Abstract
To fabricate W-ZrC composite through reaction sintering at first WC and ZrO2 powders with molar ratio of 3-1 are ball milled, then the green body made from this mixture is sintered. Since reactivity is the main problem in sintering of mironized powders the starting ZrO2 powder is selected in nano size to see whether the reaction improves. The XRD pattern indicates that W-ZrC composite has been formed, although some unreacted compounds still exist and some unwanted components have been created. In the case of using nano powders the amount of unreacted WC and ZrO2 phases and unwanted W2C phase reduces and the reaction progresses better. Additionally by using nano powders the reaction progressed and the mechanical proprieties including density, hardness, Elastic modulus and Flexural strength improved.
Highlights
To improve low-temperature plasticity in tungsten and its strength at high temperature, making composite is an effective way
3) Reaction sintering: It is a new method for producing W/ZrC composite in which metal powders are subjected to high temperatures, typically in an inert atmosphere or under vacuum
In spite of that some WC and ZrO2 phases are observed which illustrates that reaction between these two phases to form W/ZrC composite was not complete
Summary
To improve low-temperature plasticity in tungsten and its strength at high temperature, making composite is an effective way. 3) Reaction sintering: It is a new method for producing W/ZrC composite in which metal powders are subjected to high temperatures, typically in an inert atmosphere or under vacuum. In this method ZrO2 and WC powders are mixed in desired volume or mass fraction, at the presence of a suitable binder. The W-ZrC composite is fabricated by reaction sintering of WC and ZrO2 Powders that are selected in micron and nano size to see the differences between the resultant composites. By secondary electron microscopy (SEM) and back scattered electron (BSE) the morphology of samples are studied
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