[{"data":1,"prerenderedAt":377},["ShallowReactive",2],{"blog-glass-transition-temperature-tg-ar":3,"header-nav-ar":46},{"title":4,"description":5,"date":6,"lastUpdated":6,"category":7,"image":8,"readingTime":9,"wordCount":10,"timeRequired":11,"htmlContent":12,"tags":13,"slug":21,"jsonld":22},"درجة حرارة التحول الزجاجي (Tg): معناها للوحات المطبوعة","تحدد درجة حرارة التحول الزجاجي (Tg) انتقال البوليمر من الحالة الصلبة إلى المطاطية. تعرف على دور Tg و Td و CTE في موثوقية اللوحات.","2026-10-09","materials","/assets/img/pcb/high-tg/pcb-high-tg-pcb-hero.webp",2,333,"PT2M","\u003Ch2 id=\"key-takeaways\" data-anchor-en=\"key-takeaways\">النقاط الرئيسية\u003C/h2>\n\u003Cul>\n\u003Cli>\u003Cstrong>تعريف Tg:\u003C/strong> درجة حرارة التحول الزجاجي هي النطاق الحراري الحرج الذي يتحول فيه البوليمر غير المتبلور من حالة صلبة زجاجية إلى حالة مرنة ومطاطية.\u003C/li>\n\u003Cli>\u003Cstrong>ليست نقطة انصهار:\u003C/strong> التحول الزجاجي ليس ذوباناً؛ الراتنج لا يسيل، بل هو تغير ديناميكي حراري قابل للعكس.\u003C/li>\n\u003Cli>\u003Cstrong>قفزة التمدد الحراري في المحور Z:\u003C/strong> فوق Tg، يرتفع معدل التمدد الحراري العمودي بنسبة \u003Cstrong>400% إلى 500%\u003C/strong> (من ~50 ppm/°C إلى ~260 ppm/°C)، مما يضع إجهاداً شديداً على فتحات النحاس المطلية (PTH).\u003C/li>\n\u003Cli>\u003Cstrong>التصنيفات الصناعية:\u003C/strong> FR-4 قياسي ($T_g \\approx 130\\text{--}140^\\circ\\text{C}$)، ومتوسط $T_g$ ($T_g \\approx 150^\\circ\\text{C}$)، وعالي $T_g$ ($T_g \\ge 170^\\circ\\text{C}$).\u003C/li>\n\u003Cli>\u003Cstrong>متى يلزم الترقية:\u003C/strong> ركائز High-Tg إلزامية للوحات التي تتجاوز 8 طبقات، ولعمليات اللحام الخالي من الرصاص ($260^\\circ\\text{C}$)، والبيئات الصناعية القاسية.\u003C/li>\n\u003C/ul>\n\u003Cdiv data-component=\"BlogQuickQuoteInline\">\u003C/div>\n\n\u003Ch2 id=\"what-is-glass-transition-temperature-definition-and-physics\" data-anchor-en=\"what-is-glass-transition-temperature-definition-and-physics\">ما هي درجة حرارة التحول الزجاجي؟ المفهوم والفيزياء\u003C/h2>\n\u003Cp>في علم البوليمرات، ترتبط \u003Cstrong>درجة حرارة التحول الزجاجي\u003C/strong> بحركة السلاسل الجزيئية. عند درجة حرارة الغرفة تكون السلاسل مقيدة في شبكة صلبة. ومع زيادة الطاقة الحرارية وتجاوز عتبة $T_g$، تنزلق السلاسل وتنخفض الصلابة الميكانيكية.\u003C/p>\n\u003Ch2 id=\"tg-ipc\" data-anchor-en=\"how-is-tg-measured-dsc-tma-dma\">طرق قياس Tg المعتمدة في IPC\u003C/h2>\n\u003Cp>تعتمد صناعة الدوائر المطبوعة ثلاث طرق قياسية وفق IPC-TM-650:\u003C/p>\n\u003Col>\n\u003Cli>\u003Cstrong>قياس المسعر بالمسح التفاضلي (DSC, IPC-TM-650 2.4.25)\u003C/strong>\u003C/li>\n\u003Cli>\u003Cstrong>التحليل الميكانيكي الحراري (TMA, IPC-TM-650 2.4.24)\u003C/strong>\u003C/li>\n\u003Cli>\u003Cstrong>التحليل الميكانيكي الديناميكي (DMA, IPC-TM-650 2.4.24.4)\u003C/strong>\u003C/li>\n\u003C/ol>\n\u003Ch2 id=\"tg\" data-anchor-en=\"tg-vs-td-vs-time-to-delamination-t260-t288\">الأسئلة الشائعة حول Tg للدوائر المطبوعة\u003C/h2>\n\u003Ch3 id=\"1-glass-transition-temperature-tg\" data-anchor-en=\"1-glass-transition-temperature-tg\">ماذا تعني درجة حرارة التحول الزجاجي للوحة المطبوعة؟\u003C/h3>\n\u003Cp>هي درجة الحرارة التي تبدأ عندها مصفوفة الإيبوكسي بفقدان صلابتها ويتسارع تمددها الحراري في الاتجاه الرأسي.\u003C/p>\n\u003Ch3 id=\"tg-2\" data-anchor-en=\"2-decomposition-temperature-td\">هل تمثل Tg درجة حرارة التشغيل القصوى؟\u003C/h3>\n\u003Cp>لا، يجب أن تظل درجة حرارة التشغيل المستمرة أقل بمقدار 20 إلى 30 درجة مئوية على الأقل من Tg.\u003C/p>\n\u003Ch3 id=\"high-tg\" data-anchor-en=\"3-time-to-delamination-t260-and-t288\">لماذا تعد High-Tg ضرورية للحام الخالي من الرصاص؟\u003C/h3>\n\u003Cp>تصل حرارة اللحام الخالي من الرصاص إلى 260 مئوية؛ وتمنع ركائز High-Tg حدوث تصدعات في الفتحات وانفصال الطبقات.\u003C/p>\n\u003Ch2 id=\"why-tg-matters-in-lead-free-assembly\" data-anchor-en=\"why-tg-matters-in-lead-free-assembly\">موارد وأدلة تقنية ذات صلة\u003C/h2>\n\u003Cul>\n\u003Cli>\u003Ca href=\"/ar/blog/fr4-material-properties\">/blog/fr4-material-properties\u003C/a> - Complete FR-4 material properties, Dk, and thermal specifications\u003C/li>\n\u003Cli>\u003Ca href=\"/ar/materials\">/materials\u003C/a> - High-Tg and high-frequency substrate materials catalog\u003C/li>\n\u003Cli>\u003Ca href=\"/ar/pcb\">/pcb\u003C/a> - Fabrication specifications for high-layer-count multilayer circuit boards\u003C/li>\n\u003Cli>\u003Ca href=\"/ar/pcba\">/pcba\u003C/a> - Lead-free RoHS surface-mount assembly thermal profiles\u003C/li>\n\u003C/ul>\n\n\u003Csection class=\"related-links\" aria-label=\"Related\">\u003Ch3>Related links\u003C/h3>\u003Cul>\u003Cli>\u003Ca href=\"/ar/blog/fr4-material-properties\">/blog/fr4-material-properties\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/ar/materials\">/materials\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/ar/pcb\">/pcb\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/ar/pcba\">/pcba\u003C/a>\u003C/li>\u003C/ul>\u003C/section>",[14,15,16,17,18,19,20],"Glass Transition Temperature","PCB Tg","High Tg PCB","Thermal Reliability","FR4 Material","Lead-Free Assembly","CTE Expansion","glass-transition-temperature-tg",{"blog":23,"breadcrumb":32,"faq":45},{"@context":24,"@type":25,"headline":4,"description":5,"image":8,"url":26,"datePublished":6,"dateModified":6,"timeRequired":11,"keywords":27,"articleSection":7,"author":28,"publisher":31},"https://schema.org","BlogPosting","https://aptpcb.com/ar/blog/glass-transition-temperature-tg","Glass Transition Temperature, PCB Tg, High Tg PCB, Thermal Reliability, FR4 Material, Lead-Free Assembly, CTE 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