{"id":1855,"date":"2025-03-09T08:45:00","date_gmt":"2025-03-09T06:45:00","guid":{"rendered":"https:\/\/4h-jewellery-tutorials.com\/?post_type=product&#038;p=1855"},"modified":"2025-03-11T13:12:09","modified_gmt":"2025-03-11T11:12:09","slug":"tutoriel-5-fonte-des-metaux-precieux","status":"publish","type":"product","link":"https:\/\/4h-jewellery-tutorials.com\/fr\/produit\/tutoriel-5-fonte-des-metaux-precieux\/","title":{"rendered":"Tutoriel n\u00b0 5 : Fonte des m\u00e9taux pr\u00e9cieux"},"content":{"rendered":"<p data-start=\"197\" data-end=\"608\">En <strong data-start=\"200\" data-end=\"216\">orf\u00e8vrerie<\/strong>, la <strong data-start=\"218\" data-end=\"229\">fonte<\/strong> est une \u00e9tape cruciale pour fa\u00e7onner et affiner des m\u00e9taux tels que l&rsquo;<strong data-start=\"285\" data-end=\"293\">or<\/strong>, l&rsquo;<strong data-start=\"295\" data-end=\"305\">argent<\/strong> et le <strong data-start=\"311\" data-end=\"323\">platine<\/strong>. L&rsquo;<strong data-start=\"325\" data-end=\"333\">or<\/strong> et l&rsquo;<strong data-start=\"338\" data-end=\"348\">argent<\/strong> ont des <strong data-start=\"369\" data-end=\"387\">points de fusion<\/strong> relativement bas, ce qui les rend faciles \u00e0 fondre \u00e0 l&rsquo;aide d&rsquo;un <strong data-start=\"450\" data-end=\"469\">chalumeau au<\/strong> <strong data-start=\"435\" data-end=\"446\">propane<\/strong> ou \u00e0 <strong data-start=\"450\" data-end=\"469\">l&rsquo;ac\u00e9tyl\u00e8ne<\/strong> bon march\u00e9. Lors de la fusion de ces m\u00e9taux, un <strong data-start=\"498\" data-end=\"506\">fondant<\/strong> est appliqu\u00e9 pour \u00e9liminer les impuret\u00e9s et pr\u00e9venir l&rsquo;oxydation, afin de garantir un \u00e9tat de fusion propre et lisse. <\/p>\n<p data-start=\"610\" data-end=\"799\">L&rsquo;<strong data-start=\"610\" data-end=\"618\">or<\/strong> fond \u00e0 environ <strong data-start=\"635\" data-end=\"645\">1064\u00b0C<\/strong> (1947\u00b0F), tandis que l&rsquo;<strong data-start=\"662\" data-end=\"672\">argent<\/strong> fond \u00e0 environ <strong data-start=\"696\" data-end=\"705\">962\u00b0C<\/strong> (1764\u00b0F). Une fois chauff\u00e9s, les m\u00e9taux se contractent en une goutte, pr\u00eate \u00e0 \u00eatre coul\u00e9e ou fa\u00e7onn\u00e9e. <\/p>\n<p data-start=\"801\" data-end=\"1173\">Le <strong data-start=\"801\" data-end=\"813\">platine<\/strong> pose toutefois un probl\u00e8me en raison de son <strong data-start=\"868\" data-end=\"885\">point de fusion<\/strong> beaucoup plus \u00e9lev\u00e9, qui est d&rsquo;environ <strong data-start=\"895\" data-end=\"905\">1770 \u00b0C<\/strong> (3218 \u00b0F). La fusion du <strong data-start=\"924\" data-end=\"936\">platine<\/strong> n\u00e9cessite un chalumeau sp\u00e9cialis\u00e9, tel qu&rsquo;une <strong data-start=\"978\" data-end=\"1001\">flamme oxy-ac\u00e9tyl\u00e8ne<\/strong>, capable d&rsquo;atteindre ces temp\u00e9ratures extr\u00eames. Cela rend le <strong data-start=\"1062\" data-end=\"1074\">platine<\/strong> plus difficile \u00e0 travailler, mais contribue \u00e9galement \u00e0 sa durabilit\u00e9 et \u00e0 sa valeur en <strong data-start=\"1161\" data-end=\"1172\">bijouterie<\/strong> fine.  <\/p>\n<p data-start=\"1175\" data-end=\"1352\">Qu&rsquo;il s&rsquo;agisse d&rsquo;<strong data-start=\"1196\" data-end=\"1204\">or<\/strong>, d&rsquo;<strong data-start=\"1206\" data-end=\"1216\">argent<\/strong> ou de <strong data-start=\"1221\" data-end=\"1233\">platine<\/strong>, la ma\u00eetrise du <strong data-start=\"1249\" data-end=\"1268\">processus de fonte<\/strong> est essentielle pour permettre aux <strong data-start=\"1286\" data-end=\"1300\">orf\u00e8vres<\/strong> de cr\u00e9er des <strong data-start=\"1333\" data-end=\"1351\">bijoux<\/strong> durables et de grande qualit\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;or et l&rsquo;argent peuvent \u00eatre fondus \u00e0 l&rsquo;aide d&rsquo;une flamme relativement bon march\u00e9. Un flux est appliqu\u00e9 sur le m\u00e9tal, puis chauff\u00e9 jusqu&rsquo;\u00e0 ce qu&rsquo;il se contracte en une goutte. Pour le platine, il faut une flamme avec une temp\u00e9rature de combustion plus \u00e9lev\u00e9e, car le platine ne fond qu&rsquo;\u00e0 une temp\u00e9rature d&rsquo;environ 1700 degr\u00e9s Celsius. [...]<\/p>","protected":false},"featured_media":1859,"template":"","meta":{"_acf_changed":false,"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":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[63],"product_tag":[],"class_list":["post-1855","product","type-product","status-publish","has-post-thumbnail","product_cat-bases","desktop-align-left","tablet-align-left","mobile-align-left","first","instock","virtual","taxable","purchasable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/product\/1855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/media\/1859"}],"wp:attachment":[{"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/media?parent=1855"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/product_brand?post=1855"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/product_cat?post=1855"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/4h-jewellery-tutorials.com\/fr\/wp-json\/wp\/v2\/product_tag?post=1855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}