The microstructure, phase consistence and microhardness of thermal sprayed coatings were investigated. The tungsten and chromium carbide coatings and also composite NiCrSiB coating were analyzed. The microstructure of...The microstructure, phase consistence and microhardness of thermal sprayed coatings were investigated. The tungsten and chromium carbide coatings and also composite NiCrSiB coating were analyzed. The microstructure of coatings were observed by using optical microscopy (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Almost equiaxial carbide particles settled inside the surrounded material of coating were found. The cracks propagating thorough the particles and along boundaries between the particles and surrounded material were observed. This phenomenon was connected with the porosity of coatings. The decarburization process was detected in coatings by phase composition investigation using X-ray method. The decarburization process was the reason due to which beside initial Cr3C2 the Cr7C3 and Cr23C6 particles were found. In the tungsten coatings beside the initial WC carbides the W2Cones were found.展开更多
采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧...采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧化动力学曲线,对涂层的热震性能进行分析。结果表明,喷涂Al_2O_3陶瓷料浆能有效填补Ni Cr Al Y喷涂层产生的裂纹,涂层与金属基体之间呈冶金结合,α-Al_2O_3和金红石型Ti O_2是陶瓷涂层耐高温的主体晶相结构。2~#涂层表现出最佳的抗高温氧化性能和抗热震性能。展开更多
To screen new biological formulations, accurate and efficient application technology, field test was conducted with 72% Bacillus thuringiensis(Bt)·monosultap WP, 8% lambda-cyhalothrin·emamectin benzoate SA a...To screen new biological formulations, accurate and efficient application technology, field test was conducted with 72% Bacillus thuringiensis(Bt)·monosultap WP, 8% lambda-cyhalothrin·emamectin benzoate SA and 3.6% lambda-cyhalothrin·Bt SA through manual spraying and unmanned aerial vehicle spraying. Test results and comprehensive evaluation analysis demonstrated that 72% Bt·monosultap WP and 8%lambda-cyhalothrin·emamectin benzoate SA by manual spraying and unmanned aerial vehicle spraying had good prevention and control effect on strains and internodes damaged by Tryporyza intacta Snellen in middle and late stage, which were ideal new biological formulations with high effi-ciency and low risk for prevention and control of T. intacta in middle and late stage, and could be popularized in sugarcane area. 72% Bt·monosultap WP at the dose of 3 000 g/hectare and 8% lambda-cyhalothrin·emamectin benzoate SA at the dose of 750 mL/hectare could be sprayed in mid September at the peak occurrence period of the forth and fifth generations of T. intacta and Proceras venosatus. Agents were diluted with 900 kg water per hectare, and manually sprayed with electric knapsack sprayer; or agents were diluted with 15 kg of Haoyang aerial control special addi-tives and water per hectare, and sprayed with unmanned aerial vehicle. The control effect against borer-damaged strain rate was above 81.3% and that against borer-damaged internode rate was above 88.6%.展开更多
基金financially supported by polish project NR15 0001 06the Ministry of Higher Education and Science/AGH University of Science and Technology,Krakow,Poland,grant number 11.11.180.255 is greatly acknowledged.
文摘The microstructure, phase consistence and microhardness of thermal sprayed coatings were investigated. The tungsten and chromium carbide coatings and also composite NiCrSiB coating were analyzed. The microstructure of coatings were observed by using optical microscopy (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Almost equiaxial carbide particles settled inside the surrounded material of coating were found. The cracks propagating thorough the particles and along boundaries between the particles and surrounded material were observed. This phenomenon was connected with the porosity of coatings. The decarburization process was detected in coatings by phase composition investigation using X-ray method. The decarburization process was the reason due to which beside initial Cr3C2 the Cr7C3 and Cr23C6 particles were found. In the tungsten coatings beside the initial WC carbides the W2Cones were found.
文摘采用热化学反应喷涂法在304不锈钢基体表面制备了Al_2O_3非梯度陶瓷涂层(记为1~#涂层)和Ni Cr Al Y/Al_2O_3梯度陶瓷涂层(记为2~#涂层),使用扫描电镜(SEM)、X射线衍射仪(XRD)对该涂层的微观形貌、物相变化进行表征;描述了涂层的高温氧化动力学曲线,对涂层的热震性能进行分析。结果表明,喷涂Al_2O_3陶瓷料浆能有效填补Ni Cr Al Y喷涂层产生的裂纹,涂层与金属基体之间呈冶金结合,α-Al_2O_3和金红石型Ti O_2是陶瓷涂层耐高温的主体晶相结构。2~#涂层表现出最佳的抗高温氧化性能和抗热震性能。
基金Supported by Special Fund of China Agricultural (Sugar) Industry Research System(CARS-170303)Training Project of Yunling Industry and Technology Leading Talents "Control of Sugarcane Harm-ful Organisms"(2018LJRC56)Special Fund of Agricultural Industry Research System in Yunnan Province
文摘To screen new biological formulations, accurate and efficient application technology, field test was conducted with 72% Bacillus thuringiensis(Bt)·monosultap WP, 8% lambda-cyhalothrin·emamectin benzoate SA and 3.6% lambda-cyhalothrin·Bt SA through manual spraying and unmanned aerial vehicle spraying. Test results and comprehensive evaluation analysis demonstrated that 72% Bt·monosultap WP and 8%lambda-cyhalothrin·emamectin benzoate SA by manual spraying and unmanned aerial vehicle spraying had good prevention and control effect on strains and internodes damaged by Tryporyza intacta Snellen in middle and late stage, which were ideal new biological formulations with high effi-ciency and low risk for prevention and control of T. intacta in middle and late stage, and could be popularized in sugarcane area. 72% Bt·monosultap WP at the dose of 3 000 g/hectare and 8% lambda-cyhalothrin·emamectin benzoate SA at the dose of 750 mL/hectare could be sprayed in mid September at the peak occurrence period of the forth and fifth generations of T. intacta and Proceras venosatus. Agents were diluted with 900 kg water per hectare, and manually sprayed with electric knapsack sprayer; or agents were diluted with 15 kg of Haoyang aerial control special addi-tives and water per hectare, and sprayed with unmanned aerial vehicle. The control effect against borer-damaged strain rate was above 81.3% and that against borer-damaged internode rate was above 88.6%.
