共查询到19条相似文献,搜索用时 390 毫秒
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陶瓷粉末注射成型计算机模拟研究与应用 总被引:1,自引:0,他引:1
本文介绍了计算机模拟软件在陶瓷粉末注射成型工艺中的应用现状,举例说明了C-Mold软件在陶瓷粉末注射成形工艺模拟薄体半球的填充,并与实验的实际情况做比较,以探讨陶瓷材料在充填过程中的现象。 相似文献
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陶瓷注射成形(CIM)是一种近净尺寸成形工艺,适用于体积小、形状复杂、成形精度高的陶瓷结构件。笔者介绍了CIM的基本工艺过程,包括陶瓷粉体和粘结剂的选择、喂料制备、注射工艺和脱脂工艺。重点阐述了粘结剂的性能及分类、脱脂工艺研究进展以及微注射成形和低压注射成形新技术。最后对陶瓷注射成形的发展趋势进行了展望。 相似文献
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氮化硅陶瓷具有高强度、高硬度、耐高温、耐腐蚀、导热性好、摩擦系数小、热膨胀系数小、抗热震性好等优点,是耐高温、耐磨的理想结构材料之一。由于氮化硅硬度大.难以用传统的加工方法进行加工,限制了其在一些领域的广泛应用。陶瓷注射成形的出现为氮化硅陶瓷再添生机,氮化硅注射成形不仅可净尺寸成形各种形状复杂的异形件.而且成形产品具有较高的表面光洁度和尺寸精度。本文较详细介绍了陶瓷注射成形的工艺过程及Si3N4陶瓷注射成的研究讲展.最后对Si3N4陶脊沣射成形枯术讲行了展望. 相似文献
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《Journal of the European Ceramic Society》2000,20(12):2175-2181
The properties of ceramic powder–paraffin suspensions for low-pressure injection moulding (LPIM) is of critical importance to the successful production of high quality ceramic parts. Due to the high hygroscopicity of fine alumina powder, water introduced into the suspension at any stage of the production prior to sintering, may significantly influence its rheological behaviour and hence determine the process parameters as well as the properties of the sintered ceramics. In the industrial environment humidity cannot easily be avoided. Its effect is usually detrimental — it causes flocculation, which is usually the source of defects in sintered ceramics. However, according to the results of the present work, the effect can also be put to good use. Penetration of water into the as-moulded green parts facilitates binder removal and prevents defect formation during this processing step. 相似文献
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Khuram ShahzadJan Deckers Stijn BouryBram Neirinck Jean-Pierre KruthJef Vleugels 《Ceramics International》2012,38(2):1241-1247
Indirect selective laser sintering (SLS) is a promising additive manufacturing technique to produce ceramic parts with complex shapes in a two-step process. In the first step, the polymer phase in a deposited polymer/alumina composite microsphere layer is locally molten by a scanning laser beam, resulting in local ceramic particle bonding. In the second step, the binder is removed from the green parts by slowly heating and subsequently furnace sintered to increase the density. In this work, polyamide 12 and submicrometer sized alumina were used. Homogeneous spherical composite powders in the form of microspheres were prepared by a novel phase inversion technique. The composite powder showed good flowability and formability. Differential scanning calorimetry (DSC) was used to determine the thermal properties and laser processing window of the composite powder. The effect of the laser beam scanning parameters such as laser power, scan speed and scan spacing on the fabrication of green parts was assessed. Green parts were subsequently debinded and furnace sintered to produce crack-free alumina components. The sintered density of the parts however was limited to only 50% of the theoretical density since the intersphere space formed during microsphere deposition and SLS remained after sintering. 相似文献
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特种陶瓷的制备工艺综述及其发展趋势 总被引:1,自引:0,他引:1
本文主要介绍了粉末陶瓷原料的制备技术、特种陶瓷成形工艺、烧结方法以及未来的发展趋势。目前,特种陶瓷中的粉末冶金陶瓷工艺已取得了很大进展,但仍有一些面临急需解决的问题。当前阻碍陶瓷材料进一步发展的关键之一是成形技术尚未完全突破。压力成形不能满足形状复杂性和密度均匀性的要求。多种胶体原位成形工艺,固体无模成形工艺以及气相成形工艺有望促使陶瓷成形工艺获得关键性突破。 相似文献
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本文以含陶瓷粒子纤维为研究对象,以常规PET纤维作对比物,对其在高温高压及常压下的染色性进行了研究,结果表明,陶瓷粒子的存在使PET纤维的上染率提高,特别是常压上染率有大幅度提高。 相似文献
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不同工艺制备ZrO2—Al2O3复合陶瓷超细粉体的研究 总被引:2,自引:2,他引:2
采用正滴定工艺,反滴定工艺和水解工艺来制备ZrO2-Al2O3系复合陶瓷超细粉体。研究了制备工艺对水合氧化锆凝胶的包裹状态,煅烧后粉体中ZrO2颗粒的弥散状态以及烧结体显微结构的影响。结果表明采用水解工艺,ZrO2颗粒能均匀弥散在Al2O3颗粒周围,最终获得均匀细晶的陶瓷烧结体;在反滴定工艺中,虽然水合氧化锆凝胶能较好包裹Al2O3颗粒,但由于Al2O3颗粒本身得不到有效分散,因此在烧结体中出现了 相似文献
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壳聚糖凝胶注模成型氧化铝瓷的研究 总被引:3,自引:0,他引:3
采用生物大分子壳聚糖的凝胶系统,进行了凝胶注模成型氧化铝瓷的研究。傅立叶变换红外光谱(FT—IR)分析表明,在稀醋酸中壳聚糖和戊二醛通过亚胺键交联反应可以形成较高强度的凝胶体,加入氧化铝并不破坏胶体的结构。同时研究探讨了醋酸、壳聚糖、戊二醛含量及Al2O3粉末固相体积分数和反应温度等对凝胶固化反应时间的影响因素。通过改变影响因素有效的控制了凝胶反应时间,最终实现理想的注模成型工艺。 相似文献