{"id":10846,"date":"2025-04-09T16:53:34","date_gmt":"2025-04-09T16:53:34","guid":{"rendered":"https:\/\/ipsenglobal.com\/?post_type=knowledge-center&p=10846"},"modified":"2026-03-11T17:16:49","modified_gmt":"2026-03-11T17:16:49","slug":"ask-the-expert-discolored-parts-answer-these-questions-first","status":"publish","type":"knowledge-center","link":"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/ask-the-expert-discolored-parts-answer-these-questions-first\/","title":{"rendered":"Demandez \u00e0 l'expert : Les pi\u00e8ces sont-elles d\u00e9color\u00e9es ? R\u00e9pondez d'abord \u00e0 ces questions"},"content":{"rendered":"

L'une des questions les plus fr\u00e9quemment pos\u00e9es par les four \u00e0 vide<\/a> est \"Pourquoi mes pi\u00e8ces sont-elles d\u00e9color\u00e9es ?\" Bien que de nombreux clients pensent avoir test\u00e9 et inspect\u00e9 minutieusement leur \u00e9quipement avant de nous contacter, il y a souvent des zones qui peuvent \u00eatre n\u00e9glig\u00e9es au cours du processus d'inspection.<\/p>\n\n\n\n

Voici une liste de questions diagnostiques que vous devez vous attendre \u00e0 ce que nous posions chaque fois que nous recevons cet appel :<\/h5>\n\n\n\n
<\/div>\n\n\n\n
Collecte initiale de donn\u00e9es<\/h6>\n\n\n\n
    \n
  1. Quels sont les taux de fuite lin\u00e9aires \u00e0 froid et \u00e0 chaud du four ?<\/li>\n\n\n\n
  2. Le four atteint-il les niveaux de vide souhait\u00e9s et reste-t-il dans les limites des sp\u00e9cifications tout au long du cycle ?<\/li>\n<\/ol>\n\n\n\n
    D\u00e9finition de la d\u00e9coloration<\/h6>\n\n\n\n
      \n
    1. Qu'est-ce qui pr\u00e9sente des signes de d\u00e9coloration : la zone chaude, les parties ou les deux ?<\/li>\n\n\n\n
    2. Quelle couleur voyez-vous sur les pi\u00e8ces ou la zone chaude ? (vert, bleu, blanc, noir, etc.)<\/li>\n<\/ol>\n\n\n\n
      Inspection physique<\/h6>\n\n\n\n
        \n
      1. Quel est l'\u00e2ge et l'\u00e9tat de la zone sensible actuelle ?<\/li>\n\n\n\n
      2. Des odeurs anormales sont-elles perceptibles dans la zone chaude lorsque la porte du four est ouverte ?<\/li>\n\n\n\n
      3. Y a-t-il des signes d'arcs d'\u00e9l\u00e9ments chauffants et\/ou de mat\u00e9riaux fondus dans la zone chaude ?<\/li>\n\n\n\n
      4. Les parois froides du four sont-elles propres ou sales ?<\/li>\n\n\n\n
      5. Quel est l'\u00e9tat du joint de la porte du four ?<\/li>\n\n\n\n
      6. Avez-vous inspect\u00e9 et test\u00e9 le syst\u00e8me de pompage pour vous assurer qu'il fonctionne correctement et qu'il atteint les niveaux de vide sp\u00e9cifi\u00e9s ? Toutes les huiles de la pompe ont-elles un niveau correct et un aspect normal ?<\/li>\n<\/ol>\n\n\n\n
        Maintenance r\u00e9cente<\/h6>\n\n\n\n
          \n
        1. Le four a-t-il r\u00e9cemment fait l'objet d'un entretien programm\u00e9 ou non programm\u00e9 ?<\/li>\n\n\n\n
        2. Quand l'\u00e9changeur de chaleur a-t-il \u00e9t\u00e9 inspect\u00e9 et\/ou entretenu pour la derni\u00e8re fois ?<\/li>\n\n\n\n
        3. Quand le four a-t-il fait l'objet d'un cycle de nettoyage pour la derni\u00e8re fois ? Quelle est la fr\u00e9quence des cycles de nettoyage du four ? Quelles sont les temp\u00e9ratures, les dur\u00e9es et les pressions utilis\u00e9es pendant le cycle de nettoyage ?<\/li>\n<\/ol>\n\n\n\n
          R\u00e9vision du processus<\/h6>\n\n\n\n
            \n
          1. Les mat\u00e9riaux, les alliages ou les recettes ont-ils chang\u00e9 r\u00e9cemment ?<\/li>\n\n\n\n
          2. Le processus de nettoyage des pi\u00e8ces en amont, des paniers et\/ou des accessoires a-t-il \u00e9t\u00e9 modifi\u00e9 r\u00e9cemment ? Les paniers et les accessoires ont-ils \u00e9t\u00e9 correctement entretenus et ont-ils \u00e9t\u00e9 inspect\u00e9s ?<\/li>\n\n\n\n
          3. Les paniers, grilles et\/ou supports sont-ils utilis\u00e9s dans d'autres processus\/\u00e9quipements que ce four \u00e0 vide ?<\/li>\n<\/ol>\n\n\n\n
            D\u00e9tection des fuites<\/h6>\n\n\n\n
              \n
            1. Le d\u00e9tecteur de fuites est-il connect\u00e9 au syst\u00e8me de pompage ? \u00c0 quel endroit du syst\u00e8me est-il raccord\u00e9 ?<\/li>\n\n\n\n
            2. Avez-vous v\u00e9rifi\u00e9 que les conduites d'alimentation en gaz inerte ne pr\u00e9sentent pas de fuites ?<\/li>\n<\/ol>\n\n\n\n
              Tests de diagnostic<\/h6>\n\n\n\n
                \n
              1. Si vous ex\u00e9cutez un processus qui n'utilise pas la pression partielle, suivi d'un refroidissement sous vide \u00e0 la fin du cycle, le four produit-il des pi\u00e8ces propres ?<\/li>\n\n\n\n
              2. Avez-vous envelopp\u00e9 une pi\u00e8ce test dans une feuille de titane ou d'acier inoxydable (en fonction de la temp\u00e9rature du processus) pour d\u00e9terminer si c'est la pi\u00e8ce ou l'environnement du four qui g\u00e9n\u00e8re la contamination ?<\/li>\n\n\n\n
              3. Un \u00e9chantillon de la surface contamin\u00e9e a-t-il \u00e9t\u00e9 envoy\u00e9 au laboratoire pour un examen des oligo-\u00e9l\u00e9ments ? Quelles sont les conclusions du rapport qui a \u00e9t\u00e9 \u00e9tabli ?<\/li>\n<\/ol>\n\n\n\n
                \n \n T\u00e9l\u00e9chargez une liste imprimable ici. <\/a>\n <\/section>\n\n\n\n

                Au fur et \u00e0 mesure que vous parcourez cette liste de contr\u00f4le, plus vous fournirez de r\u00e9ponses, plus vite nos experts seront en mesure de vous aider \u00e0 trouver la solution.<\/p>\n\n\n\n

                Si vous vous retrouvez \u00e0 travailler sur cette liste de diagnostics et que vous d\u00e9cidez d'avoir besoin d'aide en cours de route, n'h\u00e9sitez pas \u00e0 nous contacter \u00e0 l'adresse suivante 844-Go-Ipsen<\/strong> ou en envoyant un courriel \u00e0 technical@ipsenusa.com<\/a>. Nous pouvons vous donner des conseils et des astuces, ou vous pouvez prendre rendez-vous avec l'un de nos techniciens de terrain qui vous aidera \u00e0 r\u00e9soudre les probl\u00e8mes et \u00e0 remettre votre chaudi\u00e8re en service dans les meilleurs d\u00e9lais.<\/p>\n\n\n\n

                Ce que la d\u00e9coloration nous apprend<\/h2>\n\n\n\n

                Jaune (du jaune paille au dor\u00e9) :<\/strong>
                Lorsque l'on utilise de l'argon, les parties jaunes indiquent une fuite d'air ou de gaz qui permet \u00e0 l'air atmosph\u00e9rique de se m\u00e9langer \u00e0 l'argon. Plus la fuite est importante, plus la coloration jaune est fonc\u00e9e. Au-del\u00e0 d'un certain niveau de fuite, les pi\u00e8ces peuvent devenir bleues au lieu d'\u00eatre jaunes.<\/p>\n\n\n\n

                \n

                Bleu (du bleu ciel au bleu nuit) :<\/strong>
                Lors de l'utilisation d'argon, les parties bleues indiquent des fuites d'air, des fuites de gaz ou des m\u00e9langes atmosph\u00e9riques de plus en plus importants. Lors de l'utilisation d'azote, les parties bleues signifient des fuites d'air plus petites. L\u00e0 encore, plus la couleur est fonc\u00e9e, plus la fuite est importante. Le bleu peut \u00e9galement indiquer une contamination par le cuivre.<\/p>\n<\/div>\n\n\n\n

                <\/div>\n\n\n\n
                \n

                Vert (de la chaux au vert for\u00eat) :<\/strong>
                Les parties vertes indiquent quelques probl\u00e8mes potentiels, notamment
                1. La porte du four est rest\u00e9e ouverte entre les cycles ou le four n'a pas \u00e9t\u00e9 maintenu sous vide pendant une p\u00e9riode prolong\u00e9e.
                2. Les pi\u00e8ces ont \u00e9t\u00e9 introduites dans le four alors qu'elles \u00e9taient excessivement humides ou avec des alliages de brasage humides.
                3. Le four a fonctionn\u00e9 \u00e0 haute temp\u00e9rature dans un vide intense, lib\u00e9rant le chrome des pi\u00e8ces et des accessoires.
                4. La zone chaude a absorb\u00e9 de la vapeur d'eau
                5. Il est possible qu'il y ait eu une contamination par le cuivre au cours du processus.
                6. Fuites de la chemise d'eau, fuites de l'\u00e9changeur de chaleur, traces d'eau, etc.<\/p>\n\n\n\n

                \"Graphite<\/figure>\n<\/div>\n\n\n\n
                <\/div>\n\n\n\n

                Noir (du gris clair au noir absolu) :<\/strong>
                Lors de l'utilisation d'argon, le noir peut indiquer une fuite importante dans le syst\u00e8me. Le noir peut \u00e9galement indiquer une contamination par le carbone dans le processus. Cela peut se produire pendant la c\u00e9mentation \u00e0 pression partielle, ou \u00eatre le r\u00e9sultat de pi\u00e8ces fuligineuses qui n'ont pas \u00e9t\u00e9 compl\u00e8tement nettoy\u00e9es avant le traitement thermique.<\/p>\n\n\n\n

                *Les couches de contamination inf\u00e9rieures \u00e0 0,1 \u03bcm sont transparentes et les yeux humains ne peuvent pas distinguer la couleur correctement. Les clients peuvent identifier la d\u00e9coloration en fonction de l'\u00e9paisseur de la couche de contamination dans la chambre de chauffe ou sur la pi\u00e8ce. Les aciers \u00e0 outils sont moins sensibles et peuvent \u00eatre trait\u00e9s thermiquement sous un faible niveau de vide. L'acier inoxydable et les superalliages sont sensibles aux moindres traces d'oxyg\u00e8ne dans le syst\u00e8me de vide.<\/p>\n\n\n\n

                \n\n\n\n

                Pour d'autres conseils utiles, consultez notre Page \"Demandez \u00e0 l'expert<\/a>.<\/p>\n\n\n\n

                Vous avez une question technique concernant le traitement thermique ou le fonctionnement et l'entretien des fours \u00e0 vide ?<\/h5>\n\n\n\n
                <\/div>\n\n\n\n
                \n \n Contacter un expert Ipsen <\/a>\n <\/section>","protected":false},"excerpt":{"rendered":"

                L'une des questions les plus fr\u00e9quemment pos\u00e9es par les op\u00e9rateurs de fours \u00e0 vide est la suivante : \"Pourquoi mes pi\u00e8ces sont-elles d\u00e9color\u00e9es ?\" Bien que de nombreux clients pensent avoir test\u00e9 et inspect\u00e9 minutieusement leur \u00e9quipement avant de l'utiliser, il n'en reste pas moins qu'ils ne sont pas satisfaits de la qualit\u00e9 des pi\u00e8ces.<\/p>","protected":false},"author":7,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"_tec_requires_first_save":true,"_searchwp_excluded":"","_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","_ecp_custom_2":"","footnotes":""},"categories":[112],"tags":[],"class_list":["post-10846","knowledge-center","type-knowledge-center","status-publish","hentry","category-ask-the-expert"],"acf":[],"yoast_head":"\nAsk the Expert: Parts Discolored? Answer These Questions First - Ipsen Global<\/title>\n<meta name=\"description\" content=\"Learn how to diagnose discolored parts in vacuum furnaces with these questions to identify causes like leaks, contamination & process issues.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ipsenglobal.com\/fr\/knowledge-center\/ask-the-expert-discolored-parts-answer-these-questions-first\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ask the Expert: Parts Discolored? 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