Accession Number : ADP007459

Title :   Study on Diopside Whiskers Precipitation Type Hydroxyapatite,

Corporate Author : TDK CORP CHIBA (JAPAN) RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Nonami, Toru

Report Date : FEB 1991

Pagination or Media Count : 6

Abstract : A biomedical material for use as artificial bone and dental root is provided which takes the form of a sintered composite body comprising a Hydroxyapatite(HAP) and diopside whisker. The mixed powder of HAP and diopside was heated to make this composite material. The sintering of HAP d of and the precipitation of diopside whisker ere examined, to find a method making them occur simultaneously. Also, diopside was added to HAP and sintering at 1200 C for 2hr. was done. As a result of these investigations, diopside whisker of aspect ratio 10-15 was formed. Moreover the intermediate layer of CaO-SiO2lP205-MgO system was generated at the interface of HAP and whisker. The bending strength of this sintered body was 300MPa and fracture toughness was 3.2M Pa.m 1/2. These values were higher by about 2times or in bending 3times than those of matrix HAP respectively. The increase strength was attributed to an increase in fracture toughness, caused by an increase in fracture surface energy.

Descriptors :   *COMPOSITE MATERIALS, *WHISKER COMPOSITES, ASPECT RATIO, BENDING, BODIES, BONES, ENERGY, INTERFACES, LAYERS, MATERIALS, POWDERS, PRECIPITATION, RATIOS, SINTERING, SURFACE ENERGY, SURFACES, TOUGHNESS, VALUE.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE