Preparation of nanospherical amorphous zircon powders by a microemulsion-mediated process

Sintering of Zircon Powders

Preparation of nanocrystalline TiN coated cubic boron nitride powders by a sol-gel process.

Cubic boron nitride (cBN) particles coated with 20 wt% nanocrystalline TiN were prepared by coating the surface of cBN particles with TiO2, followed by nitridation with NH3 gas at 900 degrees C. Coating of TiO2 on cBN powders was accomplished by a sol-gel process from a solution of titanium (IV) isopropoxide and anhydrous ethanol. An amorphous TiO(x) layer of 50 nm thickness was homogenously fo...

Preparation of (Pb,Ba)TiO3 powders and highly oriented thin films by a sol-gel process

Solid solution Pb1-xBaxTiO3, with particular emphasis on Pb0.5Ba0.5TiO3, was prepared using a sol-gel process incorporating lead acetate trihydrate, barium acetate, and titanium isopropoxide as precursors, acetylacetone (2,4 pentanedione) as a chelating agent, and ethylene glycol as a solvent. The synthesis procedure was optimized by systematically varying acetylacetone: Ti and H2O:Ti molar rat...

Preparation of Property-Controlled Bi-Based Solder Powders by a Ball-Milling Process

Three kinds of Bi-based solder powders with different chemical compositions of binary Bi–Sn, ternary Bi–Sn–In, and quaternary Bi–Sn–In–Ga were prepared using a gas atomization process and subsequently ball-milled for smaller-size fabrication. In particular, only the quaternary Bi–Sn–In–Ga solder powders were severely broken to the size of less than 10 μm in a polyhedral shape due to the presenc...

The crystallization process of amorphous Al80Fe20 alloy powders prepared by ball milling

The amorphous-to-crystalline transition during thermal annealing of amorphous Al80Fe20 alloy powders prepared by ball milling was investigated by means of magnetothermal analysis and X-ray di€raction. Following structural relaxation and stress relief processes, a metastable phase precipitates during primary crystallization, and a mixture of intermetallic compound (h-Al13Fe4) and fcc Al is devel...