مواد کامپوزیت دی الکتریک با یک فاز رسانای گسسته

composite dielectric materials with a Discrete conducting phase 

مواد کامپوزیت دی الکتریک با یک فاز رسانای گسسته

 

ABSTRACT

A class of composite dielectric  materials refers to a two-phase refer ، host inclusion system in which the inclusion is a discrete- phase of conducting medium ( such as metals ، semiconductors ، or solid electrolytes ) dispersed randomly or textured as an orderly embedment in the host medium which forms a dielectric  receptacle . such composite are essentially dielectric – conductor mixtures and have Unique ( effective )  dielectric properties due to the fact that the constituent phases have extremely opposite characteristics as regards their electrical susceptance and the associated conduction phenomena .

تأثیر مقدار HfC بر خواص مکانیکی کامپوزیت های HfC-W

The effect of HfC content on mechanical properties HfC–W composites

تأثیر مقدار HfC بر خواص مکانیکی کامپوزیت های HfC-W

ABSTRACT

For improving the mechanical properties of tungsten, HfC–W composites were fabricated by ball milling and spark plasma sintering process. Themicrostructure andmechanical properties of the compositeswere investigated. The interdiffusion of the Hf and Watoms during sintering produced a mixed carbide, identified as (Hf,W)C. This interfacial mixed carbide helped in developing a good interface joint with the adjacentW matrix. The increase in mechanical properties of the HfC–W composite at room temperature as well as high temperature was attributed to the reinforcement effect of the HfC particles. One of the strengthening mechanisms of the composite can be attributed to the formation of mixed carbide (Hf,W)C by interdiffusion at the interface, which assured the effective load transfer from the Wmatrix to the hard HfC particles.