{"id":18044,"date":"2022-08-24T01:56:01","date_gmt":"2022-08-24T01:56:01","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=18044"},"modified":"2022-08-24T07:09:19","modified_gmt":"2022-08-24T07:09:19","slug":"bn-coating-high-and-stable-quality","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/bn-coating-high-and-stable-quality\/","title":{"rendered":"Revestimento bn de alta qualidade e est\u00e1vel"},"content":{"rendered":"

Revestimento bn de alta qualidade e est\u00e1vel<\/a>, o conte\u00fado a seguir gira em torno desse tema.<\/p>\n

A liga de teste \u00e9 a T1-50% (fra\u00e7\u00e3o at\u00f4mica id\u00eantica \u00e0 da liga com mem\u00f3ria de forma abaixo), fornecida pelo Instituto de Pesquisa de Metais N\u00e3o Ferrosos de Pequim<\/p>\n

O teste de rea\u00e7\u00e3o de interface entre o inv\u00f3lucro e a liga de tit\u00e2nio foi realizado em um forno de aquecimento por indu\u00e7\u00e3o a v\u00e1cuo de fabrica\u00e7\u00e3o pr\u00f3pria: a liga de tit\u00e2nio foi aquecida em um cadinho de \u00f3xido de c\u00e1lcio, e o forno de indu\u00e7\u00e3o foi evacuado at\u00e9 7 Pa. Para evitar a descarga da bobina de indu\u00e7\u00e3o, o forno foi preenchido com arg\u00f4nio puro de alta press\u00e3o como g\u00e1s de prote\u00e7\u00e3o. A temperatura de fundi\u00e7\u00e3o da liga \u00e9 de 1.470 \u2103 e 1.600 \u2103, respectivamente, e a pe\u00e7a \u00e9 retirada quando a temperatura de fundi\u00e7\u00e3o \u00e9 reduzida \u00e0 temperatura ambiente. Para estudar a camada de rea\u00e7\u00e3o na superf\u00edcie da pe\u00e7a fundida, esta n\u00e3o foi submetida a jateamento de granalha nem decapagem; apenas a carca\u00e7a do molde foi limpa e, em seguida, amostrada por corte a fio.<\/p>\n

As amostras foram analisadas histologicamente utilizando um microsc\u00f3pio eletr\u00f4nico de varredura S-570 equipado com EDS e uma sonda eletr\u00f4nica JAX-8100.<\/p>\n

\"Revestimento
Revestimento bn de alta qualidade e est\u00e1vel<\/figcaption><\/figure>\n

1 Resultados dos testes e discuss\u00e3o<\/strong><\/p>\n

1.1 An\u00e1lise da interface de rea\u00e7\u00e3o entre o revestimento composto \u00e0 base de bn e a liga de tit\u00e2nio-n\u00edquel. O ponto de fus\u00e3o do T1<\/p>\n

A liga com mem\u00f3ria de forma 50%N tem ponto de transi\u00e7\u00e3o de 1321 \u2103. Neste experimento, amostras da liga com mem\u00f3ria de forma T1-50%1 foram preparadas em moldes compostos \u00e0 base de revestimento de bn a temperaturas de fundi\u00e7\u00e3o de 1470 e 1600 \u00b0C, respectivamente. A Figura 1 \u00e9 uma fotografia de baixa amplia\u00e7\u00e3o de pe\u00e7as fundidas de liga de tit\u00e2nio-n\u00edquel preparadas a partir de moldes compostos com revestimento de BN em diferentes temperaturas de fundi\u00e7\u00e3o. Pode-se observar que, na temperatura normal de fundi\u00e7\u00e3o de 1.470 \u00b0C, a superf\u00edcie da pe\u00e7a fundida de liga de tit\u00e2nio-n\u00edquel preparada pelo molde composto com revestimento de BN \u00e9 lisa e n\u00e3o h\u00e1 fen\u00f4meno de ader\u00eancia de areia, conforme mostrado na Figura 1(a). Isso demonstra que o molde composto com revestimento de BN apresenta boa resist\u00eancia ao choque t\u00e9rmico e \u00e0 eros\u00e3o por metal fundido, \u00e9 capaz de suportar a eros\u00e3o do metal fundido de liga de tit\u00e2nio em alta temperatura e apresenta boa capacidade de remodela\u00e7\u00e3o. Para investigar a rea\u00e7\u00e3o entre o molde composto com revestimento de BN e a liga de tit\u00e2nio-n\u00edquel sob superaquecimento extremo, a temperatura de fundi\u00e7\u00e3o foi aumentada para 600 \u2103.<\/p>\n

A Figura 2 \u00e9 uma imagem obtida por microsc\u00f3pio eletr\u00f4nico de varredura de se\u00e7\u00f5es transversais verticais de pe\u00e7as fundidas de tit\u00e2nio-n\u00edquel, fundidas em Revestimento bn de alta qualidade e est\u00e1vel<\/a>moldes compostos \u00e0 base de [material] por corte a fio em diferentes temperaturas de fundi\u00e7\u00e3o. Pode-se observar na figura que fases irregulares da liga de tit\u00e2nio est\u00e3o distribu\u00eddas na matriz das amostras preparadas em diferentes temperaturas, e que as pe\u00e7as fundidas de tit\u00e2nio-n\u00edquel apresentam boa compacta\u00e7\u00e3o, sem poros evidentes nem porosidade de contra\u00e7\u00e3o. N\u00e3o h\u00e1 inclus\u00f5es de part\u00edculas grandes na pe\u00e7a fundida (o tamanho das part\u00edculas de Y\u2082O\u2083 na camada superficial do revestimento do molde composto de alta qualidade e est\u00e1vel \u00e9 superior a 36 m, o tamanho das part\u00edculas de BN \u00e9 superior a 30 \u00b5m, e o tamanho das part\u00edculas de \u00f3xido de \u00edtrio para lixamento \u00e9 superior a 120 \u00b5m), indicando que o molde composto com revestimento apresenta excelente refratariedade. A 1.470 \u00b0C, o Revestimento bn de alta qualidade e est\u00e1vel<\/a>O molde composto \u00e0 base de BN e a liga de tit\u00e2nio fundida quase n\u00e3o reagem. Mesmo sob a a\u00e7\u00e3o abrasiva da liga de tit\u00e2nio-n\u00edquel fundida a 1.600 \u2103, n\u00e3o ocorreram problemas de descascamento ou desprendimento de part\u00edculas. Portanto, quando o molde composto com revestimento de BN \u00e9 utilizado na liga de tit\u00e2nio-n\u00edquel, ele pode n\u00e3o apenas garantir a forma do molde, mas tamb\u00e9m assegurar a pureza da pe\u00e7a fundida da liga.<\/p>","protected":false},"excerpt":{"rendered":"

bn coating high and stable quality\uff0c the following content revolves around this center. The test alloy is T1-50% (atomic fraction, the same as the shape…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[381],"tags":[13239,384],"class_list":["post-18044","post","type-post","status-publish","format-standard","hentry","category-boron-nitride-coating","tag-bn-coating-high-and-stable-quality","tag-boron-nitride-coating"],"yoast_head":"\nbn coating high and stable quality, boron nitride coating<\/title>\n<meta name=\"description\" content=\"bn coating high and stable quality, Analysis of the reaction interface between the bn coating-based composite.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/pt\/bn-coating-high-and-stable-quality\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta 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