部分稳定氧化锆(Partially stabilized zirconia,PSZ)陶瓷因其优越的性能在航空航天工业等领域有广泛的应用。表面粗糙度是评价PSZ陶瓷磨削加工水平的关键指标,为了降低磨削表面粗糙度的预测误差,提出了一种基于相关性分析与卷积-双向...部分稳定氧化锆(Partially stabilized zirconia,PSZ)陶瓷因其优越的性能在航空航天工业等领域有广泛的应用。表面粗糙度是评价PSZ陶瓷磨削加工水平的关键指标,为了降低磨削表面粗糙度的预测误差,提出了一种基于相关性分析与卷积-双向长短期记忆神经网络(Convolution-bidirectional long short term memory neural network,CNN-BiLSTM)的PSZ陶瓷磨削表面粗糙度声发射预测模型。通过分析磨削声发射信号特征值与磨削表面粗糙度值之间相关性,筛选出磨削声发射信号与磨削表面粗糙度之间的最相关频段和特征矩阵,作为CNN-BiLSTM神经网络的输入参数以降低磨削表面粗糙度声发射预测的误差。研究结果表明,基于相关性分析与CNN-BiLSTM神经网络的PSZ陶瓷磨削表面粗糙度的平均预测误差低于3.92%。展开更多
The fracture toughness of MgO partially stabilized zirconia(MgO-PSZ) has been mea-sured by the hardness indentation method.The influences of heat treatment on the fracture toughness K1c of MgO-PSZ were studied,It was ...The fracture toughness of MgO partially stabilized zirconia(MgO-PSZ) has been mea-sured by the hardness indentation method.The influences of heat treatment on the fracture toughness K1c of MgO-PSZ were studied,It was found that the fracture toughness of MgO-PSZ can be greatly changed by different heat treatment profile.The fracture toughness was improved by the heat treatment at 1100℃ after aging at 1400℃ ,There was the greatest K1c value(11.30 MPa.m^1/2) of the samples aged at 1400℃ for 2 h followed by a subse-quent anneal at 1100℃ for 10 h.The changes in the microstructure of MgO-PSZ ceramics aged with different thermal treatment were studiedd by use of transmission electron microscopy.展开更多
文摘部分稳定氧化锆(Partially stabilized zirconia,PSZ)陶瓷因其优越的性能在航空航天工业等领域有广泛的应用。表面粗糙度是评价PSZ陶瓷磨削加工水平的关键指标,为了降低磨削表面粗糙度的预测误差,提出了一种基于相关性分析与卷积-双向长短期记忆神经网络(Convolution-bidirectional long short term memory neural network,CNN-BiLSTM)的PSZ陶瓷磨削表面粗糙度声发射预测模型。通过分析磨削声发射信号特征值与磨削表面粗糙度值之间相关性,筛选出磨削声发射信号与磨削表面粗糙度之间的最相关频段和特征矩阵,作为CNN-BiLSTM神经网络的输入参数以降低磨削表面粗糙度声发射预测的误差。研究结果表明,基于相关性分析与CNN-BiLSTM神经网络的PSZ陶瓷磨削表面粗糙度的平均预测误差低于3.92%。
文摘The fracture toughness of MgO partially stabilized zirconia(MgO-PSZ) has been mea-sured by the hardness indentation method.The influences of heat treatment on the fracture toughness K1c of MgO-PSZ were studied,It was found that the fracture toughness of MgO-PSZ can be greatly changed by different heat treatment profile.The fracture toughness was improved by the heat treatment at 1100℃ after aging at 1400℃ ,There was the greatest K1c value(11.30 MPa.m^1/2) of the samples aged at 1400℃ for 2 h followed by a subse-quent anneal at 1100℃ for 10 h.The changes in the microstructure of MgO-PSZ ceramics aged with different thermal treatment were studiedd by use of transmission electron microscopy.