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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Pt-Al_2O_3 interfaces in cofired ceramics for use in miniaturized neuroprosthetic implants
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Pt-Al_2O_3 interfaces in cofired ceramics for use in miniaturized neuroprosthetic implants

机译：Cofired陶瓷中的PT-AL_2O_3接口用于小型化神经调节植入物

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A core element to miniaturized, hermetic encapsulations for neuroprosthetic implants with high numbers of stimulation channels is the creation of electrical feed-throughs. Platinum (Pt) and alumina (Al_2O_3) are necessary to connect the sealed electronics to external components including electrode arrays that provide a neural interface function, as weil as to sources of power or data. Combined with laser micro-processing, high-density feedthrough arrays were created with up to 2500 channels per cm2. The chemistry, micro structure, and crystallography of the Pt-Al_2O_3 interface created by the cofiring of Pt particles and Al_2O_3 particulate in binder were studied by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and selective area electron diffraction (SAED) to determine the nature of the Pt-Al_2O_3 bond. While Pt-Al_2O_3 interfaces only occurred in cases where the different grains were in distinct orientations where the crystal lattices matched, the addition of glass additives allowed for bonding nonmatching orientations by devitrification to form Pt-glass-Al_2O_3 interfaces. The conditions for the formation of both mechanisms were determined, and it was shown that higher order crystal planes than previously described can be matched. Analyzing the lattice matches in detail showed the ability of the material compound to compensate for mismatches by the formation of dislocations, out-of-angle matching, lattice distortion, and the existence of semi-coherent interfaces in case of integer misfit ratios to create domain matching.
机译：具有大量刺激通道的神经治疗植入物的小型化的核心元素是产生电馈送的植入物。需要铂（PT）和氧化铝（AL_2O_3），以将密封电子器件连接到包括电极阵列的外部组件，该电极阵列提供神经界面功能，如电力或数据的源。结合激光微处理，采用高达2500个CM2的频道产生高密度馈通阵列。通过透射电子显微镜（TEM），能量分散光谱（EDS）和选择性区域电子衍射（SAED）研究通过在粘合剂的COFIRING和粘合剂中的粘合剂中的PT-AL_2O_3界面产生的PT-AL_2O_3界面的PT-AL_2O_3界面的粘合剂。确定PT-AL_2O_3键的性质。虽然PT-AL_2O_3界面仅发生在不同晶粒的不同取向的情况下，但在晶格匹配的晶格中的不同取向，允许通过缺失形成非匹配取向以形成Pt-Glass-Al_2O_3界面的玻璃添加剂。确定了两种机构形成的条件，结果表明可以匹配比先前描述的更高阶的晶平面。详细分析晶格匹配，显示了材料化合物通过形成脱位，角度匹配，晶格失真以及在整数错位比例创建域的情况下的半相干界面的存在来补偿不匹配的能力匹配。

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