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Design and fabrication of laminated–graded zirconia self-lubricating composites
Graphical abstract High-performance self-lubricated ceramic composites are regarded as potential candidates for space applications. This paper proposes a new design for zirconia ceramic self-lubricating composites in order to overcome the conflict between their mechanical and tribological properties. A new design method to achieve the integration of structure and lubricating function in ceramic was proposed by combining the functionally graded material (FGM) concept with the bionic design of ZrO2(3Y) ceramic. ZrO2(3Y)–Al2O3/ZrO2(3Y)/solid lubricant (SL) FGMs were prepared, and gradient exponent p was defined to determine the distribution of SL in the materials. The mechanical and tribological properties of the composites under different p were studied. ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance at the temperature range from 25 to 800°C, and the bending strength is four times higher than that of monolithic ZrO2(3Y)/SL composites when p=2. The variation of p causes the change of the residual tensile stress generated from the thermal mismatch, and further influences the mechanical property of the materials. Display Omitted Highlights ► A new design method to achieve the integration of structure and lubricating function in ceramic was proposed. ► The concept of functionally graded material (FGM) and the bionic design of ceramic were combined. ► Gradient exponent p was defined to determine the distribution of solid lubricant (SL) in the materials. ► ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance at extremely wide operating temperature range. ► The bending strength of the prepared FGM is four times higher than that of conventional ZrO2(3Y)/SL composites when p=2.
Abstract A new design method to achieve the integration of structure and lubricating function in ceramic was proposed by combining the functionally graded material (FGM) concept with the bionic design of ZrO2(3Y) ceramic. ZrO2(3Y)–Al2O3/ZrO2(3Y)/solid lubricant (SL) FGMs were prepared, and gradient exponent p was defined to determine the distribution of SL in the materials. The mechanical and tribological properties of the composites with different p were studied. ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance over a broad temperature from room temperature to 800°C, and the bending strength of the sample with the p of 2 is four times higher than that of monolithic ZrO2(3Y)/SL composites. The variation of p causes the change in the residual tensile stress generated from the thermal mismatch, and further influences the mechanical property of the materials.
Design and fabrication of laminated–graded zirconia self-lubricating composites
Graphical abstract High-performance self-lubricated ceramic composites are regarded as potential candidates for space applications. This paper proposes a new design for zirconia ceramic self-lubricating composites in order to overcome the conflict between their mechanical and tribological properties. A new design method to achieve the integration of structure and lubricating function in ceramic was proposed by combining the functionally graded material (FGM) concept with the bionic design of ZrO2(3Y) ceramic. ZrO2(3Y)–Al2O3/ZrO2(3Y)/solid lubricant (SL) FGMs were prepared, and gradient exponent p was defined to determine the distribution of SL in the materials. The mechanical and tribological properties of the composites under different p were studied. ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance at the temperature range from 25 to 800°C, and the bending strength is four times higher than that of monolithic ZrO2(3Y)/SL composites when p=2. The variation of p causes the change of the residual tensile stress generated from the thermal mismatch, and further influences the mechanical property of the materials. Display Omitted Highlights ► A new design method to achieve the integration of structure and lubricating function in ceramic was proposed. ► The concept of functionally graded material (FGM) and the bionic design of ceramic were combined. ► Gradient exponent p was defined to determine the distribution of solid lubricant (SL) in the materials. ► ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance at extremely wide operating temperature range. ► The bending strength of the prepared FGM is four times higher than that of conventional ZrO2(3Y)/SL composites when p=2.
Abstract A new design method to achieve the integration of structure and lubricating function in ceramic was proposed by combining the functionally graded material (FGM) concept with the bionic design of ZrO2(3Y) ceramic. ZrO2(3Y)–Al2O3/ZrO2(3Y)/solid lubricant (SL) FGMs were prepared, and gradient exponent p was defined to determine the distribution of SL in the materials. The mechanical and tribological properties of the composites with different p were studied. ZrO2(3Y)–Al2O3/ZrO2(3Y)/SL FGM shows excellent self-lubricating performance over a broad temperature from room temperature to 800°C, and the bending strength of the sample with the p of 2 is four times higher than that of monolithic ZrO2(3Y)/SL composites. The variation of p causes the change in the residual tensile stress generated from the thermal mismatch, and further influences the mechanical property of the materials.
Design and fabrication of laminated–graded zirconia self-lubricating composites
Fang, Yuan (author) / Zhang, Yongsheng (author) / Song, Junjie (author) / Fan, Hengzhong (author) / Hu, Litian (author)
2013-01-18
5 pages
Article (Journal)
Electronic Resource
English
Design and fabrication of laminated-graded zirconia self-lubricating composites
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