{"id":3565,"date":"2025-12-04T11:26:52","date_gmt":"2025-12-04T03:26:52","guid":{"rendered":"https:\/\/quartz-grinding.epic-powder.com\/?p=3565"},"modified":"2026-03-19T15:17:15","modified_gmt":"2026-03-19T07:17:15","slug":"how-to-prepare-high-sphericity-silica-micro-powder-from-quartz-powder","status":"publish","type":"post","link":"https:\/\/quartz-grinding.epic-powder.com\/fr\/how-to-prepare-high-sphericity-silica-micro-powder-from-quartz-powder\/","title":{"rendered":"Comment pr\u00e9parer de la micropoudre de silice de haute sph\u00e9ricit\u00e9 \u00e0 partir de poudre de quartz ?"},"content":{"rendered":"<p>La micropoudre de silice \u00e0 haute sph\u00e9ricit\u00e9 (sph\u00e9ricit\u00e9 \u2265 0,95, souvent appel\u00e9e SiO\u2082 sph\u00e9rique) est une poudre fonctionnelle essentielle dans des domaines de pointe tels que les substrats 5G, les stratifi\u00e9s cuivr\u00e9s (CCL), les compos\u00e9s de moulage \u00e9poxy EMC, les adh\u00e9sifs silicones et les mat\u00e9riaux d&#039;interface thermique. La poudre de quartz traditionnelle, produite par broyage m\u00e9canique, pr\u00e9sente des formes angulaires irr\u00e9guli\u00e8res. Son utilisation directe entra\u00eene une viscosit\u00e9 \u00e9lev\u00e9e, une faible capacit\u00e9 de remplissage et une mauvaise fluidit\u00e9, rendant indispensable le traitement de sph\u00e9risation.<\/p>\n\n\n\n<p>Ci-dessous figure la voie de proc\u00e9d\u00e9 compl\u00e8te la plus mature, la plus rentable et la plus valid\u00e9e industriellement (largement adopt\u00e9e en Chine de 2023 \u00e0 2025) capable d&#039;atteindre une sph\u00e9ricit\u00e9 stable de 0,96 \u00e0 0,99.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"544\" height=\"690\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/spherical-silica-powder.webp\" alt=\"poudre de silice sph\u00e9rique\" class=\"wp-image-3393\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/spherical-silica-powder.webp 544w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/spherical-silica-powder-237x300.webp 237w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/spherical-silica-powder-9x12.webp 9w\" sizes=\"(max-width: 544px) 100vw, 544px\" \/><figcaption class=\"wp-element-caption\">poudre de silice sph\u00e9rique<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">S\u00e9lection et pr\u00e9traitement des mati\u00e8res premi\u00e8res<\/h2>\n\n\n\n<p>La premi\u00e8re et la plus cruciale \u00e9tape dans la production de micropoudre de silice \u00e0 haute sph\u00e9ricit\u00e9 consiste \u00e0 choisir la poudre de quartz appropri\u00e9e et \u00e0 effectuer un pr\u00e9traitement raffin\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Besoins en mati\u00e8res premi\u00e8res<\/h3>\n\n\n\n<p><strong>Haute puret\u00e9 :<\/strong><br>Une poudre de quartz de haute puret\u00e9 (SiO\u2082 \u2265 99,95%, de pr\u00e9f\u00e9rence \u2265 99,99%) est requise. Les impuret\u00e9s telles que Fe, Al, K et Na doivent \u00eatre extr\u00eamement faibles. Ces impuret\u00e9s r\u00e9duisent la r\u00e9sistance thermique et les propri\u00e9t\u00e9s di\u00e9lectriques de la silice sph\u00e9rique et peuvent nuire \u00e0 sa sph\u00e9ricit\u00e9 lors de la fusion \u00e0 haute temp\u00e9rature.<\/p>\n\n\n\n<p><strong>Distribution granulom\u00e9trique :<\/strong><br>Utilisez une poudre de quartz fondu de haute puret\u00e9, finement broy\u00e9e et class\u00e9e. La granulom\u00e9trie doit \u00eatre aussi concentr\u00e9e que possible, avec un D50 g\u00e9n\u00e9ralement proche de la taille cible du produit. \u00c9vitez les particules trop grossi\u00e8res ou trop fines.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pr\u00e9traitement<\/h3>\n\n\n\n<p><strong>Broyage et classification ultrafins\u00a0:<\/strong><br>La mati\u00e8re premi\u00e8re de quartz est trait\u00e9e \u00e0 l&#039;aide de <a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/machines\/\">broyeurs ultrafins<\/a> (tel que<a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/machines\/jet-mill\/\"> broyeurs \u00e0 jet<\/a>) et <a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/ultrafine-air-classifier\/\">classificateurs de haute pr\u00e9cision<\/a> (tels que les classificateurs \u00e0 turbine) pour obtenir des poudres avec une distribution granulom\u00e9trique \u00e9troite.<\/p>\n\n\n\n<p><strong>Purification chimique (lixiviation acide) :<\/strong><br>La poudre de quartz est lav\u00e9e \u00e0 l&#039;acide (avec HCl, HF ou eau r\u00e9gale) afin d&#039;\u00e9liminer les impuret\u00e9s m\u00e9talliques pr\u00e9sentes en surface et \u00e0 l&#039;int\u00e9rieur du r\u00e9seau cristallin. Cette \u00e9tape est essentielle pour garantir les propri\u00e9t\u00e9s \u00e9lectriques du produit final.<\/p>\n\n\n\n<p><strong>S\u00e9chage:<\/strong><br>S\u00e9chez soigneusement la poudre de quartz purifi\u00e9e pour \u00e9liminer l&#039;humidit\u00e9 de surface.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"596\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/ultrafine-quartz-powder-solution-jet-mill.webp\" alt=\"Broyeur \u00e0 jet d&#039;eau pour poudre de quartz ultrafine\" class=\"wp-image-3559\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/ultrafine-quartz-powder-solution-jet-mill.webp 800w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/ultrafine-quartz-powder-solution-jet-mill-300x224.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/ultrafine-quartz-powder-solution-jet-mill-768x572.webp 768w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/ultrafine-quartz-powder-solution-jet-mill-16x12.webp 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Broyeur \u00e0 jet d&#039;eau pour poudre de quartz ultrafine<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Technologie de base : Sph\u00e9ro\u00efdisation par fusion plasma \u00e0 haute temp\u00e9rature<\/h2>\n\n\n\n<p>La fusion par plasma est la technologie cl\u00e9 pour transformer la poudre de quartz pr\u00e9trait\u00e9e en une forme sph\u00e9rique. Il s&#039;agit actuellement de la m\u00e9thode industrielle dominante pour produire de la silice sph\u00e9rique de haute sph\u00e9ricit\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 Technologie plasma<\/h3>\n\n\n\n<p>Les torches \u00e0 plasma g\u00e9n\u00e8rent des zones \u00e0 tr\u00e8s haute temp\u00e9rature allant de 4000\u00b0C \u00e0 10000\u00b0C, bien au-dessus du point de fusion du SiO\u2082 (environ 1650\u00b0C).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Torche \u00e0 plasma de type<\/th><th>Caract\u00e9ristiques principales<\/th><th>Applicabilit\u00e9<\/th><\/tr><\/thead><tbody><tr><td>Plasma RF (radiofr\u00e9quence)<\/td><td>Champ de temp\u00e9rature uniforme, contr\u00f4le pr\u00e9cis de l&#039;atmosph\u00e8re, introduction minimale d&#039;impuret\u00e9s.<\/td><td>Id\u00e9al pour la production de silice sph\u00e9rique de haute puret\u00e9 et de granulom\u00e9trie \u00e9troite, destin\u00e9e \u00e0 des applications haut de gamme.<\/td><\/tr><tr><td>Plasma \u00e0 courant continu (CC)<\/td><td>Densit\u00e9 \u00e9nerg\u00e9tique \u00e9lev\u00e9e, co\u00fbt des \u00e9quipements relativement faible.<\/td><td>Adapt\u00e9 \u00e0 la production \u00e0 grande \u00e9chelle de produits de milieu et bas de gamme.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Proc\u00e9d\u00e9 de fusion et de sph\u00e9ro\u00efdisation<\/h3>\n\n\n\n<p><strong>Alimentation:<\/strong><br>La poudre de quartz pr\u00e9trait\u00e9e est introduite dans la zone de plasma \u00e0 haute temp\u00e9rature par un syst\u00e8me d&#039;alimentation pr\u00e9cis, g\u00e9n\u00e9ralement sous forme de m\u00e9lange gaz-solide pour assurer une injection uniforme.<\/p>\n\n\n\n<p><strong>Fusion et sph\u00e9ro\u00efdisation :<\/strong><br>Lorsque les particules traversent la zone de plasma, elles absorbent rapidement la chaleur et subissent une fusion superficielle ou compl\u00e8te. Sous l&#039;effet de la tension superficielle, les particules de silice fondue se contractent pour former des sph\u00e8res quasi parfaites.<\/p>\n\n\n\n<p><strong>Trempe et refroidissement :<\/strong><br>Apr\u00e8s avoir quitt\u00e9 la zone \u00e0 haute temp\u00e9rature, les particules sph\u00e9riques fondues sont imm\u00e9diatement dirig\u00e9es vers une zone de refroidissement rapide (trempe) \u2014 g\u00e9n\u00e9ralement une atmosph\u00e8re de gaz inerte ou de l&#039;air \u2014 pour solidifier rapidement la forme sph\u00e9rique et \u00e9viter l&#039;agglom\u00e9ration ou la d\u00e9formation.<\/p>\n\n\n\n<p><strong>Collection:<\/strong><br>Les particules de silice sph\u00e9riques solidifi\u00e9es sont collect\u00e9es \u00e0 l&#039;aide d&#039;un s\u00e9parateur cyclonique ou d&#039;un filtre \u00e0 sac.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Post-traitement (d\u00e9termine la performance finale de l&#039;application)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Dispersion et <a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/ultrafine-air-classifier\/\">Classification<\/a><\/h3>\n\n\n\n<p>Bien que la fusion au plasma r\u00e9duise l&#039;agglom\u00e9ration, un classement \u00e0 l&#039;air de haute pr\u00e9cision ou une dispersion ultrasonique reste n\u00e9cessaire pour \u00e9liminer les particules irr\u00e9guli\u00e8res ultrafines et surdimensionn\u00e9es, garantissant une distribution granulom\u00e9trique et une sph\u00e9ricit\u00e9 qualifi\u00e9es.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/surface-modification\/\">Modification des surfaces<\/a><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"523\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/powder-coating-machine-1.webp\" alt=\"machine de rev\u00eatement en poudre\" class=\"wp-image-3392\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/powder-coating-machine-1.webp 800w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/powder-coating-machine-1-300x196.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/powder-coating-machine-1-768x502.webp 768w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/10\/powder-coating-machine-1-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Pour les applications d&#039;encapsulation \u00e9lectronique, la silice sph\u00e9rique n\u00e9cessite g\u00e9n\u00e9ralement un traitement de surface au silane pour am\u00e9liorer la compatibilit\u00e9 et la dispersion dans les matrices \u00e9poxy.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Types de silanes\u00a0:<\/strong>\n<ul class=\"wp-block-list\">\n<li>KH550 \/ KH560 \/ KH570 \u2192 pour CEM, CCL<\/li>\n\n\n\n<li>Ph\u00e9nylsilane\/m\u00e9thylsilane \u2192 pour les mat\u00e9riaux silicones haute temp\u00e9rature<\/li>\n\n\n\n<li>Silane \u00e9poxy\/acrylate \u2192 pour les mat\u00e9riaux d&#039;interface thermique<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Facteurs cl\u00e9s affectant la sph\u00e9ricit\u00e9<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Distribution granulom\u00e9trique de la poudre brute<\/strong><br>Une taille de particules plus \u00e9troite et plus uniforme permet un chauffage et une fusion plus homog\u00e8nes dans le plasma, am\u00e9liorant ainsi le taux de sph\u00e9ro\u00efdisation.<\/li>\n\n\n\n<li><strong>Temp\u00e9rature du plasma et temps de s\u00e9jour<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Temp\u00e9rature:<\/strong> Doit \u00eatre suffisamment \u00e9lev\u00e9e pour assurer une fusion instantan\u00e9e.<\/li>\n\n\n\n<li><strong>Dur\u00e9e de s\u00e9jour :<\/strong> La dur\u00e9e doit \u00eatre contr\u00f4l\u00e9e avec pr\u00e9cision\u00a0: suffisamment longue pour une fusion compl\u00e8te, mais suffisamment courte pour \u00e9viter la vaporisation ou l\u2019agglom\u00e9ration.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Vitesse de refroidissement<\/strong><br>Un refroidissement rapide est essentiel. Un refroidissement lent provoque des d\u00e9formations ou un collage entre les particules, r\u00e9duisant ainsi leur sph\u00e9ricit\u00e9.<\/li>\n\n\n\n<li><strong>Taux d&#039;alimentation et uniformit\u00e9<\/strong><br>L&#039;alimentation doit \u00eatre stable et uniforme. Une vitesse trop \u00e9lev\u00e9e r\u00e9duit le temps de chauffage par particule, ce qui entra\u00eene la formation de particules irr\u00e9guli\u00e8res partiellement fondues.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/quartz-grinding.epic-powder.com\/fr\/contact\/\">Conclusion<\/a><\/h2>\n\n\n\n<p>La production de micropoudre de silice de haute sph\u00e9ricit\u00e9 \u00e0 partir de poudre de quartz est un proc\u00e9d\u00e9 int\u00e9gr\u00e9 complexe comprenant un raffinage de haute puret\u00e9, un broyage et un classement ultrafins, ainsi qu&#039;une fusion plasma \u00e0 haute temp\u00e9rature. En contr\u00f4lant rigoureusement la puret\u00e9 des mati\u00e8res premi\u00e8res, en optimisant les param\u00e8tres de fusion plasma (temp\u00e9rature et temps de s\u00e9jour) et en assurant une trempe rapide et efficace, les fabricants peuvent produire de mani\u00e8re fiable une silice sph\u00e9rique de haute puret\u00e9 et de haute sph\u00e9ricit\u00e9 r\u00e9pondant aux exigences strictes des applications d&#039;encapsulation \u00e9lectronique avanc\u00e9e et des mat\u00e9riaux sp\u00e9ciaux.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized is-style-rounded\"><img loading=\"lazy\" decoding=\"async\" width=\"721\" height=\"721\" src=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp\" alt=\"Emily Chen\" class=\"wp-image-3549\" style=\"width:150px;height:150px\" srcset=\"https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen.webp 721w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-300x300.webp 300w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-150x150.webp 150w, https:\/\/quartz-grinding.epic-powder.com\/wp-content\/uploads\/2025\/11\/Emily-Chen-12x12.webp 12w\" sizes=\"(max-width: 721px) 100vw, 721px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote has-text-align-center is-style-large is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u00ab Merci de votre lecture. J\u2019esp\u00e8re que cet article vous sera utile. N\u2019h\u00e9sitez pas \u00e0 laisser un commentaire ci-dessous. Pour toute question, vous pouvez \u00e9galement contacter le service client en ligne de Zelda. \u00bb<\/p>\n<cite>                                                                                                                                                                               \u2014 Publi\u00e9 par <a href=\"https:\/\/www.linkedin.com\/company\/76603359\/admin\/dashboard\/\">Emily Chen<\/a><\/cite><\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-default\"\/>\n\n\n\n<div class=\"wp-block-contact-form-7-contact-form-selector\">\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f16-o1\" lang=\"zh-CN\" dir=\"ltr\" data-wpcf7-id=\"16\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/fr\/wp-json\/wp\/v2\/posts\/3565#wpcf7-f16-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"\u7559\u8a00\u8868\u5355\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/fr\/wp-json\/wp\/v2\/posts\/3565#wpcf7-f16-o1\">\n<div style=\"display: none;\">\n<input type=\"hidden\" name=\"_wpcf7\" value=\"16\" \/>\n<input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.0.6\" \/>\n<input type=\"hidden\" name=\"_wpcf7_locale\" value=\"zh_CN\" \/>\n<input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f16-o1\" \/>\n<input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/>\n<input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/>\n<\/div>\n<div class=\"keen-form\">\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-name\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre nom*\" value=\"\" type=\"text\" name=\"your-name\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre email*\" value=\"\" type=\"email\" name=\"your-email\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"pnone\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-tel\" aria-required=\"true\" aria-invalid=\"false\" placeholder=\"Votre Pnone ou Whatsapp*\" value=\"\" type=\"tel\" name=\"pnone\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div class=\"one-half last\">\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-subject\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"Votre entreprise\" value=\"\" type=\"text\" name=\"your-subject\" \/><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><span class=\"wpcf7-form-control-wrap\" data-name=\"your-message\"><textarea cols=\"40\" rows=\"3\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" placeholder=\"Votre message\" name=\"your-message\"><\/textarea><\/span>\n\t\t<\/p>\n\t<\/div>\n\t<div>\n\t\t<p><input class=\"wpcf7-form-control wpcf7-submit has-spinner\" type=\"submit\" value=\"Soumettre\" \/>\n\t\t<\/p>\n\t<\/div>\n<\/div>\n<style>\n.keen-form div{margin-bottom:5px;}\n.keen-form div p{margin-bottom:0px !important;}\n.one-half,.one-third {\n position: relative;\n margin-right: 4%;\n float: left;\n z-index: 99;\n}\n.one-half { width: 48%; }\n.one-third { width: 30.66%; }\n.last {\n margin-right: 0 !important;\n clear: right;\n}\n@media only screen and (max-width: 767px) {\n .one-half, .one-third {\n width: 100%;\n margin-right: 0;\n }\n}\n<\/style><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<input type=\"hidden\" name=\"trp-form-language\" value=\"fr\"\/><\/form>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>La micropoudre de silice \u00e0 haute sph\u00e9ricit\u00e9 (sph\u00e9ricit\u00e9 \u2265 0,95, souvent appel\u00e9e SiO\u2082 sph\u00e9rique) est une poudre fonctionnelle essentielle dans des domaines de pointe tels que les substrats 5G, les stratifi\u00e9s cuivr\u00e9s (CCL), les compos\u00e9s de moulage \u00e9poxy EMC, les adh\u00e9sifs silicones et les mat\u00e9riaux d&#039;interface thermique. La poudre de quartz traditionnelle, produite par broyage m\u00e9canique, pr\u00e9sente des formes angulaires irr\u00e9guli\u00e8res. Son utilisation directe entra\u00eene une viscosit\u00e9 \u00e9lev\u00e9e du syst\u00e8me et un faible taux de 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