干湿条件下不同稳定性磷酸钙涂层的疲劳行为。

J A Clemens, J G Wolke, C P Klein, K de Groot
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引用次数: 27

摘要

为了获得稳定的等离子喷涂磷酸钙涂层,开发了高结晶度、低溶解度的涂层。然而,陶瓷涂层的稳定性也受到其抗疲劳性能的影响。最近,疲劳失效被用来解释植入物在载荷条件下涂层脱落的原因。为此,对不同结晶度的等离子喷涂磷酸钙涂层进行了体外疲劳失效研究。非晶和结晶羟基磷灰石涂层(AHA和CHA)和高结晶氟磷灰石涂层(FA)在干燥条件和模拟体液(SBF)中进行了循环载荷试验。SBF结果表明,结晶CHA和FA涂层在棒材的最高应力中部完全分离。FA涂层比CHA涂层更早分层。在测试结束时,非晶AHA涂层仅显示出部分涂层损失。在干燥条件下的测试没有发现涂层有任何变化。这些结果表明了磷灰石涂层的结晶度与其疲劳失效之间的关系:高结晶度涂层比非晶态磷灰石涂层表现出更早和更彻底的疲劳失效。可以得出结论,涂层的稳定性不仅取决于静态溶解,还取决于疲劳破坏。
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Fatigue behavior of calcium phosphate coatings with different stability under dry and wet conditions.

To obtain stable plasma sprayed calcium phosphate coatings, coatings with a high crystallinity and low solubility were developed. However, stability of ceramic coatings is also influenced by their fatigue resistance. Recently, fatigue failure was proposed to explain coating detachment from implants under loaded conditions. Therefore, plasma-sprayed calcium phosphate coatings with different crystallinity were investigated in vitro for fatigue failure. An amorphous and a crystalline hydroxylapatite coating (AHA and CHA) and a highly crystalline fluorapatite coating (FA) were subjected to cyclic load tests, both in dry conditions and in simulated body fluid (SBF). The results in SBF revealed that the crystalline CHA and FA coating detached completely at the highest stressed middle section of the bar. The FA coating delaminated earlier than the CHA coating. The amorphous AHA coating showed only partial coating loss at the completion of the test. Tests in dry conditions did not reveal any change in the coatings tested. These results suggest a relation between crystallinity of apatite coatings and their failure due to fatigue: high crystallinity coatings demonstrate earlier and more complete fatigue failure than the amorphous apatite coatings. It can be concluded that coating stability is not determined solely by static dissolution, but by fatigue failure as well.

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