Cold compaction behavior and pressureless sinterability of ball milled WC and WC/Cu powders

Abstract

In this research, cold compaction behavior and pressureless sinterability of WC, WC-10%wtCu and WC-30%wtCu powders were investigated. WC and WC/Cu powders were milled in a planetary ball mill for 20h. The milled powders were cold compacted at 100, 200, 300 and 400 MPa pressures. The compressibility behavior of the powders was evaluated using the Heckel, Panelli-Ambrosio and Ge models. The results showed that the Panelli-Ambrosio was the preferred equation for description the cold compaction behavior of the milled WC and WC-30%wtCu powders. Also, the most accurate model for describing the compressibility of WC-10%wtCu powders was the Heckel equation. The cold compacts were sintered at 1400 o C. It was found that by increasing the cold compaction pressure of powder compacts before sintering, the sinterability of WC-30%wtCu powder compacts was enhanced. However, the cold compaction magnitude was not affected significantly on the sinterability of WC and WC-10%wtCu powders. The microstructural investigations of the sintered samples by Scanning Electron Microscopy (SEM) confirmed the presence of porosities at the interface of copper-tungsten carbide phases.

The Effect of Addition Graphite on the Physical Properties of a Copper Hybrid Compound Using Powder Technique

“…Copper fittings, which contain oxide and carbide particles, are usually made using powder mining technology. Since this technology is being increasingly used for a number of reasons, including low cost and short processing time, the powders are mixed with a pre-determined volumetric fracture, then the powders are combined with cold pressure and sintered at an appropriate temperature, as the sintering temperature depends on the melting temperature Basic Article (Hashemi et al 2016, Stobrawa et al 2009. This work has focused on studying the effect of increasing concentrations of graphite on the thermal conductivity of hybrid copper-based compounds, due to the lack of systematic studies on the thermal conductivity of these compounds as indicated by the researchers, (Kovacik et al 2015) where most studies are interested in studying electrical and mechanical properties (Mehar et al 2017).…”

Microstructure, wear and corrosion properties of NiB-TiC composite materials produced by powder metallurgy method

“…In addition, the elemental powder mixtures can be produced as solid, intermetallic and amorphous phases. Mechanical alloying is often used in manufacturing processes with powder metallurgy [13,14].…”

Development of the composite material and coatings based on niobium carbide

“…Using such materials is promising in order to apply coatings with specialized physical-mechanical characteristics, as well as to improve wear resistance of the tribojunctions' surfaces that operate under extreme conditions [1]. The most common among such materials are the composites of the WC−Cu system [2]. Extending the range of ceramic materials for the composites with a copper bonding is significantly hindered by the low wetting capacity of copper and conventional copper alloys.…”