{"id":5101,"date":"2026-05-29T17:23:40","date_gmt":"2026-05-29T15:23:40","guid":{"rendered":"https:\/\/lemgalvanica.com\/?p=5101"},"modified":"2026-05-29T17:25:20","modified_gmt":"2026-05-29T15:25:20","slug":"thermal-evaporation-pvd","status":"publish","type":"post","link":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/","title":{"rendered":"Thermal evaporation: principle, limits, and comparisons"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><em>What is thermal evaporation?<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Thermal evaporation<\/strong> is one of the fundamental techniques of <a href=\"https:\/\/lemgalvanica.com\/en\/treatments\/pvd\/\"><em>PVD (Physical Vapour Deposition)<\/em><\/a>: the <strong>source material<\/strong> is heated to its <strong>evaporation temperature<\/strong>, releasing atoms that propagate in the vacuum chamber and deposit on the substrate, forming a thin film.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is one of the most established forms of physical vapor deposition, still used in specific industrial and electronic applications.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/\/PVD_img4-800x600.jpg\" alt=\"LEM_PVD_img4\" class=\"wp-image-4474\" srcset=\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-800x600.jpg 800w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-768x576.jpg 768w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-350x263.jpg 350w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-600x450.jpg 600w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-uai-720x540.jpg 720w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4-uai-1032x774.jpg 1032w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg 1201w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><em>How heating occurs<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Energy transfer to the source material occurs through two main approaches:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Joule effect (thermal resistance):<\/strong> the material is placed in a conductive crucible crossed by an electric current. The heat generated brings the material to the evaporation temperature. It is the simplest method, suitable for materials with a relatively <strong>low melting point<\/strong> such as aluminum, silver, copper, and gold.<\/li>\n\n\n\n<li><strong>Electron beam (e-beam):<\/strong> a high-energy electron beam is directed precisely onto the source material, heating it locally until evaporation. It allows working with <strong>high-melting-point refractory materials<\/strong>, platinum, tungsten, ceramic oxides, that cannot be processed by a simple Joule effect.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><em>The role of vacuum and mean free path<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The process works exclusively under <strong>high vacuum conditions<\/strong>. At these pressures, the <strong>density of residual gases<\/strong> is low enough to ensure that the evaporated atoms<strong> travel in a straight line<\/strong> from the source to the substrate, without collisions that would disperse their energy and direction. The quality of the vacuum is therefore directly related to the uniformity and adhesion of the deposited film.<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><em>Material compatibility and crucible selection<\/em><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all materials evaporate with the same efficiency. The determining parameter is <strong>vapor pressure<\/strong>: a material with high vapor pressure at the process temperature evaporates quickly and controllably; one with very low vapor pressure is difficult to process with this technique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The choice of the <strong>crucible<\/strong>, tungsten, alumina, graphite, is equally critical: it must be chemically inert with respect to the material to be evaporated to avoid <strong>cross-contamination<\/strong> that would compromise the properties of the final film.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"800\" height=\"561\" src=\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/\/LEM-Thermal-evaporation-800x561.jpg\" alt=\"LEM - Thermal evaporation\" class=\"wp-image-5141\" srcset=\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation-800x561.jpg 800w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation-768x538.jpg 768w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation-1536x1077.jpg 1536w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation-350x245.jpg 350w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation-600x421.jpg 600w, https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM-Thermal-evaporation.jpg 1970w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">For high-precision decorative and functional applications, such as those made in <a href=\"https:\/\/lemgalvanica.com\/en\/plants\/physical-vapour-deposition-pvd\/\"><em>LEM&#8217;s PVD systems<\/em><\/a>, magnetron <a href=\"https:\/\/lemgalvanica.com\/en\/sputtering-pvd-thin-film-process\/\"><em>sputtering<\/em><\/a> is generally preferred for the superior quality and uniformity of the film. Thermal evaporation remains the most efficient choice in specific contexts where the simplicity of the process and the nature of the material make it more suitable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Related topics:<\/strong>  <a href=\"https:\/\/lemgalvanica.com\/en\/pvd-target-source-material-geometry-thermal-management\/\"><em>PVD Target<\/em><\/a><\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.<\/p>\n","protected":false},"author":10,"featured_media":4475,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[266],"tags":[],"class_list":["post-5101","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica<\/title>\n<meta name=\"description\" content=\"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica\" \/>\n<meta property=\"og:description\" content=\"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\" \/>\n<meta property=\"og:site_name\" content=\"Lem Galvanica\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-29T15:23:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-29T15:25:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1201\" \/>\n\t<meta property=\"og:image:height\" content=\"901\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Maximilian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Maximilian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\"},\"author\":{\"name\":\"Maximilian\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/#\/schema\/person\/dd77df07d6022e5d239dce5a553f5d2f\"},\"headline\":\"Thermal evaporation: principle, limits, and comparisons\",\"datePublished\":\"2026-05-29T15:23:40+00:00\",\"dateModified\":\"2026-05-29T15:25:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\"},\"wordCount\":382,\"publisher\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/#organization\"},\"image\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg\",\"articleSection\":[\"Glossary\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\",\"url\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\",\"name\":\"Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica\",\"isPartOf\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg\",\"datePublished\":\"2026-05-29T15:23:40+00:00\",\"dateModified\":\"2026-05-29T15:25:20+00:00\",\"description\":\"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.\",\"breadcrumb\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage\",\"url\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg\",\"contentUrl\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg\",\"width\":1201,\"height\":901,\"caption\":\"LEM_PVD_img4\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lemgalvanica.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Thermal evaporation: principle, limits, and comparisons\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/#website\",\"url\":\"https:\/\/lemgalvanica.com\/en\/\",\"name\":\"Lem Galvanica\",\"description\":\"Innovazione e Made in Italy nel trattamento galvanico e PVD\",\"publisher\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lemgalvanica.com\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/#organization\",\"name\":\"Lem Industries\",\"url\":\"https:\/\/lemgalvanica.com\/en\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM_LEM-nuovo-logo.jpg\",\"contentUrl\":\"https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM_LEM-nuovo-logo.jpg\",\"width\":1920,\"height\":1280,\"caption\":\"Lem Industries\"},\"image\":{\"@id\":\"https:\/\/lemgalvanica.com\/en\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.linkedin.com\/company\/lem-industries\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/lemgalvanica.com\/en\/#\/schema\/person\/dd77df07d6022e5d239dce5a553f5d2f\",\"name\":\"Maximilian\",\"description\":\"Responsabile tecnico area PVD - LEM srl\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica","description":"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/","og_locale":"en_US","og_type":"article","og_title":"Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica","og_description":"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.","og_url":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/","og_site_name":"Lem Galvanica","article_published_time":"2026-05-29T15:23:40+00:00","article_modified_time":"2026-05-29T15:25:20+00:00","og_image":[{"width":1201,"height":901,"url":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg","type":"image\/jpeg"}],"author":"Maximilian","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Maximilian","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#article","isPartOf":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/"},"author":{"name":"Maximilian","@id":"https:\/\/lemgalvanica.com\/en\/#\/schema\/person\/dd77df07d6022e5d239dce5a553f5d2f"},"headline":"Thermal evaporation: principle, limits, and comparisons","datePublished":"2026-05-29T15:23:40+00:00","dateModified":"2026-05-29T15:25:20+00:00","mainEntityOfPage":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/"},"wordCount":382,"publisher":{"@id":"https:\/\/lemgalvanica.com\/en\/#organization"},"image":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage"},"thumbnailUrl":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg","articleSection":["Glossary"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/","url":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/","name":"Thermal evaporation: principle, limits, and comparisons &#8211; Lem Galvanica","isPartOf":{"@id":"https:\/\/lemgalvanica.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage"},"image":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage"},"thumbnailUrl":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg","datePublished":"2026-05-29T15:23:40+00:00","dateModified":"2026-05-29T15:25:20+00:00","description":"Thermal evaporation in PVD: how it works, which materials it supports, and why mean free path and crucible are critical factors.","breadcrumb":{"@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#primaryimage","url":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg","contentUrl":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/PVD_img4.jpg","width":1201,"height":901,"caption":"LEM_PVD_img4"},{"@type":"BreadcrumbList","@id":"https:\/\/lemgalvanica.com\/en\/thermal-evaporation-pvd\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lemgalvanica.com\/en\/"},{"@type":"ListItem","position":2,"name":"Thermal evaporation: principle, limits, and comparisons"}]},{"@type":"WebSite","@id":"https:\/\/lemgalvanica.com\/en\/#website","url":"https:\/\/lemgalvanica.com\/en\/","name":"Lem Galvanica","description":"Innovazione e Made in Italy nel trattamento galvanico e PVD","publisher":{"@id":"https:\/\/lemgalvanica.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/lemgalvanica.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/lemgalvanica.com\/en\/#organization","name":"Lem Industries","url":"https:\/\/lemgalvanica.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/lemgalvanica.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM_LEM-nuovo-logo.jpg","contentUrl":"https:\/\/lemgalvanica.com\/wp-content\/uploads\/LEM_LEM-nuovo-logo.jpg","width":1920,"height":1280,"caption":"Lem Industries"},"image":{"@id":"https:\/\/lemgalvanica.com\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.linkedin.com\/company\/lem-industries\/"]},{"@type":"Person","@id":"https:\/\/lemgalvanica.com\/en\/#\/schema\/person\/dd77df07d6022e5d239dce5a553f5d2f","name":"Maximilian","description":"Responsabile tecnico area PVD - LEM srl"}]}},"_links":{"self":[{"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/posts\/5101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/comments?post=5101"}],"version-history":[{"count":2,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/posts\/5101\/revisions"}],"predecessor-version":[{"id":5144,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/posts\/5101\/revisions\/5144"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/media\/4475"}],"wp:attachment":[{"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/media?parent=5101"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/categories?post=5101"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lemgalvanica.com\/en\/wp-json\/wp\/v2\/tags?post=5101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}