{"id":60941,"date":"2023-04-21T14:54:57","date_gmt":"2023-04-21T19:54:57","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-long-do-piezoelectric-crystals-last\/"},"modified":"2025-01-27T06:06:39","modified_gmt":"2025-01-27T11:06:39","slug":"how-long-do-piezoelectric-crystals-last","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/how-long-do-piezoelectric-crystals-last\/","title":{"rendered":"\u017divotnost piezoelektrick\u00fdch krystal\u016f: Jak dlouho vydr\u017e\u00ed?"},"content":{"rendered":"<p>Piezokrystalick\u00e9 materi\u00e1ly nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha technologi\u00edch, od zapalova\u010d\u016f a\u017e po vysoce p\u0159esn\u00e9 m\u011b\u0159ic\u00ed p\u0159\u00edstroje.  Ot\u00e1zka jejich \u017eivotnosti je proto kl\u00ed\u010dov\u00e1 pro pochopen\u00ed spolehlivosti a efektivity t\u011bchto aplikac\u00ed.  \u017divotnost piezoelektrick\u00fdch krystal\u016f nen\u00ed pevn\u011b dan\u00e1 a z\u00e1vis\u00ed na mnoha faktorech, kter\u00e9 podrobn\u011bji rozebereme v n\u00e1sleduj\u00edc\u00edm textu.<\/p>\n<p>Vliv mechanick\u00e9ho nam\u00e1h\u00e1n\u00ed<\/p>\n<p>Mechanick\u00e9 nam\u00e1h\u00e1n\u00ed je jedn\u00edm z hlavn\u00edch faktor\u016f ovliv\u0148uj\u00edc\u00edch \u017eivotnost piezoelektrick\u00fdch krystal\u016f.  P\u0159esn\u00e9 \u010d\u00edslo cykl\u016f, kter\u00e9 krystal vydr\u017e\u00ed, ne\u017e dojde k jeho degradaci, je velmi variabiln\u00ed a z\u00e1vis\u00ed na druhu materi\u00e1lu, velikosti krystalu, a amplitud\u011b a frekvenci mechanick\u00e9ho nam\u00e1h\u00e1n\u00ed.  P\u0159\u00edli\u0161 velk\u00e9 s\u00edly mohou v\u00e9st k prasknut\u00ed nebo zlomen\u00ed krystalu. Opakovan\u00e9 nam\u00e1h\u00e1n\u00ed, i kdy\u017e je pod mez\u00ed pevnosti, m\u016f\u017ee v\u00e9st k \u00fanavov\u00fdm jev\u016fm a postupn\u00e9mu sni\u017eov\u00e1n\u00ed piezoelektrick\u00e9ho efektu.<\/p>\n<p>Vliv teplotn\u00edch zm\u011bn<\/p>\n<p>Teplotn\u00ed zm\u011bny mohou tak\u00e9 negativn\u011b ovlivnit \u017eivotnost piezoelektrick\u00fdch krystal\u016f.  Extr\u00e9mn\u00ed teploty mohou zp\u016fsobit zm\u011bny ve struktu\u0159e krystalu, co\u017e vede ke sn\u00ed\u017een\u00ed jeho piezoelektrick\u00e9 aktivity a mechanick\u00e9 odolnosti.  Rychl\u00e9 zm\u011bny teplot mohou v\u00e9st k teplotn\u00edmu \u0161oku a vzniku trhlin.  Optim\u00e1ln\u00ed provozn\u00ed teplota se li\u0161\u00ed v z\u00e1vislosti na pou\u017eit\u00e9m materi\u00e1lu.<\/p>\n<p>Vliv vlhkosti a prost\u0159ed\u00ed<\/p>\n<p>Vlhkost a expozice agresivn\u00edm chemik\u00e1li\u00edm mohou urychlit degradaci piezoelektrick\u00fdch krystal\u016f.  Voda m\u016f\u017ee pronikat do struktury krystalu a zp\u016fsobovat korozi, kter\u00e1 sni\u017euje jeho \u00fa\u010dinnost a \u017eivotnost.  Pou\u017eit\u00ed ochrann\u00fdch povlak\u016f m\u016f\u017ee v mnoha p\u0159\u00edpadech prodlou\u017eit \u017eivotnost krystal\u016f v n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch.<\/p>\n<p>Porovn\u00e1n\u00ed \u017eivotnosti r\u016fzn\u00fdch materi\u00e1l\u016f<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>Typick\u00e1 \u017eivotnost (cykl\u016f)<\/th>\n<th>Citlivost na mechanick\u00e9 nam\u00e1h\u00e1n\u00ed<\/th>\n<th>Citlivost na teplotu<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>K\u0159emen (kvarc)<\/td>\n<td>&gt;109<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>St\u0159edn\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Keramika (PZT)<\/td>\n<td>106 &#8211; 108<\/td>\n<td>St\u0159edn\u00ed<\/td>\n<td>Vysok\u00e1<\/td>\n<\/tr>\n<tr>\n<td>N\u011bkter\u00e9 polymery<\/td>\n<td>105 &#8211; 107<\/td>\n<td>Vysok\u00e1<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><em>Pozn\u00e1mka:<\/em>  Uveden\u00e9 hodnoty jsou pouze orienta\u010dn\u00ed a skute\u010dn\u00e1 \u017eivotnost se m\u016f\u017ee zna\u010dn\u011b li\u0161it v z\u00e1vislosti na specifick\u00fdch podm\u00ednk\u00e1ch provozu.<\/li>\n<\/ul>\n<p>Prevence p\u0159ed\u010dasn\u00e9ho po\u0161kozen\u00ed<\/p>\n<p>Prodlou\u017een\u00ed \u017eivotnosti piezoelektrick\u00fdch krystal\u016f je mo\u017en\u00e9 dosa\u017een\u00ed vhodn\u00fdmi preventivn\u00edmi opat\u0159en\u00edmi.  Pat\u0159\u00ed sem spr\u00e1vn\u00fd v\u00fdb\u011br materi\u00e1lu s ohledem na podm\u00ednky pou\u017eit\u00ed, minimalizace mechanick\u00e9ho nam\u00e1h\u00e1n\u00ed, udr\u017eov\u00e1n\u00ed stabiln\u00ed teploty a vlhkosti a ochrana p\u0159ed agresivn\u00edmi l\u00e1tkami.  V aplikac\u00edch s vysok\u00fdm mechanick\u00fdm nam\u00e1h\u00e1n\u00edm se \u010dasto pou\u017e\u00edvaj\u00ed zes\u00edlen\u00e9 konstrukce a ochrann\u00e9 prvky.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee \u017eivotnost piezoelektrick\u00fdch krystal\u016f je zna\u010dn\u011b prom\u011bnliv\u00e1 a z\u00e1vis\u00ed na cel\u00e9 \u0159ad\u011b faktor\u016f.  Pochopen\u00ed t\u011bchto faktor\u016f a implementace vhodn\u00fdch preventivn\u00edch opat\u0159en\u00ed je kl\u00ed\u010dov\u00e9 pro zaji\u0161t\u011bn\u00ed dlouhodob\u00e9 funk\u010dnosti a spolehlivosti za\u0159\u00edzen\u00ed vyu\u017e\u00edvaj\u00edc\u00edch piezoelektrick\u00fd efekt.  Spr\u00e1vn\u00fd v\u00fdb\u011br materi\u00e1lu a konstrukce je nezbytn\u00fd pro optimalizaci \u017eivotnosti a efektivity t\u011bchto cenn\u00fdch komponent.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezokrystalick\u00e9 materi\u00e1ly nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha technologi\u00edch, od zapalova\u010d\u016f a\u017e po vysoce p\u0159esn\u00e9 m\u011b\u0159ic\u00ed p\u0159\u00edstroje. Ot\u00e1zka jejich \u017eivotnosti je proto kl\u00ed\u010dov\u00e1 pro pochopen\u00ed spolehlivosti a efektivity t\u011bchto aplikac\u00ed. \u017divotnost piezoelektrick\u00fdch krystal\u016f nen\u00ed pevn\u011b dan\u00e1 a z\u00e1vis\u00ed na mnoha faktorech, kter\u00e9 podrobn\u011bji rozebereme v n\u00e1sleduj\u00edc\u00edm textu. Vliv mechanick\u00e9ho nam\u00e1h\u00e1n\u00ed Mechanick\u00e9 nam\u00e1h\u00e1n\u00ed je jedn\u00edm z hlavn\u00edch<\/p>\n","protected":false},"author":1,"featured_media":26468,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-60941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60941","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=60941"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/60941\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26468"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=60941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=60941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=60941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}