{"id":56711,"date":"2024-04-15T02:56:10","date_gmt":"2024-04-15T07:56:10","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/beyond-pottery-the-science-behind-piezoceramic-materials\/"},"modified":"2025-01-27T06:01:46","modified_gmt":"2025-01-27T11:01:46","slug":"beyond-pottery-the-science-behind-piezoceramic-materials","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/beyond-pottery-the-science-behind-piezoceramic-materials\/","title":{"rendered":"Za hranicemi keramiky: V\u011bda o piezoelektrick\u00fdch materi\u00e1lech"},"content":{"rendered":"

Piezoelektrick\u00e9 materi\u00e1ly jsou fascinuj\u00edc\u00ed l\u00e1tky, kter\u00e9 nach\u00e1zej\u00ed uplatn\u011bn\u00ed v mnoha oblastech modern\u00ed technologie, sahaj\u00edc\u00edch daleko za tradi\u010dn\u00ed keramiku. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na v\u011bdeck\u00e9 principy, kter\u00e9 stoj\u00ed za jejich fungov\u00e1n\u00edm, a prozkoum\u00e1 jejich \u0161irok\u00e9 spektrum aplikac\u00ed.<\/p>\n

Piezoelektrick\u00fd efekt: Z\u00e1kladn\u00ed princip<\/h3>\n

Piezoelektrick\u00fd efekt je fyzik\u00e1ln\u00ed jev, kdy se v n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1lech, po aplikaci mechanick\u00e9ho tlaku, generuje elektrick\u00e9 nap\u011bt\u00ed. Naopak, p\u0159i aplikaci elektrick\u00e9ho pole se materi\u00e1l deformuje. Tato vz\u00e1jemn\u00e1 vazba mezi mechanickou a elektrickou energi\u00ed je z\u00e1kladem funk\u010dnosti piezokeramick\u00fdch materi\u00e1l\u016f. Nej\u010dast\u011bji pou\u017e\u00edvan\u00fdm materi\u00e1lem je titan\u00e1t barnat\u00fd (BaTiO\u2083) a zirkon\u00e1t olovnat\u00fd titan\u00e1t (PZT), ale existuj\u00ed i dal\u0161\u00ed, s r\u016fzn\u00fdmi vlastnostmi a aplikacemi. Intenzita generovan\u00e9ho nap\u011bt\u00ed nebo m\u00edra deformace z\u00e1vis\u00ed na vlastnostech materi\u00e1lu, velikosti aplikovan\u00e9 s\u00edly \u010di nap\u011bt\u00ed, a geometrii samotn\u00e9ho piezokeramick\u00e9ho prvku.<\/p>\n

Struktura a vlastnosti piezokeramick\u00fdch materi\u00e1l\u016f<\/h3>\n

Piezokeramick\u00e9 materi\u00e1ly jsou polykrystalick\u00e9 materi\u00e1ly, co\u017e znamen\u00e1, \u017ee jsou slo\u017eeny z mnoha mal\u00fdch krystal\u016f. Orientace t\u011bchto krystal\u016f ovliv\u0148uje celkov\u00e9 piezoelektrick\u00e9 vlastnosti materi\u00e1lu. Procesem poling (polarizace), kter\u00fd spo\u010d\u00edv\u00e1 v aplikaci siln\u00e9ho elektrick\u00e9ho pole p\u0159i vysok\u00e9 teplot\u011b, se krystaly uspo\u0159\u00e1daj\u00ed a zes\u00edl\u00ed se piezoelektrick\u00fd efekt.<\/p>\n\n\n\n\n\n\n
Materi\u00e1l<\/th>\nPiezoelektrick\u00fd koeficient (pC\/N)<\/th>\nDielektrick\u00e1 konstanta<\/th>\nCurieova teplota (\u00b0C)<\/th>\n<\/tr>\n<\/thead>\n
BaTiO\u2083<\/td>\n~190<\/td>\n~1700<\/td>\n~120<\/td>\n<\/tr>\n
PZT (Pb(ZrxTi1-x)O\u2083)<\/td>\n~200-700<\/td>\n~1000-3000<\/td>\n~300-500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Curieova teplota p\u0159edstavuje kritickou teplotu, nad kterou materi\u00e1l ztr\u00e1c\u00ed sv\u00e9 piezoelektrick\u00e9 vlastnosti.<\/p>\n

Aplikace piezokeramick\u00fdch materi\u00e1l\u016f<\/h3>\n

Piezokeramick\u00e9 materi\u00e1ly nach\u00e1zej\u00ed \u0161irok\u00e9 uplatn\u011bn\u00ed v mnoha oblastech, nap\u0159\u00edklad:<\/p>\n

    \n
  • Ultrazvukov\u00e9 senzory a aktu\u00e1tory:<\/strong> Piezokeramick\u00e9 prvky se pou\u017e\u00edvaj\u00ed v ultrazvukov\u00fdch sn\u00edma\u010d\u00edch pro l\u00e9ka\u0159sk\u00e9 zobrazov\u00e1n\u00ed, pr\u016fmyslovou kontrolu a dal\u0161\u00ed aplikace. V t\u011bchto aplikac\u00edch se vyu\u017e\u00edv\u00e1 schopnost piezokeramick\u00fdch materi\u00e1l\u016f generovat a detekovat ultrazvukov\u00e9 vlny. Nap\u0159\u00edklad, syst\u00e9my pro ultrazvukov\u00e9 \u010di\u0161t\u011bn\u00ed vyu\u017e\u00edvaj\u00ed generov\u00e1n\u00ed vysokofrekven\u010dn\u00edch vibrac\u00ed k odstra\u0148ov\u00e1n\u00ed ne\u010distot. V n\u011bkter\u00fdch p\u0159\u00edpadech je pro dosa\u017een\u00ed specifick\u00fdch parametr\u016f nutn\u00e9 pou\u017eit\u00ed vysoce kvalitn\u00edch syst\u00e9m\u016f, jako jsou ty od firmy Beijing Ultrasonic.<\/li>\n
  • Akcelerometry a senzory tlaku:<\/strong> Piezoelektrick\u00fd efekt umo\u017e\u0148uje m\u011b\u0159it mechanick\u00e9 s\u00edly a vibrace s vysokou p\u0159esnost\u00ed.<\/li>\n
  • Piezoelektrick\u00e9 zapalova\u010de:<\/strong> V t\u011bchto za\u0159\u00edzen\u00edch se mechanick\u00e1 energie stla\u010den\u00ed krystalu p\u0159em\u011bn\u00ed na elektrickou jiskru.<\/li>\n
  • Akt\u00edvn\u00ed tlumen\u00ed vibrac\u00ed:<\/strong> Piezoelektrick\u00e9 aktu\u00e1tory mohou generovat s\u00edly, kter\u00e9 kompenzuj\u00ed ne\u017e\u00e1douc\u00ed vibrace v r\u016fzn\u00fdch mechanick\u00fdch syst\u00e9mech.<\/li>\n<\/ul>\n

    V\u00fdzkum a v\u00fdvoj<\/h3>\n

    V\u00fdzkum v oblasti piezokeramick\u00fdch materi\u00e1l\u016f se zam\u011b\u0159uje na v\u00fdvoj nov\u00fdch materi\u00e1l\u016f s vylep\u0161en\u00fdmi vlastnostmi, jako je vy\u0161\u0161\u00ed piezoelektrick\u00fd koeficient, vy\u0161\u0161\u00ed Curieova teplota a lep\u0161\u00ed odolnost proti mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed. Hled\u00e1n\u00ed nov\u00fdch materi\u00e1l\u016f, kter\u00e9 by nahradily ty obsahuj\u00edc\u00ed olovo (kv\u016fli environment\u00e1ln\u00edm probl\u00e9m\u016fm), je tak\u00e9 d\u016fle\u017eit\u00fdm aspektem sou\u010dasn\u00e9ho v\u00fdzkumu.<\/p>\n

    Piezokeramick\u00e9 materi\u00e1ly p\u0159edstavuj\u00ed kl\u00ed\u010dovou technologii v mnoha oblastech modern\u00ed technologie. Jejich unik\u00e1tn\u00ed vlastnosti a \u0161irok\u00e9 spektrum aplikac\u00ed zaru\u010duj\u00ed, \u017ee budou hr\u00e1t st\u00e1le d\u016fle\u017eit\u011bj\u0161\u00ed roli v budouc\u00edm technologick\u00e9m v\u00fdvoji.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Piezoelektrick\u00e9 materi\u00e1ly jsou fascinuj\u00edc\u00ed l\u00e1tky, kter\u00e9 nach\u00e1zej\u00ed uplatn\u011bn\u00ed v mnoha oblastech modern\u00ed technologie, sahaj\u00edc\u00edch daleko za tradi\u010dn\u00ed keramiku. Tento \u010dl\u00e1nek se zam\u011b\u0159\u00ed na v\u011bdeck\u00e9 principy, kter\u00e9 stoj\u00ed za jejich fungov\u00e1n\u00edm, a prozkoum\u00e1 jejich \u0161irok\u00e9 spektrum aplikac\u00ed. Piezoelektrick\u00fd efekt: Z\u00e1kladn\u00ed princip Piezoelektrick\u00fd efekt je fyzik\u00e1ln\u00ed jev, kdy se v n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1lech, po aplikaci mechanick\u00e9ho tlaku,<\/p>\n","protected":false},"author":1,"featured_media":23771,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-56711","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\/56711","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=56711"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/56711\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/23771"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=56711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=56711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=56711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}