空心叶片用氧化铝基陶瓷型芯性能改进研究
发布时间：2018-07-27 19:00
【摘要】：高性能发动机的研发,促进了陶瓷型芯的发展。氧化铝陶瓷型芯具有很好的高温性能,特别适合应用于精密定向铸造中。但氧化铝脱芯困难,对生产效率的提高非常不利。如何在保持型芯其他良好性能的前提下提高脱芯性能至关重要。本文将主要从基体材料的选择、基体材料的粒度配合、矿化剂的添加以及终烧制度的确定等方面进行研究,确定最佳配方和工艺。相应测定的性能主要有室温抗弯强度、高温挠度、开气孔率,体积密度、吸水率、收缩率、烧损率和脱芯效率。陶瓷型芯综合性能的均衡优化非常关键,在基体材料的选择试验中,随莫来石含量的增加,各个性能产生很大变化,对比所有试样的各项实验结果,当莫来石含量为15%时综合性能相对较好。在此配方的基础上进行了基体材料粒度配合对性能影响的研究,经过粒度配合后的型芯性能得到进一步改善。在保持型芯其他良好性能的前提下为了提高脱芯性能,又分别对作为矿化剂的莫来石和石英粉进行了实验探究,主要分析矿化剂添加量的梯度变化对性能的影响,从中得出(终烧温度为1350℃)石英粉含量为10%时的L-4型配方型芯综合性能最佳:抗弯强度为26.45MPa;挠度值为1.37mm;收缩率为0.58%;开气孔率为47.78%;经过180min浓度为60%沸腾强碱液处理,损失的质量百分数达到96.21%。在提高脱芯性能的同时,其他各项性能也得到了很好的保持。在最佳配方L-4的基础上对其终烧温度进行了研究。对比1350℃、1450℃和1550℃三种不同最终保温温度所得型芯的各项性能,最终保温温度在1350℃时L-4型配方型芯综合性能最佳。对型芯L-4进行高温强化处理后,在1550℃下保温30min测定其挠度值,其数值下降为0.23mm,高温挠度得到改善。
[Abstract]:The development of high performance engine promotes the development of ceramic core. Alumina ceramic core has good high temperature performance, especially suitable for precision directional casting. However, it is difficult to core alumina, which is unfavorable to the improvement of production efficiency. It is very important to improve the core removal performance on the premise of other good performance of retaining core. In this paper, the selection of matrix material, the particle size matching of matrix material, the addition of mineralizer and the determination of final firing system are studied to determine the optimum formulation and process. The main properties measured include room temperature bending strength, high temperature deflection, open porosity, bulk density, water absorption, shrinkage, burn loss and core removal efficiency. It is very important to balance and optimize the comprehensive properties of ceramic core. In the selection test of matrix material, with the increase of mullite content, the properties vary greatly. When mullite content is 15, the comprehensive performance is relatively good. On the basis of this formula, the effect of particle size matching on the properties of matrix materials was studied, and the core properties were further improved after particle size matching. In order to improve the core demineralization performance, mullite and quartz powder, which are mineralizers, were studied respectively in order to improve the core performance. The influence of the gradients of mineralizers on the properties was analyzed. The L-4 formula core with 10 quartz powder content (final firing temperature 1350 鈩，
本文编号：2148842
[Abstract]:The development of high performance engine promotes the development of ceramic core. Alumina ceramic core has good high temperature performance, especially suitable for precision directional casting. However, it is difficult to core alumina, which is unfavorable to the improvement of production efficiency. It is very important to improve the core removal performance on the premise of other good performance of retaining core. In this paper, the selection of matrix material, the particle size matching of matrix material, the addition of mineralizer and the determination of final firing system are studied to determine the optimum formulation and process. The main properties measured include room temperature bending strength, high temperature deflection, open porosity, bulk density, water absorption, shrinkage, burn loss and core removal efficiency. It is very important to balance and optimize the comprehensive properties of ceramic core. In the selection test of matrix material, with the increase of mullite content, the properties vary greatly. When mullite content is 15, the comprehensive performance is relatively good. On the basis of this formula, the effect of particle size matching on the properties of matrix materials was studied, and the core properties were further improved after particle size matching. In order to improve the core demineralization performance, mullite and quartz powder, which are mineralizers, were studied respectively in order to improve the core performance. The influence of the gradients of mineralizers on the properties was analyzed. The L-4 formula core with 10 quartz powder content (final firing temperature 1350 鈩，
本文编号：2148842
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