It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) c...It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) composites. Initially, GNPs were combined with YSZ through nanoparticle regranulation technology to obtain uniformly dispersed powders. Subsequently, the prepared powders were sintered by Spark Plasma Sintering(SPS). Systematic investigation was carried out to examine how GNPs regulate the phase, microstructures, and nanomechanical properties of GNPs/YSZ composite ceramics with different sintering temperatures.Results show that the GNPs can inhibit the coalescence of adjacent grains in YSZ ceramics. Herein,we propose that the intensity ratio of 2D peak to G peak of GNPs in Raman spectrum serves as a key indicator to assess the nanomechanical properties of GNPs/YSZ composites. When the intensity ratio of 2D peak to G peak is 0.5–0.6, the GNPs/YSZ composites obtained in the sintering temperature range of 1 200–1 250.C exhibit excellent nanomechanical properties such as hardness,elastic modulus, wear and creep resistance.展开更多
The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves t...The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves that there is a positive order relative relationship between the two indicators. In the meantime, the author also establishes the indicator ρ which can show comprehensively the economic power and welfare of each country and thereby indicates the characteristics of exchange rate and living level of each country.展开更多
基金supported from the National Natural Science Foundation of China(No.52371062)the Open Foundation from National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environments,China,the National Key Research and Development Program of China(No.2020YFB2007900)the National Major Science and Technology Projects of China(No.2017-VI-0020-0093).
文摘It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) composites. Initially, GNPs were combined with YSZ through nanoparticle regranulation technology to obtain uniformly dispersed powders. Subsequently, the prepared powders were sintered by Spark Plasma Sintering(SPS). Systematic investigation was carried out to examine how GNPs regulate the phase, microstructures, and nanomechanical properties of GNPs/YSZ composite ceramics with different sintering temperatures.Results show that the GNPs can inhibit the coalescence of adjacent grains in YSZ ceramics. Herein,we propose that the intensity ratio of 2D peak to G peak of GNPs in Raman spectrum serves as a key indicator to assess the nanomechanical properties of GNPs/YSZ composites. When the intensity ratio of 2D peak to G peak is 0.5–0.6, the GNPs/YSZ composites obtained in the sintering temperature range of 1 200–1 250.C exhibit excellent nanomechanical properties such as hardness,elastic modulus, wear and creep resistance.
文摘The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves that there is a positive order relative relationship between the two indicators. In the meantime, the author also establishes the indicator ρ which can show comprehensively the economic power and welfare of each country and thereby indicates the characteristics of exchange rate and living level of each country.
