{"title":"Microdischarges in processes of electrochemical microplasma synthesis of composite materials","authors":"O.P. Terleeva, V. I. Belevantsev, A. Slonova","doi":"10.1109/KORUS.1999.876244","DOIUrl":null,"url":null,"abstract":"Basing on reliable conceptions concerning stage sequence of electrochemical microplasma processes there were considered and summarized data about characteristics of single microdischarges and their sets. The way of estimation of characteristics of separate discharges within smaller sets was proposed. Protective coatings (composite materials), formed in processes of electrochemical microplasma synthesis, possess high. wear-, thermo-, erosionresistance and may be used for equipment protection in oil & gas extracting industry, machinery construction, textile industry and other. Emphasize on the search for practically perspective methods has led to a lag in elaborating of fundamental aspects. All these processes are realized under very high polarizations, it means, under conditions, far from equillibriwn even locally. Substantial role both in mass-transfer and creating useful properties of synthesized materials (coatings, films) is played by microdischarges and their sets, emerging at controlling parameters reaching undefined levels. Here we attempted to outline the opportunities gained and means of characterization of microdischerges and their sets. The term 'microplasma processes' means only the small sizes of discharges and presence of plasma component inside. Within this collective notion their are pointed out anodic and anodiccathodic spark, microark and ark processes. The common feature of the variety of processes is a stage sequence consequent realization of specific discharges sets and conjugate processes. Fig. 1. (a) shows voltage chronogram for anodic process. Sections II and I11 account for domination of spark and microark disharges accordingly, and small border area of 'rounded break' for their coexistance. In anodic-cathodic processes the coexistance of discharges lasts for a long time (section 2,3, fig. 1. b)) and one can highlight chronogram sections, dealing with sharp domination of one type of discharges (section 3\", fig. 1. c)) only using special current modes. Highlighting voltage chronogram sections, corresponding with certain type of discharges, helped to explain a negative slope of the 'formation curve' (chronogram) section (fig. 1. c), section 3\"). Information on stage sequence may be that foundation, on which the study of microdischarges and their sets may be based in connection with information on characteristics of formed and/or modified by them substantial-structure complexes, This connection is often not taken into account in a well-known to us literature on researches of microdischarges. Studies of effective characteristics of single microdischarges (as medium-statistic ideals within their specific sets) and studies of specific single discharges parameters (including within smaller sets) are perspective. The analytical expressions for definition of the effective characteristics of single microdischarges are given below:","PeriodicalId":250552,"journal":{"name":"Proceedings Third Russian-Korean International Symposium on Science and Technology. KORUS'99 (Cat. No.99EX362)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1999-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings Third Russian-Korean International Symposium on Science and Technology. KORUS'99 (Cat. No.99EX362)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/KORUS.1999.876244","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Basing on reliable conceptions concerning stage sequence of electrochemical microplasma processes there were considered and summarized data about characteristics of single microdischarges and their sets. The way of estimation of characteristics of separate discharges within smaller sets was proposed. Protective coatings (composite materials), formed in processes of electrochemical microplasma synthesis, possess high. wear-, thermo-, erosionresistance and may be used for equipment protection in oil & gas extracting industry, machinery construction, textile industry and other. Emphasize on the search for practically perspective methods has led to a lag in elaborating of fundamental aspects. All these processes are realized under very high polarizations, it means, under conditions, far from equillibriwn even locally. Substantial role both in mass-transfer and creating useful properties of synthesized materials (coatings, films) is played by microdischarges and their sets, emerging at controlling parameters reaching undefined levels. Here we attempted to outline the opportunities gained and means of characterization of microdischerges and their sets. The term 'microplasma processes' means only the small sizes of discharges and presence of plasma component inside. Within this collective notion their are pointed out anodic and anodiccathodic spark, microark and ark processes. The common feature of the variety of processes is a stage sequence consequent realization of specific discharges sets and conjugate processes. Fig. 1. (a) shows voltage chronogram for anodic process. Sections II and I11 account for domination of spark and microark disharges accordingly, and small border area of 'rounded break' for their coexistance. In anodic-cathodic processes the coexistance of discharges lasts for a long time (section 2,3, fig. 1. b)) and one can highlight chronogram sections, dealing with sharp domination of one type of discharges (section 3", fig. 1. c)) only using special current modes. Highlighting voltage chronogram sections, corresponding with certain type of discharges, helped to explain a negative slope of the 'formation curve' (chronogram) section (fig. 1. c), section 3"). Information on stage sequence may be that foundation, on which the study of microdischarges and their sets may be based in connection with information on characteristics of formed and/or modified by them substantial-structure complexes, This connection is often not taken into account in a well-known to us literature on researches of microdischarges. Studies of effective characteristics of single microdischarges (as medium-statistic ideals within their specific sets) and studies of specific single discharges parameters (including within smaller sets) are perspective. The analytical expressions for definition of the effective characteristics of single microdischarges are given below: