Natural rubber latex as a new binder for slip casting of alumina ceramics

IF 1.2 4区化学 Q4 POLYMER SCIENCE Journal of Rubber Research Pub Date : 2023-07-06 DOI:10.1007/s42464-023-00208-4

P. P. Rakesh Krishnan, P. Arun Kumar, K. Prabhakaran

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Abstract

The slip casting of ceramics uses synthetically prepared water-soluble polymers and polymer emulsions as binder to achieve adequate yield stress of the consolidated body and high green strength. Substitution of synthetically prepared binders with a naturally renewable one is highly recommended for environmental friendliness and sustainability. Herein, slip casting of aqueous alumina slurries using natural rubber latex (NRL) binder is studied for the first time. Slurries of high alumina loading (40–55 vol%) at rubber concentrations in the range of 2–8 wt% obtained by mixing a concentrated aqueous alumina powder dispersion and a concentrated NRL exhibit viscosity and yield stress suitable for slip casting. The thickness of the body produced in 1 h from the slurries containing the NRL binder by slip casting in a plaster of Paris mold is three times higher than that produced from a slurry prepared using 2 wt% polyvinyl alcohol (PVA) binder. The slip-cast green bodies after annealing at 200 °C show high strength (3–9.68 MPa) due to cross-linking of rubber. Sintered ceramics prepared from the slip-cast bodies exhibit ~ 97% theoretical density (T.D) with an average grain size of 1.8 μm. NRL binder-based slip casting is capable of producing sintered alumina crucibles of wall thickness as low as 1.2 mm. NRL can be an eco-friendly and sustainable candidate binder for the slip casting of ceramic materials.

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天然胶乳作为一种新型的氧化铝陶瓷流延粘结剂

陶瓷的滑动铸造使用合成的水溶性聚合物和聚合物乳液作为粘合剂，以实现固结体的足够屈服应力和高生坯强度。为了环境友好和可持续性，强烈建议用天然可再生的粘合剂代替合成的粘合剂。本文首次研究了使用天然橡胶胶乳（NRL）粘结剂的水性氧化铝浆料的滑移铸造。通过混合浓缩氧化铝水性粉末分散体和浓缩NRL获得的橡胶浓度在2–8 wt%范围内的高氧化铝负载量（40–55 vol%）的浆料表现出适用于滑动铸造的粘度和屈服应力。由含有NRL粘合剂的浆料在1小时内通过在巴黎石膏模具中的滑动铸造生产的本体的厚度是由使用2wt%聚乙烯醇（PVA）粘合剂制备的浆料生产的本体厚度的三倍。由于橡胶的交联，在200°C退火后的滑移铸造生坯显示出高强度（3–9.68 MPa）。由滑移铸造体制备的烧结陶瓷显示 ~ 97%的理论密度（T.D），平均晶粒尺寸为1.8μm。基于NRL粘结剂的滑动铸造能够生产壁厚低至1.2 mm的烧结氧化铝坩埚。NRL可以是一种环保和可持续的陶瓷材料滑动铸造候选粘结剂。

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来源期刊

Journal of Rubber Research 化学-高分子科学

自引率

15.40%

发文量

审稿时长

3 months

期刊介绍： The Journal of Rubber Research is devoted to both natural and synthetic rubbers, as well as to related disciplines. The scope of the journal encompasses all aspects of rubber from the core disciplines of biology, physics and chemistry, as well as economics. As a specialised field, rubber science includes within its niche a vast potential of innovative and value-added research areas yet to be explored. This peer reviewed publication focuses on the results of active experimental research and authoritative reviews on all aspects of rubber science. The Journal of Rubber Research welcomes research on: the upstream, including crop management, crop improvement and protection, and biotechnology; the midstream, including processing and effluent management; the downstream, including rubber engineering and product design, advanced rubber technology, latex science and technology, and chemistry and materials exploratory; economics, including the economics of rubber production, consumption, and market analysis. The Journal of Rubber Research serves to build a collective knowledge base while communicating information and validating the quality of research within the discipline, and bringing together work from experts in rubber science and related disciplines. Scientists in both academia and industry involved in researching and working with all aspects of rubber will find this journal to be both source of information and a gateway for their own publications.