{"id":15672,"date":"2023-09-14T07:26:26","date_gmt":"2023-09-14T07:26:26","guid":{"rendered":"http:\/\/quartz-grinding.com\/?p=15672"},"modified":"2023-09-14T07:26:29","modified_gmt":"2023-09-14T07:26:29","slug":"what-are-the-effects-of-different-impurity-elements-on-the-quality-of-high-purity-quartz-products","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/fr\/what-are-the-effects-of-different-impurity-elements-on-the-quality-of-high-purity-quartz-products\/","title":{"rendered":"Quels sont les effets des diff\u00e9rents \u00e9l\u00e9ments d\u2019impuret\u00e9s sur la qualit\u00e9 des produits \u00e0 base de quartz de haute puret\u00e9\u00a0?"},"content":{"rendered":"

Les \u00e9l\u00e9ments d'impuret\u00e9s ont un impact significatif sur la qualit\u00e9 des produits \u00e0 base de quartz de haute puret\u00e9, et la teneur en m\u00e9taux alcalins, m\u00e9taux de transition, \u00e9l\u00e9ments Al et B est un indicateur cl\u00e9 des mati\u00e8res premi\u00e8res de quartz de haute puret\u00e9. Les exigences relatives \u00e0 la teneur en \u00e9l\u00e9ments d'impuret\u00e9s varient en fonction de la destination du verre de quartz pr\u00e9par\u00e9, mais la tendance g\u00e9n\u00e9rale est que plus elle est faible, mieux c'est.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

\u00c9l\u00e9ment m\u00e9tallique alcalin<\/h2>\n\n\n\n

Les \u00e9l\u00e9ments m\u00e9talliques alcalins contenus dans le sable de quartz comprennent principalement les \u00e9l\u00e9ments lithium (Li), sodium (Na) et potassium (K). Ces \u00e9l\u00e9ments se diffusent facilement et sont chimiquement actifs dans le quartz, ce qui les rend relativement faciles \u00e0 \u00e9liminer. Cependant, ils causent de graves dommages. \u00c0 haute temp\u00e9rature, ces \u00e9l\u00e9ments agissent comme des flux, provoquant de mauvais ph\u00e9nom\u00e8nes tels qu'une perte de transparence et une d\u00e9formation \u00e0 haute temp\u00e9rature du verre \u00e0 haute temp\u00e9rature. Ils catalysent la cristallisation, affectent la stabilit\u00e9 thermique des produits \u00e0 quartz et affectent \u00e9galement les propri\u00e9t\u00e9s optiques et thermiques du verre de quartz, r\u00e9duisant ainsi la dur\u00e9e de vie des semi-conducteurs. Le coefficient di\u00e9lectrique et la perte di\u00e9lectrique du verre de quartz augmenteront, tandis que la vitesse de propagation et la r\u00e9sistance m\u00e9canique de la lumi\u00e8re dans les produits \u00e0 quartz diminuera.<\/p>\n\n\n\n

La r\u00e9duction de la teneur en \u00e9l\u00e9ments m\u00e9talliques alcalins est b\u00e9n\u00e9fique pour am\u00e9liorer le point de ramollissement des creusets en quartz de haute puret\u00e9, am\u00e9liorer leur r\u00e9sistance \u00e0 la d\u00e9formation et am\u00e9liorer le rendement des monocristaux. Le sable standard IOTA n\u00e9cessite un total de 2,4 \u00e9l\u00e9ments de m\u00e9taux alcalins \u00d7 10-6, le quartz de haute puret\u00e9 total requis pour les creusets semi-conducteurs utilis\u00e9s pour les tubes de traitement, le traitement des plaquettes de silicium, les blocs de quartz et l'extraction de silicium monocristallin est de 1,4 \u00d7 10-6, CZ les creusets n\u00e9cessitent un total de 0,5 \u00d7 10-6, et le total requis pour le sable de quartz de tr\u00e8s haute puret\u00e9 utilis\u00e9 pour les tranches de silicium de 12 pouces ou plus est de 0,08 \u00d7 10-6.<\/p>\n\n\n\n

\u00c9l\u00e9ments m\u00e9talliques de transition<\/h2>\n\n\n\n

Les \u00e9l\u00e9ments de m\u00e9taux de transition dop\u00e9s dans le sable de quartz comprennent principalement le fer (Fe), le zinc (Zn), le cuivre (Cu), le chrome (Cr), le mangan\u00e8se (Mn), le nickel (Ni) et d'autres \u00e9l\u00e9ments. Ces \u00e9l\u00e9ments ont un impact significatif sur les produits \u00e0 base de quartz et des oligo-\u00e9l\u00e9ments peuvent se dissoudre dans le silicium fondu pour emp\u00eacher la conductivit\u00e9, ce qui nuit \u00e0 la pr\u00e9visibilit\u00e9 et \u00e0 la fiabilit\u00e9 de l'instrument. L\u2019impact objectif sur les produits \u00e0 base de quartz est de produire des taches de couleur ou de provoquer une d\u00e9coloration \u00e0 haute temp\u00e9rature, r\u00e9duisant ainsi la transmission de la lumi\u00e8re.<\/p>\n\n\n\n

Dans les applications de fibre optique, cela peut provoquer des micro-irr\u00e9gularit\u00e9s, augmenter la perte de fibre et m\u00eame conduire \u00e0 une distorsion du signal. Cependant, dans les applications de semi-conducteurs, la faible teneur en \u00e9l\u00e9ments m\u00e9talliques de transition dans le produit peut favoriser la croissance cristalline.<\/p>\n\n\n\n

\u00c9l\u00e9ment en aluminium et bore<\/h2>\n\n\n\n

La teneur en \u00e9l\u00e9ment bore (B) du sable de quartz est directement li\u00e9e \u00e0 la g\u00e9ologie du minerai de quartz. Les ions B peuvent p\u00e9n\u00e9trer dans la structure des mol\u00e9cules de silicate et g\u00e9n\u00e9rer des liaisons chimiques fortes, plut\u00f4t que uniquement dans les min\u00e9raux contenant du bore. La quantit\u00e9 excessive d'\u00e9l\u00e9ment B a un impact fatal sur l'\u00e9tirage du silicium monocristallin, et un \u00e9l\u00e9ment B 1 \u00d7 10-6 peut r\u00e9duire consid\u00e9rablement la r\u00e9sistance du silicium monocristallin. Les creusets en quartz de haute puret\u00e9 n\u00e9cessitent des exigences \u00e9lev\u00e9es en mati\u00e8re de B, avec une teneur en \u00e9l\u00e9ments inf\u00e9rieure \u00e0 0,04 \u00d7 10-6.<\/p>\n\n\n\n

L\u2019\u00e9l\u00e9ment aluminium (Al) existe principalement dans les min\u00e9raux impuret\u00e9s tels que le feldspath, l\u2019argile et le mica du sable de quartz. C'est l'\u00e9l\u00e9ment d'impuret\u00e9 le plus abondant dans le sable de quartz, et Al peut entrer dans la structure t\u00e9tra\u00e9drique Si-O pour remplacer le silicium, formant ainsi une structure Al-O. Apr\u00e8s que Al3+ ait remplac\u00e9 Si4+, des \u00e9l\u00e9ments m\u00e9talliques alcalins ou m\u00eame des \u00e9l\u00e9ments m\u00e9talliques de transition sont s\u00e9lectionn\u00e9s pour compenser la charge afin d'\u00e9quilibrer la charge. L'Al entrant dans le squelette Si-O ne sera pas facilement \u00e9limin\u00e9. L'aluminium a peu d'effet sur les semi-conducteurs, mais il a un impact significatif sur le verre de quartz utilis\u00e9 pour les sources de lumi\u00e8re \u00e9lectrique. \u00c9tant donn\u00e9 que l\u2019IA peut colorer les produits \u00e0 quartz dans certaines conditions, elle affecte la transmission spectrale et donc l\u2019efficacit\u00e9 lumineuse. Le sable standard IOTA n\u00e9cessite une teneur en \u00e9l\u00e9ments Al (12-18) \u00d7 10-6.<\/p>\n\n\n\n

\u00c9l\u00e9ments non m\u00e9talliques<\/h2>\n\n\n\n

Les \u00e9l\u00e9ments non m\u00e9talliques du sable de quartz sont principalement compos\u00e9s d'oxyg\u00e8ne (O), d'hydrog\u00e8ne (H), d'azote (N) et d'autres \u00e9l\u00e9ments. Le corps principal de l\u2019oxyg\u00e8ne est SiO2, tandis que d\u2019autres existent sous forme de H2O, N2 et O2. La rupture des liaisons Si-O dans SiO2 entra\u00eenera des d\u00e9fauts qui se combineront avec OH ou H pour former des groupes SiH ou SiOH. Les groupes hydroxyle sont \u00e0 la fois des d\u00e9fauts d\u2019impuret\u00e9s et des d\u00e9fauts structurels du r\u00e9seau.<\/p>\n\n\n\n

Les groupes hydroxyle ont un impact significatif sur les propri\u00e9t\u00e9s du quartz et du verre de quartz. Premi\u00e8rement, la pr\u00e9sence de groupes hydroxyles r\u00e9duit la stabilit\u00e9 chimique du quartz. Deuxi\u00e8mement, les groupes hydroxyle augmentent la porosit\u00e9 de la structure du quartz, r\u00e9duisent la densit\u00e9, diminuent la force de liaison et r\u00e9duisent la vitesse de propagation du son dans le verre de quartz. Les groupes hydroxyles peuvent \u00e9galement r\u00e9duire la viscosit\u00e9 du quartz, et la pr\u00e9sence de groupes hydroxyles \u00e0 basse temp\u00e9rature peut entra\u00eener une diminution plus significative de la viscosit\u00e9. De plus, les groupes hydroxyle affectent \u00e9galement la puret\u00e9 des produits \u00e9lectroniques, r\u00e9duisent la temp\u00e9rature de ramollissement du quartz, favorisent la pr\u00e9cipitation des cristaux, r\u00e9duisent l'indice de r\u00e9fraction du quartz et affectent l'uniformit\u00e9 optique du verre de quartz.<\/p>","protected":false},"excerpt":{"rendered":"

Les \u00e9l\u00e9ments d'impuret\u00e9s ont un impact significatif sur la qualit\u00e9 des produits \u00e0 base de quartz de haute puret\u00e9, et la teneur en m\u00e9taux alcalins, m\u00e9taux de transition, \u00e9l\u00e9ments Al et B est un indicateur cl\u00e9 de [\u2026]<\/p>","protected":false},"author":1,"featured_media":15674,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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