Arias J L, Mayor M B, Pou J, Leng Y, León B, Pérez-Amor M
Departamento de Física Aplicada, Universidade de Vigo, Lagoas-Marcosende 9, 36200 Vigo, Spain.
Biomaterials. 2003 Sep;24(20):3403-8. doi: 10.1016/s0142-9612(03)00202-3.
Micro- and nano-testing methods have been explored to study the thin calcium phosphate coatings with high adhesive strength. The pulsed laser deposition (PLD) technique was utilised to produce calcium phosphate coatings on metal substrates, because this type of coatings exhibit much higher adhesive strength with substrates than conventional plasma-sprayed coatings. Due to the limitations of the conventional techniques to evaluate the mechanical properties of these thin coatings (1 microm thick), micro-scratch testing has been applied to evaluate the coating-to-substrate adhesion, and nano-indentation to determine the coating hardness and elastic modulus. The test results showed that the PLD produced amorphous and crystalline HA coatings are more ductile than titanium substrates, and the PLD coatings are not delaminated from the substrates by scratch. Also, the results showed that the crystalline HA coating is superior in internal cohesion to the amorphous one, even though the lower elastic modulus of amorphous coating could be more mechanically compatible with natural bone.
人们已经探索了微米和纳米测试方法来研究具有高附着力的薄磷酸钙涂层。采用脉冲激光沉积（PLD）技术在金属基底上制备磷酸钙涂层，因为这种类型的涂层与基底之间的附着力比传统等离子喷涂涂层高得多。由于传统技术在评估这些薄涂层（1微米厚）力学性能方面存在局限性，因此采用微划痕测试来评估涂层与基底之间的附着力，采用纳米压痕测试来确定涂层的硬度和弹性模量。测试结果表明，PLD制备的非晶态和晶态HA涂层比钛基底更具延展性，并且PLD涂层在划痕测试中不会从基底上分层。此外，结果表明，即使非晶涂层较低的弹性模量可能与天然骨在力学上更具相容性，但晶态HA涂层的内聚力优于非晶涂层。
