Effects of grinding on properties of Mg-PSZ ceramics prepared by the surface enrichment of zirconia powders

Book · Sun Oct 01 04:00:00 EDT 1995

OSTI ID:109748

Deb, S; Das, S R ^[1]

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1. Central Glass and Ceramics Research Inst., Calcutta (India). Ceramic Processing Section

Commercial grade zirconia powders of mean particle size of 3.21 microns were super-ground in wet condition in alcoholic medium in a Planetary Ball-Mill for 12-hours using a zirconia pot as well as balls, in order to avoid contaminations from the grinding media. Sedigraph analysis data show the mean particle sizes within the range of 0.4 to 0.2 micron. The super-ground zirconia powders were then treated with appropriate acid and alkali solutions in order to enrich the surfaces of zirconia powders. The chemical analysis reports depict the enrichment phenomena of the processed zirconia powders. Magnesium oxide of different mole percentages (3 to 9%) have been incorporated to the above super-ground and enriched zirconia powder and green specimens were prepared by pressing with a suitable pressure of 200 MPa to yield the green compaction density of 3.06 gm/cm{sup 3}. The compacted green specimens were sintered without pressure at 1,480 C in air followed by normal cooling. X-ray diffraction patterns of the above sintered and cooled specimens have confirmed the formation of Mg-PSZ ceramics with 40% tetragonal phase. The sintered PSZ-products have shown very good surface properties but at the cost of transverse rupture strength. The effects of grinding were observed on the above Mg-PSZ ceramics which exhibit very little change in the tetragonal phase even after 30-minutes of grinding with a 60-mesh diamond wheel at a normal pressure of 4 kg/cm{sup 2}.

• OSTI ID: 109748
• Report Number(s): CONF-950521--; ISBN 1-56676-313-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
CHEMICAL COMPOSITION
CRYSTAL-PHASE TRANSFORMATIONS
EXPERIMENTAL DATA
GRINDING
HARDNESS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
POROSITY
POWDERS
SCANNING ELECTRON MICROSCOPY
SINTERING
WEAR
X-RAY DIFFRACTION
ZIRCONIUM OXIDES