【正文】 intact preform ejection after molding. Key parameters include: PZT/binder ratio, PZT element diameter and taper, PZT base thickness, tool surface finish, and the molded part ejection mechanism design. In order to evaluate these process parameters without incurring excessive tool cost, a tool design having only two rows of 19 PZT elements each has been adopted for experimental purposes. Each row contains elements having three taper angles (0, 1 and 2 degrees) and two diameters ( and l mm). To acmodate molding shrinkage, the size of the preform is maintained at 5Ox50mm to minimize the possibility of shearing off the outermost fibers during the cooling portion of the molding cycle.Figure 3 shows green ceramic preforms fabricated using this tool configuration. Note that all of the PZT elements ejected intact after molding, including those having no longitudinal tapering to facilitate ejection. Slow heating in air has been found to be a suitable method for organic binder removal. Finally, the burnedout preforms are sintered in a PbOrich atmosphere to 9798% of the theoretical density. No problems have been encountered with controlling the weight loss during sintering of these posite preforms, even for those finescale, highsurface area preforms which are intended for high frequency ultrasound.Figure 4 illustrates the surfaces of asmolded and assintered fibers, showing the presence of shallow fold lines approximately 10pm wide, which are characteristic of the injection molding process. The fibers exhibit minor grooving along their length due to ejection from the tool. Figure 5 shows the capability of near netshape molding for fabricating very fine scale preforms。 rapid throughput (typically seconds per part)。通過陶瓷的注射成型來制造合成物型坯，之后使用型坯來形成大批生產(chǎn)，此種方法已經(jīng)證明用于網(wǎng)狀大量制造壓電復合物傳感器。圖6所示復合材料樣品使用剛才復合的壓電陶瓷/粘結劑混合物以及再生材料制造?？諝庵械木徛訜嵋呀?jīng)被發(fā)現(xiàn)是一個適合去除有機粘合劑的方法。如圖2b所示的方法使用了無需導致額外重組成本的嵌入式的并允許局部變化的設計。對于陶瓷，型腔必須無損拆除，迫使高的固體載荷，嚴格控制型腔移除的過程，以及適當?shù)膴A具。注塑成型過程克服了通過網(wǎng)型預成型陶瓷纖維整列使裝配導向陶瓷纖維進入復合材料傳感器的困難。最近，纖維材料公司已經(jīng)證明了其用于纖維增強復合材料的編織技術在裝配壓電材料方面的適應性。檢漏器的性能系數(shù)可使得這個復合物超過那些通過適當選擇階段特征和復合結構的固體材料10000倍。 附件1：外文資料翻譯譯文通過注射成型制造壓電陶瓷/聚合物復合材料Leslie J. Bowen 和 Kenneth W. French原料系統(tǒng)(有限)公司摩洛哥康考德希爾克雷斯特大道53號, 郵編01742摘要賓夕法尼亞州立大學材料研究室的研究已經(jīng)證明通過使用壓電陶瓷/聚合物復合材料可以改進檢漏器(水診器)潛能。這些合成物已經(jīng)被開始用于高解析度超聲醫(yī)學以及海軍的發(fā)展應用。在過去的五年里，為了提高制造行業(yè)的生存能力并降低材料成本已經(jīng)多次嘗試簡化傳感器的組裝工藝。然而，這種方法需要為每一個部分制造一個新的模具。如圖1所示，注塑成型方法已被用于壓電陶瓷的成型。在聚合物封裝后采用磨削去除陶瓷胚。為了容許成型收縮，預加工的工件尺寸維持在50mmX50mm，以盡量減少在制模周期中的冷卻部分折斷外層纖維的可能性。圖5所示近似網(wǎng)狀的成型方式用于制造非常精細尺度的型坯的能力；所示壓電元件的尺寸只有30um。*粉末的提供方是俄亥俄州貝德福德的摩根士丹利公司，105A街區(qū)。灣諾爾斯，物理研究所出版，頁139142 。 PZT element dimensions only 30pm wide have been demonstrated. The assintered surface of these elements indicates that the PZT ceramic microstructure is dense and uniform,n consisting of equiaxed grains 23pm in diameter. Figure 3: Injection Molded 13 Composite Preforms. Figure 4: Scanning Electron Micrographs of Asmolded(Upper) and Assintered (Lower) Surfaces of PZT Fibers Figure 5: Finescale 22 Composite formed by Near Netshape olding (Upper Micrograph). Assintered Surface(Lower Micrograph).In order to demonstrate the layup approach for posite fabrication, posites of approximately 10 volume percent PZT5H fibers and Spurrs epoxy resin were fabricated by epoxy encapsulating laidup pairs of injection molded and sintered fiber rows followed by grinding away the PZT ceramic stock used to mold the posite preform. Figure 6 shows posite samples made