Synthesis and Hot Pressing of ZnS Powders
Abstract
A comprehensive investigation into the processing of ZnS, which involve synthesis and characterization of submicron powders and their processing at elevated temperature to produce dense ceramic parts, was the main objective of this investigation. Thermomechanical characterization of the dense polycrystalline ceramics is also an integral part of such a study, and is underway. Zinc sulfide powders with submicron particle size were prepared by homogeneous precipitation from acidic zinc solutions by aging with thioacetamide at elevated temperatures. Monosize, polycrystalline particles having 0.35 micrometer diameter were obtained. Sulfide ion generation rate in solution depended on temperature, pH and initial thioacetamide concentration. The rate of sulfide ion generation, in turn, influenced precipitation kinetics and particle morphology. The types of supporting anions in solution also influenced the morphology of the particles produced Monosize powders were hot pressed for various time, temperature and pressure combinations. Compacts achieved near- theoretical density in less than 30 minutes at temperatures 850-900 C and applied pressures of about 70-105 MPa. The dominant densification mechanisms were identified at various stages of the process.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 30, 1989
- Accession Number
- ADA209602
Entities
People
- Ahmet Celikkaya
- Mufit Akinc
Organizations
- Iowa State University