{"id":143,"count":1,"description":"
\r\n\r\n\"\"Ceramiche al nitruro di alluminio: Propriet\u00e0, applicazioni e approfondimenti sull'alta conducibilit\u00e0 termica<\/strong>\r\nChe cos'\u00e8 la ceramica al nitruro di alluminio?<\/strong>\r\nAluminum nitride (AlN) ceramic is a synthetic compound formed by applying high pressure in a vacuum furnace and sintering under a nitrogen atmosphere. It is commonly produced in the form of plates and structural components. Composed primarily of covalent bonds in a hexagonal wurtzite structure, aluminum nitride ceramics are non-toxic and environmentally safe.\r\nAlN ceramics exhibit higher flexural strength compared to functional ceramics such as dielectric ceramics and barium titanate ceramics. However, their strength is slightly lower than structural ceramics like zirconia and silicon nitride ceramics. Notably, aluminum nitride ceramics have a thermal expansion coefficient closely matching silicon and gallium nitride, making them highly compatible and suitable for integration into various systems. They demonstrate excellent thermal stability up to 800\u00b0C but begin to oxidize at temperatures beyond this threshold.\r\n\r\nAlN ceramics maintain high strength at room temperature and show very little loss of performance even as the temperature rises. For example, hot-pressed AlN can still hold a strength of around 500 MPa when heated to 1500\u00b0C. Due\u00a0to its high thermal conductivity combined with a low thermal expansion rate, AlN handles rapid temperature changes exceptionally well and is particularly suited for use in heat exchangers, including those found in gas turbines.\r\n\r\n<\/div>\r\nCONTATTACI<\/a>\r\n\r\nL'elevata conduttivit\u00e0 termica delle ceramiche al nitruro di alluminio<\/strong>\r\nThe high thermal conductivity of aluminum nitride ceramics is attributed to its unique phonon-based heat conduction mechanism. While single crystals can achieve thermal conductivity values as high as 319 W\/m\u00b7K, the thermal conductivity of sintered aluminum nitride ceramics ranges between 70 and 270 W\/m\u00b7K. Aluminum nitride ceramic substrates typically exhibit thermal conductivity in the range of 170 to 190 W\/m\u00b7K.\r\nDuring high-temperature sintering, lattice and oxygen defects may form, impacting thermal performance. To achieve higher thermal conductivity, it is crucial to minimize oxygen concentration during the sintering process. Research indicates that keeping the oxygen concentration below 0.75% at the atomic level reduces lattice defects, resulting in denser materials with enhanced thermal conductivity.\r\n\r\nCompared to traditional alumina substrates, which have a thermal conductivity of only 17\u201325 W\/(m\u00b7K), aluminum nitride offers a significantly higher thermal conductivity, roughly five to ten times greater.\u00a0Although beryllium oxide (BeO) offers thermal conductivity comparable to that of AlN, its toxicity is a major concern: inhalation of BeO dust can cause acute pneumonia or chronic beryllium lung disease.Although beryllium oxide (BeO) offers thermal conductivity comparable to that of AlN, its toxicity is a major concern: inhalation of BeO dust can cause acute pneumonia or chronic beryllium lung disease.\r\n\r\nLe propriet\u00e0 di <\/strong>Ceramica al nitruro di alluminio<\/strong>\u00a0(AlN\uff09)<\/strong>\r\n\r\nPropriet\u00e0 fisiche\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Propriet\u00e0<\/td>\r\nUnit\u00e0<\/td>\r\nValore<\/td>\r\n<\/tr>\r\n
Densit\u00e0 sinterizzata<\/td>\r\ng\/cm\u00b3<\/td>\r\n3.33<\/td>\r\n<\/tr>\r\n
Colore<\/td>\r\n<\/td>\r\ngrigio<\/td>\r\n<\/tr>\r\n
Assorbimento dell'acqua<\/td>\r\n%<\/td>\r\n0<\/td>\r\n<\/tr>\r\n
Struttura cristallina<\/td>\r\n<\/td>\r\nEsagonale<\/td>\r\n<\/tr>\r\n
pH<\/td>\r\n<\/td>\r\n6.3<\/td>\r\n<\/tr>\r\n
Durezza (@20\u2103)<\/td>\r\nMohs<\/td>\r\n7<\/td>\r\n<\/tr>\r\n
Durezza (@20\u2103)<\/td>\r\nHv<\/td>\r\n1100 - 1200<\/td>\r\n<\/tr>\r\n
Punto di fusione<\/td>\r\n\u2103<\/td>\r\n2200<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n \r\n\r\nPropriet\u00e0 meccaniche\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Propriet\u00e0<\/td>\r\nUnit\u00e0<\/td>\r\nValore<\/td>\r\n<\/tr>\r\n
Rapporto Poissons<\/td>\r\n<\/td>\r\n0.21<\/td>\r\n<\/tr>\r\n
Resistenza alla flessione<\/td>\r\nMPa<\/td>\r\n380 - 480<\/td>\r\n<\/tr>\r\n
Modulo di elasticit\u00e0 (@20\u2103\uff09)<\/td>\r\nGPa<\/td>\r\n310<\/td>\r\n<\/tr>\r\n
Modulo di taglio<\/td>\r\nGPa<\/td>\r\n128<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n \r\n\r\nPropriet\u00e0 termiche\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
propriet\u00e0<\/td>\r\nUnit\u00e0<\/td>\r\nValore<\/td>\r\n<\/tr>\r\n
Conduttivit\u00e0 termica (@20\u2103\uff09)<\/td>\r\nW\/m-K<\/td>\r\n175<\/td>\r\n<\/tr>\r\n
CTE, lineare (20-400\u00b0C)<\/td>\r\n1\/\u00b0C<\/td>\r\n4.6 x 10-\u2076<\/td>\r\n<\/tr>\r\n
CTE, lineare (20-1000\u00b0C)<\/td>\r\n1\/\u00b0C<\/td>\r\n5.6 x 10-\u2076<\/td>\r\n<\/tr>\r\n
Temperatura massima di utilizzo<\/td>\r\n\u2103<\/td>\r\n800<\/td>\r\n<\/tr>\r\n
Capacit\u00e0 termica specifica<\/td>\r\nJ\/g-\u00b0C<\/td>\r\n0.738<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n \r\n\r\nPropriet\u00e0 elettriche\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
propriet\u00e0<\/td>\r\nUnit\u00e0<\/td>\r\nValore<\/td>\r\n<\/tr>\r\n
Indice di perdita dielettrica<\/td>\r\n<\/td>\r\n0,0004\uff08 1e+6 Hz\uff09<\/td>\r\n<\/tr>\r\n
Rigidit\u00e0 dielettrica (@Th 1,50 mm)<\/td>\r\nkV\/mm<\/td>\r\n>= 13.3<\/td>\r\n<\/tr>\r\n
Resistivit\u00e0 di volume<\/td>\r\n\u03a9-cm<\/td>\r\n1.00 x 10\u00b9\u00b3<\/td>\r\n<\/tr>\r\n
Guasto dielettrico<\/td>\r\nkV\/mm<\/td>\r\n16<\/td>\r\n<\/tr>\r\n
Costante dielettrica (@ 20\u2103)<\/td>\r\nMHz<\/td>\r\n9<\/td>\r\n<\/tr>\r\n
Distanza tra le bande<\/td>\r\n\u03a9-cm<\/td>\r\n6.2<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n*The values represent typical material properties and may vary depending on product configuration and the manufacturing process,\r\nFor further information, do not hesitate to contattateci<\/a>.\r\n\r\nCONTATTACI<\/a>","link":"https:\/\/weiert-ceramics.com\/it\/materials\/aluminum-nitride-ceramic-aln\/","name":"Ceramica di nitruro di alluminio (AlN)","slug":"aluminum-nitride-ceramic-aln","taxonomy":"category","parent":111,"meta":[],"acf":[],"z_taxonomy_image_url":"https:\/\/weiert-ceramics.com\/wp-content\/uploads\/2025\/01\/97ad8aa725d220789d99-1.jpg","yoast_head":"\nAluminate Nitride Ceramic: Key Benefits and Uses - Weiert Ceramics Technology Co., Ltd.<\/title>\n<meta name=\"description\" content=\"Discover AlN ceramic, also known as aluminum nitride ceramic, known for its excellent thermal conductivity and environmental safety.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/weiert-ceramics.com\/it\/category\/faq\/ceramic-materials-knowledge-base\/ceramic-materials\/aluminum-nitride-ceramic-aln\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AlN Ceramic: Properties and Applications Guide\" \/>\n<meta property=\"og:description\" content=\"Discover Aluminum Nitride Ceramic properties, applications, and benefits. 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