氧化锆基纳米羟基磷灰石功能梯度材料的制备及(6)

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背景：研究表明在氧化锆基体表面涂覆纳米羟基磷灰石涂层，既具有较高的强度和韧性又具有良好的生物相容性，是较为理想的硬组织替代材料，但涂层易从氧化锆表面脱落成为其致命缺陷。

目的：应用梯度复合技术制备以纯氧化锆为基体、中间为梯度层、表面为纯纳米羟基磷灰石的功能梯度生物陶瓷，并筛选其最佳力学性能的设计方案及烧结温度。

方法：以氧化锆和纳米羟基磷灰石粉末为原料，应用粉末冶金法中的叠层法制备陶瓷生坯试件，根据基体氧化锆层厚度的不同分为 A组(40 mm)、B组(30 mm)、C组(20 mm)，每组又根据氧化锆/纳米羟基磷灰石复合材料梯度层数的不同分为1组(3层)、2组(5层)、3组(7层)，9组共162个陶瓷生坯试件，分别将坯体以不同温度烧结(1 300，1 350，1 400，1 450，1 500，1 550 ℃)为陶瓷试件，将其加工成矩形试样进行力学性能检测。

结果与结论：①采用10 MPa单面垂直加压可形成氧化锆基纳米羟基磷灰石梯度功能材料生坯试件；②随着梯度层数及烧结温度的增加，各组功能梯度生物陶瓷的力学性能随之增强，当烧结温度为1 550 ℃时，梯度层数为7、基体厚度为40 mm的功能梯度生物陶瓷力学性能最优，与其他8组比较差异有显著性意义(P＜0.05)；③按最佳梯度设计方案，采用高温烧结技术制备的氧化锆基纳米羟基磷灰石功能梯度材料陶瓷试件具有较高的力学性能。

BACKGROUND:Studies have shown that the nano-hydroxyapatite coating on the surface of zirconia has not only high strength and toughness,but also good is an ideal substitute for hard ,the coating is easy to fall off from the surface of zirconia,which is a fatal defect.

OBJECTIVE:To prepare functionally graded bioceramics with pure zirconia as matrix,gradient layer in the middle and nano-hydroxyapatite on the surface by gradient composite technology and to screen the optimal mechanical properties and sintering temperature.

METHODS:Using zirconia and nano hydroxyapatite powder as raw materials,ceramic specimens were prepared by the lamination method in powder to the thickness of zirconia layer,three groups A (40 mm),B (30 mm) and C (20 mm) were group was sub-divided into three subgroups 1 (3 layers),2 (5 layers) and 3 (7 layers).Thus,there were 162 ceramic specimens in nine ceramic specimens were sintered at different temperatures (1 300,1 350,1 400,1 450,1500,and 1 550 °C) and then processed into rectangular specimens for mechanical property testing.

RESULTS AND CONCLUSION:The zirconia-based nano-hydroxyapatite functionally graded material can be formed by 10 MPa single side vertical the increases in the number of gradient layers and sintering temperature,the mechanical properties of the functionally graded bioceremics in each group were functionally graded bioceramics had the optimal mechanical properties when sintering temperature was 1 550 °C,the number of gradient layers was 7,and substrate thickness was 40 mm.The optimal mechanical property of the functionally graded bioceramics produced at above parameter was significantly superior to that produced at other eight sets of parameters (P＜0.05).According to the optimal gradient design,the zirconia-based nano-hydroxyapatite functionally graded ceramic specimens prepared by high temperature sintering technique have stronger mechanical properties.

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