reactive sintering temperature of W2C. After sintering, XRD and SEM observations indicate that all the mixture compositions yield to ceramic materials with different W2C/WC ratios, depending on the initial compositions. Dispersion of the two phases is high and no remaining W is detected. Flexure tests at room temperature show that composite materials present a slightly lower fracture strength than pure WC.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2015-70780-C4-1-PING4MATERUnspecifiedCompuestos cerámica-metal y aleaciones refractarias de W para su aplicación bajo condiciones de servicio severas: diseño microestructural y nuevas rutas de procesamiento
Government of SpainMAT2015-70780-C4-4-PING4MATERUnspecifiedCompuestos cerámica-metal y aleaciones refractarias de W para su aplicación bajo condiciones de servicio severas: diseño microestructural y nuevas rutas de procesamiento
Madrid Regional GovernmentS2018/NMT-4411ADITIMAT-CMUnspecifiedAdditive Manufacturing: from Material to Application
Government of SpainIJCI-2016-28538UnspecifiedUnspecifiedUnspecified
Government of SpainBES-2016-079038UnspecifiedUnspecifiedUnspecified

More information

Item ID: 65631
DC Identifier: http://oa.upm.es/65631/
OAI Identifier: oai:oa.upm.es:65631
DOI: 10.1016/j.ijrmhm.2019.105026
Official URL: https://www.sciencedirect.com/science/article/pii/S0263436819305463#!
Deposited by: Memoria Investigacion
Deposited on: 09 Dec 2020 16:09
Last Modified: 09 Dec 2020 16:09
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