Activated sintering of Tungsten heavy alloy

Abstract

In the present work, characterization of sintering behavior of Tungsten heavy alloy has been done through powder metallurgy route using Spark plasma sintering (SPS). Fine powder of Tungsten (<30 µm) was separately mixed with Ni, Co, Fe, Mo and Cu each with 1 weight%. Spark Plasma Sintering (SPS) technique (1200°C, 20 MPa pressure with 1 min holding time) was used to sinter the mixed powders. The maximum density was observed in W-Ni followed by Co, Fe, Cu, Mo and with least in pure tungsten sample. Optical microscopy as well SEM was done to determine the microstructure and grain coarsening. Due to the short heating time very less grain coarsening was observed. Vickers hardness test was conducted which resulted in maximum hardness in case if W-1Fe SPS sample.

The densification behavior of metals and alloys during spark plasma sintering: A mini-review

“…8a and b) [16,[60][61][62][63]. For instance, Hwan-tae et al [64] observed a temperature difference more than 130 o C between the center and periphery surface of nickel sample at the maximum temperature of 930 o C. In the SPS tools, the temperature of the die is usually measured by a thermocouple [66] or pyrometer [53]. In fact, there is no scalable method to measure the exact temperature in various regions of the sample and validate the simulation results.…”

Morphological, microstructural and magnetic characteristics of electrodeposited Ni-Fe-W-Cu alloy powders

“…Annealing nanostructured materials at elevated temperatures causes changes in their microstructure, leading to changes in their physical and chemical properties [12][13][14][15][16][17][18][19][20][21][22][34][35][36]. At temperatures below the crystallization temperature, the alloy undergoes structural relaxation, whereas amorphous phase crystallization and nanocrystalline grain growth occur at higher temperatures.…”

“…At temperatures below the crystallization temperature, the alloy undergoes structural relaxation, whereas amorphous phase crystallization and nanocrystalline grain growth occur at higher temperatures. These changes affect mechanical, electrical and magnetic properties, corrosion resistance, thermal stability, and catalytic activity [12][13][14][15][16][17][18][19][20][21][22][34][35][36].…”