Shaping ceramics through indirect selective laser sintering
Shaping ceramics through indirect selective laser sintering
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DOI：
10.1108/rpj-10-2014-0143
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发表时间：
2016-01-01
影响因子：
3.9
通讯作者：
Kruth, Jean-Pierre
中科院分区：
文献类型：
--
作者：
Deckers, Jan Patrick;Shahzad, Khuram;Kruth, Jean-Pierre
目的 - 本文的目的是比较通过增材制造 (AM) 生产陶瓷零件的不同粉末冶金 (PM) 工艺。这创造了以几乎无限的形状自由度快速成型陶瓷零件的潜力。本文生产了氧化铝 (Al2O3) 零件，因为 Al2O3 是目前技术应用中最常用的陶瓷材料。设计/方法/途径 - 探索以下 PM 路线的变体，以间接选择性激光烧结（间接 SLS）作为 AM 成形步骤，以生产陶瓷零件：粉末合成、间接 SLS、粘合剂去除和熔炉烧结以及替代致密化步骤。研究结果 - 自由形状 Al2O3 零件获得的密度高达约 90%。 研究限制/影响 - 所得 Al2O3 零件含有团聚体间的孔隙。为了通过间接 SLS 生产更高质量的陶瓷零件，应该避免或消除这些孔隙。原创性/价值 - 该研究在很多方面都是创新的。首先，使用不同的粉末生产方法生产复合粉末，例如温度诱导相分离和分散聚合。其次，研究了四种不同的粘合剂材料：聚酰胺（尼龙-12）、聚苯乙烯、聚丙烯和巴西棕榈蜡-低密度聚乙烯组合。此外，为了生产密度更高的陶瓷零件，研究了以下致密化技术作为粉末冶金工艺的附加步骤：激光重熔、等静压和渗透。
Purpose - The purpose of this paper is to compare different powder metallurgy (PM) processes to produce ceramic parts through additive manufacturing (AM). This creates the potential to rapidly shape ceramic parts with an almost unlimited shape freedom. In this paper, alumina (Al2O3) parts are produced, as Al2O3 is currently the most commonly used ceramic material for technical applications.Design/methodology/approach - Variants of the following PM route, with indirect selective laser sintering (indirect SLS) as the AM shaping step, are explored to produce ceramic parts: powder synthesis, indirect SLS, binder removal and furnace sintering and alternative densification steps.Findings - Freeform-shaped Al2O3 parts with densities up to approximately 90 per cent are obtained.Research limitations/implications - The resulting Al2O3 parts contain inter-agglomerate pores. To produce higher-quality ceramic parts through indirect SLS, these pores should be avoided or eliminated.Originality/value - The research is innovative in many ways. First, composite powders are produced using different powder production methods, such as temperature-induced phase separation and dispersion polymerization. Second, four different binder materials are investigated: polyamide (nylon-12), polystyrene, polypropylene and a carnauba wax-low-density polyethylene combination. Further, to produce ceramic parts with increased density, the following densification techniques are investigated as additional steps of the PM process: laser remelting, isostatic pressing and infiltration.