Effect of anion nature and precipitation pH value on size and morphology of partially stabilized zirconium dioxide particles

2020 ◽  
Author(s):  
Anastasiya S. Kosykh ◽  
Sergei V. Buinachev ◽  
Maxim A. Mashkovtsev ◽  
Nina V. Zhirenkina
Keyword(s):  
Zirconium Dioxide ◽  
Ph Value ◽  
Precipitation Ph ◽  
Size And Morphology ◽  
Stabilized Zirconium Dioxide

Properties of the partially stabilized zirconium dioxide crystals

Refractories ◽  
1988 ◽  
Vol 29 (5-6) ◽  
pp. 333-335
Author(s):  
K. K. Strelov ◽  
V. G. Peichev ◽  
S. Yu. Pliner ◽  
Yu. I. Komolikov ◽  
M. V. Sofronov ◽  
...  
Keyword(s):  
Zirconium Dioxide ◽  
Stabilized Zirconium Dioxide

Nano-Structured Crystals of Zirconium Dioxide for Extreme Applications

2020 ◽  
Vol 839 ◽  
pp. 1-6
Author(s):  
Valeriy V. Alisin ◽  
Mihail N. Roshchin
Keyword(s):  
Zirconium Dioxide ◽  
High Speed ◽  
Nuclear Power ◽  
Chemical Engineering ◽  
Normal Operation ◽  
Electron Microscopic ◽  
Element Analysis ◽  
Axial Compressors ◽  
Friction Surfaces ◽  
Stabilized Zirconium Dioxide

The paper discusses application possibilities of nanostructured crystals of partly stabilized zirconium dioxide in greaseless running of plain bearings in order to support normal operation of friction joints at high temperatures and in aggressive conditions. This issue is a burning one in different industries, e.g. circulating pumps in nuclear power engineering, mixing units of crystal synthesizing lines in chemical engineering; motors in space-based targets, rotors of guide blades in axial compressors of airplane engines, supports of high-speed gas centrifuges. Micro-hardness was investigated, and friction surfaces were explored using methods of X-ray, electron-microscopic and element analysis to find a wear mechanism for crystals ZrO2- Y2O3. The paper reports on tribological properties of partly stabilized zirconium dioxide crystals and prospects of their industrial usage.

scholarly journals The precipitation chemistry and acidity over China during 2018

2019 ◽  
Vol 136 ◽  
pp. 06020 ◽  
Author(s):  
Xiaofang Jia ◽  
Jie Tang ◽  
Yong Zhang
Keyword(s):  
Acid Rain ◽  
Ph Value ◽  
Southern China ◽  
Eastern China ◽  
Precipitation Chemistry ◽  
Hunan Province ◽  
Observation Data ◽  
Rain Area ◽  
Chemistry Data ◽  
Precipitation Ph

This paper reports the acid rain observation data from 376 Acid Rain Monitoring stations and the precipitation chemistry data from 5 Global Atmosphere Watch stations of China Meteorological Administration(CMA) during 2018. The variation characteristics of acid rain in China and that of precipitation chemistry in Eastern China are discussed. The results show that the acid rain area in China is mainly distributed in the Southeast and South of China and dispersively in North and Southwest of China. Heavy acid rain area is only limited in Eastern part of Hunan province. The annual mean precipitation pH value of all stations in 2018 ranges from 3.73 to 8.07 and the national annual mean precipitation pH value is 5.94, which is higher than those of 2010-2017. The national annual mean precipitation conductivity is 47.7 μS·cm-1 with the higher conductivity in Northern China and lower in Southern China. Compared with 2010-2017, the acid rain pollution situation over China has been improving nationwide. The precipitation chemistry data shows that the concentration of sulfate is close to nitrate in precipitation and keeps decreasing in recent years.

The role of Lewis acidic centers in stabilized zirconium dioxide

2003 ◽  
Vol 249 (2) ◽  
pp. 313-326 ◽  
Author(s):  
Helena Teterycz ◽  
Roman Klimkiewicz ◽  
Marek Łaniecki
Keyword(s):  
Zirconium Dioxide ◽  
Stabilized Zirconium Dioxide

scholarly journals Analysis on Change of Precipitation pH and Chemical Characteristics of Acid Rain in Liaoning Province (2007�2018)

2020 ◽  
Vol 71 (5) ◽  
pp. 491-505
Author(s):  
Zhou De-Ping ◽  
Wang Yan ◽  
Xie Yan-Bin ◽  
Wang Xiao-Ying ◽  
Wang Yang-Feng ◽  
...  
Keyword(s):  
Acid Rain ◽  
Environmental Control ◽  
Ph Value ◽  
Weak Acid ◽  
Control Measures ◽  
Liaoning Province ◽  
Rain Area ◽  
Prone Area ◽  
Fundamental Reason ◽  
Precipitation Ph

Acid rain, as one of the outputs of toxic and harmful chemicals from factories, is a serious environmental problem, especially in China, which has harmful ecological consequences and has a direct impact on vegetation and human health. Based on the data of acid rain observation station of Liaoning Meteorological Bureau from 2007 to 2018, the variation of precipitation pH and the distribution of acid rain in Liaoning Province in the past 12 years were analyzed. The result shows: First, the average pH value of annual precipitation in Liaoning Province is 5.55, which belongs to weak acid rain area. The frequency of acid rain is 12.56%, and the ratio of acid rain to total precipitation is 15.48%. More than 1/5 of the stations are located in the acid rain prone area, among which Dalian and Dandong are seriously polluted, being close to the grade of acid rain frequent area. Second, from 2007 to 2018, the precipitation pH in Liaoning Province fluctuated and increased year by year, with an average annual increase of 0.077 pH, and the pollution of acid rain decreased year by year; especially after 2014, Liaoning Province has exited from weak acid rain area, with its precipitation pH tending to be neutral year by year. Third, acid rain pollution in Liaoning Province is most serious in winter, followed by autumn and summer; in the first six years (2007-2012), the pollution in February was the most serious, and in the last six years (2013-2018), the pollution in December was the most serious, which was significantly worse than the previous six years. Fourth, more efforts have been made to control air pollution in all parts of the country, and the annual decrease in acid precursor emissions is the fundamental reason for the variation of precipitation pH and the improvement of acid rain pollution in Liaoning Province, while the precipitation pH and acid rain distribution in Liaoning Province are sensitive to the relevant environmental control measures taken by the state in recent years. However, the change of acid rain pollution reminds us to attach great importance to new pollution components and causes.

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