{"id":159112,"date":"2021-07-21T14:28:22","date_gmt":"2021-07-21T12:28:22","guid":{"rendered":"https:\/\/bandelin.com\/?post_type=docs&p=159112"},"modified":"2021-07-21T14:28:24","modified_gmt":"2021-07-21T12:28:24","password":"","slug":"kavitationserosion","status":"publish","type":"docs","link":"https:\/\/bandelin.com\/da\/docs\/wissen\/kavitationserosion\/","title":{"rendered":"Kavitationserosion"},"content":{"rendered":"
\n

Erosion p\u00e5 grund af kavitation i ultralydsbade<\/h2>\n\n\n\n

Kavitation<\/strong>
Ultralydsoscillerende systemer, der er fastgjort til den oscillerende tank i et ultralydsbad, omdanner elektrisk h\u00f8jfrekvensenergi til mekaniske svingninger og f\u00e5r badev\u00e6sken til at svinge med en bestemt frekvens (i omr\u00e5det 20 til 50 kHz). Det skaber undertrykszoner i v\u00e6sken, hvor der dannes bittesm\u00e5 vakuumbobler, som imploderer igen. Denne proces kaldes kavitation.<\/p>\n\n\n\n

Erosion p\u00e5 grund af kavitation<\/strong>
I princippet angriber kavitation alle materialer. Ved gr\u00e6nsefladen - fast\/flydende - angriber kavitationsboblerne overfladen p\u00e5 de svage punkter i det faste stof (f.eks. korngr\u00e6nser i den krystallinske metalstruktur). Dette er kendt som kavitationserosion og varierer i intensitet afh\u00e6ngigt af materialet.<\/p>\n\n\n\n

Dele, der uds\u00e6ttes for ultralyd, p\u00e5virkes af kavitation i l\u00f8bet af den korte sonikeringstid. Derved opn\u00e5s den \u00f8nskede positive effekt uden at angribe overfladen p\u00e5 det materiale, der skal sonikeres. Overfladen p\u00e5 den oscillerende tank (is\u00e6r den lydafgivende overflade) uds\u00e6ttes derimod for kavitation over en lang periode. Kavitationserosion kan blive synlig efter blot et par timers drift.<\/p>\n\n\n\n

For at forhindre hurtig slitage af den oscillerende tank bruger BANDELIN rustfrit st\u00e5l til fremstilling af sine oscillerende ultralydstanke. Det har vist sig at have de mest fordelagtige egenskaber mod kavitationsangreb. Rustfrit st\u00e5l er et st\u00e5l legeret med mindst 12 % krom og andre metalliske tils\u00e6tningsstoffer som nikkel, molybd\u00e6n osv. Kromlegeringen beskytter mod for tidlige kavitationsangreb og \u00f8ger levetiden for de lydafgivende overflader betydeligt.<\/p>\n\n\n\n

Andre faktorer, der p\u00e5virker kavitationserosion p\u00e5 overfladerne af den oscillerende tank, er<\/strong><\/p>\n\n\n\n

- Egenskaber ved den anvendte v\u00e6ske<\/p>\n\n\n\n

- Aggressiv badev\u00e6ske (f.eks. saltopl\u00f8sninger, visse syrer og baser i varierende koncentrationer)<\/p>\n\n\n\n

- Fuldt demineraliseret vand (demineraliseret vand) uden tils\u00e6tningsstoffer<\/p>\n\n\n\n

- Koncentration af pr\u00e6paratet (overhold den dosering, der er foreskrevet af producenten!)<\/p>\n\n\n\n

- Temperatur og gasindhold i v\u00e6sken<\/p>\n\n\n\n

- Forurening for\u00e5rsaget af metalsp\u00e5ner, sandkorn, slibemidler eller metalst\u00f8v eller af kemiske stoffer som olie, fedt osv.<\/p>\n\n\n\n

- Aggressive urenheder som syrer, salte og kloridioner<\/p>\n\n\n\n

- Kemikalier, der indeholder eller frigiver kloridioner (nogle desinfektionsmidler, husholdningsreng\u00f8ringsmidler og opvaskemidler)<\/p>\n\n\n\n

- Metode til lydforst\u00e6rkning 
Brug det passende tilbeh\u00f8r til opgaven, og undg\u00e5 direkte kontakt med bunden af bakken.<\/p>\n\n\n\n

Litteratur:
\/1\/ Prof. Dr. R. Pohlmann et al: Om ultralydskavitationsprocesser p\u00e5 faste overflader. 
Forskningsrapporter fra delstaten Nordrhein-Westfalen nr. 1444, (1965).
\/2\/ Ultralydsrensning. Galvanotechnik, Saulgau 69 (1978)10, s. 921.<\/p>\n\n\n\n

Alle oplysninger er baseret p\u00e5 vores nuv\u00e6rende viden, men udg\u00f8r ikke en garanti for produktegenskaber og etablerer ikke et kontraktligt juridisk forhold.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

Erosion durch Kavitation in Ultraschallb\u00e4dern KavitationAn der Schwingwanne eines Ultraschallbades angebrachte Ultraschall-Schwingsysteme wandeln elektrische Hoch-Frequenzenergie in mechanische Schwingungen um und bringen die Badfl\u00fcssigkeit mit einer vorgegebenen Frequenz (im Bereich von 20 bis 50 kHz) zum Schwingen. Dabei entstehen in der Fl\u00fcssigkeit Unterdruckzonen, in denen sich kleinste Vakuumbl\u00e4schen bilden, die wieder implodieren. Dieser Vorgang wird Kavitation […]<\/p>\n","protected":false},"author":3,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"doc_category":[1926],"doc_tag":[],"class_list":["post-159112","docs","type-docs","status-publish","hentry","doc_category-wissen"],"acf":[],"year_month":"2026-10","word_count":395,"total_views":"97","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"J Bandelin","author_nicename":"jobandelin","author_url":"https:\/\/bandelin.com\/da\/author\/jobandelin\/"},"doc_category_info":[{"term_name":"Grundlagenwissen Kavitation","term_url":"https:\/\/bandelin.com\/da\/docs-category\/wissen\/"}],"doc_tag_info":[],"yoast_head":"\nKavitationserosion | BANDELIN electronic GmbH & Co. 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