{"id":10020,"date":"2020-03-11T11:19:36","date_gmt":"2020-03-11T10:19:36","guid":{"rendered":"https:\/\/kluthe.com\/magazin\/?p=10020"},"modified":"2025-08-20T11:51:29","modified_gmt":"2025-08-20T09:51:29","slug":"hardmetal-coating","status":"publish","type":"post","link":"https:\/\/kluthe.com\/magazin\/en\/hardmetal-coating\/","title":{"rendered":"Hardmetal Coating"},"content":{"rendered":"<h2>\u00ab Your Options for Surface Coating \u00bb<\/h2>\n<p style=\"text-align: justify;\"><strong>The term hardmetal coating can refer to two different processes: applying a hardmetal layer to conventional metals, or enhancing existing hardmetal components with highly wear-resistant materials. These composites consist of a metallic binder, known as the matrix, combined with hard non-metallic phases that provide the exceptional wear resistance.<\/strong><\/p>\n<h2>How Does Materials Science Define &#8220;Hardness&#8221;?<\/h2>\n<p style=\"text-align: justify;\">Around 200 years ago, geologist Friedrich Mohs ranked minerals according to how easily they could be scratched by another material. The stone capable of scratching all others was the diamond, the hardest natural material. Talc, which could not scratch any other, was placed at the bottom of the scale.<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">Hardness, then, is the material property that describes a substance&#8217;s ability to resist penetration by another solid material.<\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\">To determine hardness more precisely, a standardized test body is pressed into the surface with a defined force. The smaller the resulting indentation, the higher the material&#8217;s hardness. However, high hardness usually goes hand in hand with high brittleness, which can lead to fracture under sudden impact. Hardmetals combine the required hardness with the necessary toughness.<\/p>\n<h2>How Hardmetals and Their Coatings Are Made<\/h2>\n<p style=\"text-align: justify;\">To create a composite of metal and hard phases, the powdered hard materials are either mixed into molten metal or pressed together with metal powder and then sintered. To coat these materialss, <a href=\"https:\/\/kluthe.com\/en\/products\/surface-pretreatment\/\">surface technology<\/a> mainly uses chemical vapor deposition (CVD) or physical vapor deposition (PVD).<\/p>\n<p><a href=\"https:\/\/kluthe.com\/en\/products\/surface-pretreatment\/\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1874 size-full\" title=\"Surface pretreatment | protects metal surfaces against corrosion | ensures long-lasting durability\" src=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/oberflaechenvorbehandlung-1.jpg\" alt=\"surface-pretreatment-hardmetal-coating\" width=\"800\" height=\"553\" srcset=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/oberflaechenvorbehandlung-1.jpg 800w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/oberflaechenvorbehandlung-1-300x207.jpg 300w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/oberflaechenvorbehandlung-1-768x531.jpg 768w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/oberflaechenvorbehandlung-1-110x75.jpg 110w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\">Metal surfaces can also be provided with coatings through:<\/p>\n<ul>\n<li style=\"text-align: justify;\">Plasma-transferred arc welding<\/li>\n<li style=\"text-align: justify;\">High-velocity oxygen fuel spraying (HVOF)<\/li>\n<li style=\"text-align: justify;\">Arc spraying<\/li>\n<li style=\"text-align: justify;\">Laser spraying<\/li>\n<\/ul>\n<h2>Which Hardmetal Components Are Coated?<\/h2>\n<p style=\"text-align: justify;\">Hardmetal is inherently very wear-resistant. That is why heavily stressed components\u2014such as metal-cutting tools or valve inserts\u2014are often made from this material. The cutting edges of tools have a significant influence on dimensional accuracy, shape precision, and surface quality, and due to their geometry, are especially prone to wear. To achieve economically reasonable tool lifespans, these areas are coated with cutting materials. The main application is the coating of indexable inserts used for turning and milling tools.<\/p>\n<h2>Coating Hardmetals Using Chemical Vapor Deposition (CVD)<\/h2>\n<p style=\"text-align: justify;\">Chemical vapor deposition is a surface treatment method based on the reaction of a gas mixture with the material&#8217;s surface. The result is the formation of solid compounds that bond with the substrate. These reactions take place in a vacuum at temperatures between 1650\u00b0F and 2010\u00b0F. The resulting layers\u2014typically made of titanium nitride (TiN), aluminum oxide (Al\u2082O\u2083), or titanium carbonitride (TiCN)\u2014are extremely thin, uniform, and well-adhered.<\/p>\n<p style=\"text-align: justify;\">The process is particularly suitable for coating parts with complex geometries. However, the high thermal load can lead to distortion and microstructural changes in the base material. For this reason, PVD is more commonly used for this purpose.<\/p>\n<figure id=\"attachment_1880\" aria-describedby=\"caption-attachment-1880\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1880 size-full\" title=\"Viewing window of a vacuum deposition system\" src=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Sichtfenster-eines-Vakuumabscheidungssystems.jpg\" alt=\"Viewing window vacuum deposition system hardmetal coating\" width=\"800\" height=\"600\" srcset=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Sichtfenster-eines-Vakuumabscheidungssystems.jpg 800w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Sichtfenster-eines-Vakuumabscheidungssystems-300x225.jpg 300w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Sichtfenster-eines-Vakuumabscheidungssystems-768x576.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-1880\" class=\"wp-caption-text\">\u00a9 Yulia \u2013 stock.adobe.com<\/figcaption><\/figure>\n<h2>Coating Hardmetals Using Physical Vapor Deposition (PVD)<\/h2>\n<p style=\"text-align: justify;\">In physical vapor deposition, the coating materials are vaporized and then condensed onto the part surface under vacuum. Upon cooling, the desired coating\u2014again typically TiN, Al\u2082O\u2083, or TiCN\u2014is formed. The process temperature ranges from 750\u00b0F to 1110\u00b0F. The coating thickness is controlled by the deposition time and may range from a few nanometers up to several microns. However, coating thickness is limited\u2014if the layer becomes too thick, it may peel off.<\/p>\n<h2>Hardmetal Coatings on Metallic Substrates<\/h2>\n<p style=\"text-align: justify;\">Metals can be coated using thermal methods. In this case, powdered mixtures of metals and hard materials\u2014or semi-finished products\u2014are heated and applied to the metal surface. This allows cost-effective base materials such as steel or aluminum to be upgraded with high-performance, wear- and corrosion-resistant layers.<\/p>\n<figure id=\"attachment_1876\" aria-describedby=\"caption-attachment-1876\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1876 size-full\" title=\"T-beam in production\" src=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/T-Stahl-Traeger-in-der-Fertigung.jpg\" alt=\"T-beam production hardmetal coating\" width=\"800\" height=\"500\" srcset=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/T-Stahl-Traeger-in-der-Fertigung.jpg 800w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/T-Stahl-Traeger-in-der-Fertigung-300x188.jpg 300w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/T-Stahl-Traeger-in-der-Fertigung-768x480.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-1876\" class=\"wp-caption-text\">\u00a9 Anja \u2013 stock.adobe.com<\/figcaption><\/figure>\n<h2>Coating Metals Using Plasma-Transferred Arc Welding (PTA)<\/h2>\n<p style=\"text-align: justify;\">Plasma-transferred arc welding uses an electric arc to generate the heat required for surface coating. The arc forms in an inert gas (such as argon or neon) between two electrodes. The heat transforms the gas into plasma, which is a mixture of electrons, gas ions, and neutral gas atoms. This energy is sufficient to partially melt the metal surface and fully melt the hardmetal powder. The result is a surface layer that is metallurgically bonded to the base material.<\/p>\n<p style=\"text-align: justify;\">Advantages of this process include a high degree of automation and high deposition rates\u2014up to 44 lbs\/h.<\/p>\n<h2>Coating Metals Using High-Velocity Oxygen Fuel (HVOF) Spraying<\/h2>\n<p style=\"text-align: justify;\">In HVOF spraying, fuel is combusted with oxygen under high pressure in a combustion chamber. This generates extremely high temperatures\u2014over 5400\u00b0F\u2014that melt the hardmetal powder or rods. The molten particles are then accelerated to speeds of up to 1800 ft\/s through a nozzle and impact the base material.<\/p>\n<blockquote>\n<p style=\"text-align: justify;\">This creates highly adhesive and extremely dense coatings with thicknesses of just a few tenths of a millimeter\u2014typically 0.008 to 0.02 inches. Since the base material only heats up to around 390\u00b0F during this process, its internal structure remains unaffected.<\/p>\n<\/blockquote>\n<h2>Coating Metals Using Arc Spraying<\/h2>\n<p style=\"text-align: justify;\">Arc spraying is a surface coating technique in which the coating material is used in wire form and acts as the electrode. An electric arc burns between the two wires, generating temperatures of about 7200\u00b0F, causing the wire tips to melt. The molten material is atomized by a gas jet and sprayed onto the metal surface.<\/p>\n<p style=\"text-align: justify;\">For hard coating applications, cored wires filled with hard materials are used. The resulting layers\u2014ranging from 0.008 to 0.8 inches thick\u2014are significantly more porous than those produced by HVOF. However, arc spraying allows for very high deposition rates.<\/p>\n<h2>Coating Metals Using Laser Spraying<\/h2>\n<p style=\"text-align: justify;\">In laser spraying, a laser beam locally heats the base material until it begins to melt. A nozzle introduces the hardmetal powder directly into the melt zone, where it bonds with the base material. This process makes it possible to apply coatings with precisely defined contours\u2014such as on cutting edges of tools.<\/p>\n<figure id=\"attachment_1885\" aria-describedby=\"caption-attachment-1885\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1885 size-full\" title=\"Man welding ultraprecise small parts with a laser and microscope\" src=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Mann-schweisst-mit-einem-Laser-und-einem-Mikroskop-ultrapraezise-Kleinteile.jpg\" alt=\"Man welding ultraprecise small parts with laser microscope\" width=\"800\" height=\"534\" srcset=\"https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Mann-schweisst-mit-einem-Laser-und-einem-Mikroskop-ultrapraezise-Kleinteile.jpg 800w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Mann-schweisst-mit-einem-Laser-und-einem-Mikroskop-ultrapraezise-Kleinteile-300x200.jpg 300w, https:\/\/kluthe.com\/magazin\/wp-content\/uploads\/2020\/04\/Mann-schweisst-mit-einem-Laser-und-einem-Mikroskop-ultrapraezise-Kleinteile-768x513.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-1885\" class=\"wp-caption-text\">\u00a9 dizfoto1973 \u2013 stock.adobe.com<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00ab Your Options for Surface Coating \u00bb The term hardmetal coating can refer to two different processes: applying a hardmetal layer to conventional metals, or enhancing existing hardmetal components with highly wear-resistant materials. These composites consist of a metallic binder, known as the matrix, combined with hard non-metallic phases that provide the exceptional wear resistance. &hellip;<\/p>\n","protected":false},"author":1,"featured_media":7552,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10020","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-forming-protection-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hardmetal Coating - Kluthe Magazine<\/title>\n<meta name=\"description\" content=\"The Kluthe Magazine explores surface coating options for hardmetals \u2714 What exactly is a hardmetal coating?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kluthe.com\/magazin\/en\/hardmetal-coating\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hardmetal Coating - 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