{"id":1156,"date":"2015-08-26T00:20:47","date_gmt":"2015-08-25T22:20:47","guid":{"rendered":"http:\/\/new.buehrer-ag.ch\/en\/hochgeschwindigkeitsflammspritzen-hvof\/"},"modified":"2015-08-26T00:51:17","modified_gmt":"2015-08-25T22:51:17","slug":"hvof-high-velocity-oxygen-fuel-spraying","status":"publish","type":"page","link":"https:\/\/www.buehrer-ag.ch\/en\/hvof-high-velocity-oxygen-fuel-spraying\/","title":{"rendered":"HVOF (high velocity oxygen fuel spraying)"},"content":{"rendered":"<p>[vc_row][vc_column][vc_empty_space][vc_column_text]<\/p>\n<p><strong>High Velocity Oxy-Fuel<\/strong> (HVOF) thermal spray technology is a <strong>dry process<\/strong> that produces a dense metal coating. HVOF is a technique where a very high velocity is used to propel the particles at near <strong>supersonic speeds<\/strong> before impact onto the substrate. One of the key benefits of this system&#8217;s high velocity is the <strong>extremely high coating density<\/strong> and low oxide content. Properties include also good <strong>wear resistance, corrosion resistance, low stress, low porosity<\/strong>, and <strong>high bonding strength<\/strong> to the base metal.<\/p>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column width=&#8221;1\/2&#8243;][vc_video link=&#8221;https:\/\/www.youtube.com\/watch?v=XiPP0a3rASw&#8221;][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<p><strong>How does HVOF work?<\/strong><\/p>\n<p>[\/vc_column_text][vc_gallery type=&#8221;image_grid&#8221; images=&#8221;1158&#8243; img_size=&#8221;393&#215;224&#8243;][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]HVOF is a supersonic process and can exceed bond strengths of 8.4 kg\/mm2. It is an extremely versatile system that offers an unlimited range of possibilities to industries with extreme corrosion and wear environments. The thermal spray uses a fuel (i.e., propylene, hydrogen, propane, kerosene) oxygen mixture in a combustion chamber.\u00a0Combustion temperature is between 2760\u00b0C to 3320\u00b0C depending on fuel (we use propane, 3&#8217;160\u00b0C).<\/p>\n<p>This combustion process melts a metal powder that is continually fed into a gun using a carrier gas (argon) and propels it at high speeds 550m\/sec towards the surface of the part to be coated. The high speed of the spray produces a coating upon impact that can be used as an alternative to the hard chrome plating (HCP) process.<\/p>\n<p>The metal powder is available in many compositions, including: nickel, nichrome, inconel, chrome carbide, and tungsten carbide. With both thermal and kinetic energy, the high velocity particles are practically embedded into the substrate to form a superior coating with the following characteristics.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_tta_tour][vc_tta_section title=&#8221;Coating characteristics&#8221; tab_id=&#8221;coating-characteristics&#8221;][vc_column_text]<\/p>\n<ul>\n<li><strong>High Density<\/strong>\u00a0The coatings produced though HVOF develop very high densities<\/li>\n<li><strong>High Bond Strengths<\/strong> (in excess of 8.4 kg\/mm2)<\/li>\n<li><strong>Zero Porosity<\/strong> (with no interconnecting porosity)<\/li>\n<li><strong>Good Metal Working Capabilities<\/strong><\/li>\n<li><strong>Essentially Stress Free<\/strong><\/li>\n<li><strong>Greater Hardness<\/strong><\/li>\n<li><strong>Greater Thickness<\/strong><\/li>\n<li><strong>Low Thermal Input<\/strong> (substrate temperature less than 150 degrees Celsius which insures original mechanical properties, no stress relieving required)<\/li>\n<\/ul>\n<p>The properties of HVOF coatings are highly dependent on a number of parameters including the preparation of the part surface, composition, morphology, size distribution and feed rate of the powder, and the precise control of gas flows, relative torch\/part motions, stand-off angle of deposition and part temperature. We will gladly take that part for you.<\/p>\n<p>Typical coating thicknesses range from about 50 to 500 \u00b5m, but both thicker and thinner coatings are used on occasion depending on the specific application.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;Benefits&#8221; tab_id=&#8221;benefits&#8221;][vc_column_text]<\/p>\n<ul>\n<li>Multiple choice of coating materials.<\/li>\n<li>Surface coating physical properties are at least equal to those of HCP, and often exceed HCP in corrosion protection, abrasive wear resistance, and adhesive wear resistance.<\/li>\n<li>A major attribute of this technology is the ability to apply coatings with high melting points to substrates (workpiece or part) without significantly heating the substrate.<\/li>\n<li>Standard production coatings include pure metals and metallic alloys such as nickel or nichrome, cermets such as tungsten carbide-cobalt, and many ceramics.<\/li>\n<li>These coatings are used in many industries<\/li>\n<\/ul>\n<p>If you need to maximize the life of your present or future equipment, than HVOF maybe the answer to your particular problems.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;Environmental friendly&#8221; tab_id=&#8221;environmental-friendly&#8221;][vc_column_text]The only waste stream produced by HVOF is from the capture of the overspray. Current systems use a dry cartridge filter system with an optional high efficiency particulate air (HEPA) filter.<\/p>\n<p>Since the overspray contains only the pure metal or alloy, it is feasible to recycle or reclaim this waste stream. Traditional plating operations such as hard chrome plating (HCP) generate a large volume of hazardous waste from contaminated plating bath solutions and rinse waters.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=&#8221;Safety and Health&#8221; tab_id=&#8221;safety-and-health&#8221;][vc_column_text]<\/p>\n<p>We use inhalation protective equipment when working with fine particulate matter that consists of various compositions of different metals.<\/p>\n<p>[\/vc_column_text][\/vc_tta_section][\/vc_tta_tour][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_empty_space][vc_column_text] High Velocity Oxy-Fuel (HVOF) thermal spray technology is a dry process that produces a dense metal coating. HVOF is a technique where a very high velocity is used to propel the particles at near supersonic speeds before impact onto the substrate. One of the key benefits of this system&#8217;s high velocity is the extremely<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1156","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/pages\/1156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/comments?post=1156"}],"version-history":[{"count":5,"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/pages\/1156\/revisions"}],"predecessor-version":[{"id":1162,"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/pages\/1156\/revisions\/1162"}],"wp:attachment":[{"href":"https:\/\/www.buehrer-ag.ch\/en\/wp-json\/wp\/v2\/media?parent=1156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}