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首页> 外文期刊>Journal of Materials Research >Wear of hydroxyapatite sliding against glass-infiltrated alumina
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Wear of hydroxyapatite sliding against glass-infiltrated alumina

机译：羟基磷灰石在玻璃渗透氧化铝上的磨损

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This work reports on the processes involved in the wear of hydroxyapatite sliding against slip-cast, glass-infiltrated alumina. Synthetic hydroxyapatite was used as a model material representing tooth enamel, while the alumina used was designed for tooth restorations. The wear tests were conducted in distilled water using a pin-on-disk tribometer under contact conditions that mimic the oral environment. To investigate the wear process for this material system, the surfaces of the hydroxyapatite "pin" and the alumina "disk" were examined by scanning electron microscopy and atomic force microscopy. Transmission electron microscopy was used to examine wear debris fragments collected from the hydroxyapatite wear scar and, for comparison, the bulk structure of the pin and crushed fragments from an unworn pin. Wear tracks on glass-infiltrated alumina showed only minor damage consisting of removal of glass from intergranular pockets in this material. In contrast, the hydroxyapatite wear surfaces were covered by an adhered debris layer, which obscured the rough, underlying surface. When dried, this adhered layer was found to contain both single-crystal and polycrystalline hydroxyapatite fragments, together with porous amorphous particulates, containing Ca, P, and O as major elements and Al and La as minor constituents. The composition of this amorphous wear product suggests a tribochemical reaction of hydroxyapatite and infiltrated alumina with water. The wear process, therefore, consists of material removal by fracture and deformation of the hydroxyapatite, followed by mixing of the crystalline fragments with the reaction products and the glass-infiltrate to form a uniform debris layer on the hydroxyapatite wear surface. The effects of this surface layer on wear are considered to include moderation of the local contact stresses and control of the immediate environment under which wear occurs. Our wear data, represented in terms of the wear factor, are found to be consistent with published data on the wear of tooth enamel sliding against different types of ceramic restorations.
机译：这项工作报告了羟基磷灰石在滑动浇铸的玻璃渗透氧化铝上滑动所涉及的过程。合成的羟基磷灰石被用作代表牙齿珐琅质的模型材料，而所用的氧化铝则被设计用于牙齿修复。使用销盘式摩擦计在模拟口腔环境的接触条件下在蒸馏水中进行磨损测试。为了研究该材料系统的磨损过程，通过扫描电子显微镜和原子力显微镜检查了羟基磷灰石“针”和氧化铝“圆盘”的表面。使用透射电子显微镜检查从羟基磷灰石磨损痕迹收集的磨损碎片碎片，并进行比较，以比较销的整体结构和未磨损销的压碎碎片。玻璃渗透的氧化铝上的磨损痕迹显示出很小的损坏，包括从这种材料的晶间袋中除去玻璃。相反，羟基磷灰石的磨损表面被附着的碎屑层覆盖，该碎屑层遮盖了粗糙的下面的表面。干燥后，发现该粘附层既包含单晶和多晶羟基磷灰石碎片，又包含以Ca，P和O为主要元素，Al和La为次要成分的多孔无定形颗粒。该无定形磨损产物的组成表明羟基磷灰石和渗透氧化铝与水的摩擦化学反应。因此，磨损过程包括通过羟基磷灰石的断裂和变形来去除材料，然后将结晶碎片与反应产物和玻璃渗透物混合以在羟基磷灰石的磨损表面上形成均匀的碎屑层。该表面层对磨损的影响被认为包括局部接触应力的减轻和对发生磨损的直接环境的控制。我们发现，以磨损系数表示的磨损数据与已发表的有关牙釉质在不同类型的陶瓷修复体上滑动的磨损数据一致。

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