Substantiation of Technology for the Growth of Monocrystalline Leucosapphire from Technically Pure Corundum
One of the stages of the preparation of porous granular corundum prior to its use in an installation for the industrial production of monocrystalline sapphire (type NIKA-M60) is high-temperature vacuum cleaning. The characteristics of the cleaning process are evaluated with mathematical models based...
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| Veröffentlicht in: | High temperature 2021-03, Vol.59 (2-6), p.302-306 |
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| creator | Shkolnikov, E. I. Ivanov, P. P. |
| description | One of the stages of the preparation of porous granular corundum prior to its use in an installation for the industrial production of monocrystalline sapphire (type NIKA-M60) is high-temperature vacuum cleaning. The characteristics of the cleaning process are evaluated with mathematical models based on solid-state diffusion and Knudsen diffusion from porous particles and through a layer of porous particles. The solid-state diffusion of impurity atoms and the Knudsen flow of impurity vapors through the granule pores are described by analytical expressions with fitting coefficients identified with the use of numerical solutions. The model of the Knudsen flow through a layer of granular powder makes it possible to take into account blowing with a neutral gas (argon) in order to intensify the process. Cleaning times on the order of several hours were obtained in the presence of argon blowing at a flow rate of 10
–5
kg/(m
2
s). Based on the NIKA-M60 unit, the flow rate is 7 × 10
–7
kg/s or 2.5 g/h. |
| doi_str_mv | 10.1134/S0018151X21020115 |
| format | Article |
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–5
kg/(m
2
s). Based on the NIKA-M60 unit, the flow rate is 7 × 10
–7
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–5
kg/(m
2
s). Based on the NIKA-M60 unit, the flow rate is 7 × 10
–7
kg/s or 2.5 g/h.</description><subject>Argon blowing</subject><subject>Atoms and Molecules in Strong Fields</subject><subject>Blowing rate</subject><subject>Blowing time</subject><subject>Classical and Continuum Physics</subject><subject>Corundum</subject><subject>Diffusion layers</subject><subject>Flow velocity</subject><subject>Heat and Mass Transfer and Physical Gasdynamics</subject><subject>High temperature</subject><subject>Impurities</subject><subject>Industrial Chemistry/Chemical Engineering</subject><subject>Knudsen flow</subject><subject>Laser Matter Interaction</subject><subject>Materials Science</subject><subject>Mathematical models</subject><subject>Neutral gases</subject><subject>Physical Chemistry</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Sapphire</subject><subject>Solid state</subject><subject>Vacuum cleaning</subject><issn>0018-151X</issn><issn>1608-3156</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp1kF9LwzAUxYMoOKcfwLeAz9XctmmzRxm6CROFTfCtpOnt2tklNWmRfntTKvggPl045_zuP0Kugd0CRPHdljEQwOE9BBYyAH5CZpAwEUTAk1MyG-1g9M_JhXMHxhjnYTQjH9s-d53UXS272mhqSrpDVWnTmP1AS2NpVyFdWfPVVaP5bLRRdvBI09Qa6QZ7ZZxs26q2SEtrjhNfKx8Y6Gvv1aWxvS764yU5K2Xj8Oqnzsnb48NuuQ42L6un5f0mULAQXaBShUpCiHyRplHKi1T6bROV5pJhLDApRBGXXAgslCxlmkh_SpHnIS8w90I0JzdT39aazx5dlx1Mb7UfmYVJzDkTSRT7FEwpZY1zFsustfVR2iEDlo0_zf781DPhxDif1Xu0v53_h74BhNd7rw</recordid><startdate>20210301</startdate><enddate>20210301</enddate><creator>Shkolnikov, E. I.</creator><creator>Ivanov, P. P.</creator><general>Pleiades Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20210301</creationdate><title>Substantiation of Technology for the Growth of Monocrystalline Leucosapphire from Technically Pure Corundum</title><author>Shkolnikov, E. I. ; Ivanov, P. P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c198t-c7ceca12e5977375d7a0056c7ba0e48e6d8d4f588edcafa76a552dbb25debafa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Argon blowing</topic><topic>Atoms and Molecules in Strong Fields</topic><topic>Blowing rate</topic><topic>Blowing time</topic><topic>Classical and Continuum Physics</topic><topic>Corundum</topic><topic>Diffusion layers</topic><topic>Flow velocity</topic><topic>Heat and Mass Transfer and Physical Gasdynamics</topic><topic>High temperature</topic><topic>Impurities</topic><topic>Industrial Chemistry/Chemical Engineering</topic><topic>Knudsen flow</topic><topic>Laser Matter Interaction</topic><topic>Materials Science</topic><topic>Mathematical models</topic><topic>Neutral gases</topic><topic>Physical Chemistry</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Sapphire</topic><topic>Solid state</topic><topic>Vacuum cleaning</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shkolnikov, E. I.</creatorcontrib><creatorcontrib>Ivanov, P. P.</creatorcontrib><collection>CrossRef</collection><jtitle>High temperature</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shkolnikov, E. I.</au><au>Ivanov, P. P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Substantiation of Technology for the Growth of Monocrystalline Leucosapphire from Technically Pure Corundum</atitle><jtitle>High temperature</jtitle><stitle>High Temp</stitle><date>2021-03-01</date><risdate>2021</risdate><volume>59</volume><issue>2-6</issue><spage>302</spage><epage>306</epage><pages>302-306</pages><issn>0018-151X</issn><eissn>1608-3156</eissn><abstract>One of the stages of the preparation of porous granular corundum prior to its use in an installation for the industrial production of monocrystalline sapphire (type NIKA-M60) is high-temperature vacuum cleaning. The characteristics of the cleaning process are evaluated with mathematical models based on solid-state diffusion and Knudsen diffusion from porous particles and through a layer of porous particles. The solid-state diffusion of impurity atoms and the Knudsen flow of impurity vapors through the granule pores are described by analytical expressions with fitting coefficients identified with the use of numerical solutions. The model of the Knudsen flow through a layer of granular powder makes it possible to take into account blowing with a neutral gas (argon) in order to intensify the process. Cleaning times on the order of several hours were obtained in the presence of argon blowing at a flow rate of 10
–5
kg/(m
2
s). Based on the NIKA-M60 unit, the flow rate is 7 × 10
–7
kg/s or 2.5 g/h.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S0018151X21020115</doi><tpages>5</tpages></addata></record> |
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| subjects | Argon blowing Atoms and Molecules in Strong Fields Blowing rate Blowing time Classical and Continuum Physics Corundum Diffusion layers Flow velocity Heat and Mass Transfer and Physical Gasdynamics High temperature Impurities Industrial Chemistry/Chemical Engineering Knudsen flow Laser Matter Interaction Materials Science Mathematical models Neutral gases Physical Chemistry Physics Physics and Astronomy Sapphire Solid state Vacuum cleaning |
| title | Substantiation of Technology for the Growth of Monocrystalline Leucosapphire from Technically Pure Corundum |
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