Misunderstanding of porous coated anatomic porous layer bonded by sintering technology
10.3969/j.issn.1673-8225.2009.47.031
- VernacularTitle:采用烧结工艺粘结多孔层植入体多孔层的误解
- Author:
Changxing LIU
;
Wanlin GUO
;
Tianwen LI
- Publication Type:Journal Article
- From:
Chinese Journal of Tissue Engineering Research
2009;13(47):9337-9340
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE: Sintering of porous coated anatomic porous layer bonding technology remains controversial because of poor understanding to its essence.ESSENCE: Sintering is a technology that the bonding temperature exceeds 5 ℃ or higher than the base-alloy solids temperature of 1 230 ℃, resulting in base-alloy produce a series of serious problems, such as grain boundary racks, handle broken and so on.HAZARDS: In sintering temperature, the low melting point eutectlc phase and the brittle metal compounds flow out of the grain boundary to bond the small metal balls and the handle, which greatly reduces the fatigue strength. The grain boundary cracks formed and expanded ultimately leading to handle broken.DISCUSSION: The cause of a handle broken is neither notch nor metallurgical defects but sintering process, because high sintering temperature results in grain-boundary lacunas.CONCLUSION: Sintering is not suitable for connecting the force components. High sintering temperature produces grain-boundary lacunas which can expand into cracks and ultimately result in handle broken under some condition.
