{"id":6630,"date":"2021-04-04T12:44:35","date_gmt":"2021-04-04T12:44:35","guid":{"rendered":"https:\/\/www.aluminaceramicball.com\/?p=6630"},"modified":"2021-04-12T06:48:34","modified_gmt":"2021-04-12T06:48:34","slug":"a-influencia-de-um-excesso-de-oxido-de-sodio-no-po-de-alumina-sobre-a-ceramica","status":"publish","type":"post","link":"https:\/\/www.aluminaceramicball.com\/pt\/a-influencia-de-um-excesso-de-oxido-de-sodio-no-po-de-alumina-sobre-a-ceramica\/","title":{"rendered":"A influ\u00eancia do excesso de \u00f3xido de s\u00f3dio no p\u00f3 de alumina na cer\u00e2mica"},"content":{"rendered":"

Alta temperatura p\u00f3 de alumina<\/a> \u00e9 feito de hidr\u00f3xido de alum\u00ednio industrial e bauxita, peneira molecular e bolas de moagem<\/a> como mat\u00e9rias-primas. \u00c9 calcinado num forno de t\u00fanel durante muito tempo a alta temperatura. Tem um elevado ponto de fus\u00e3o, excelente resist\u00eancia mec\u00e2nica, dureza, elevada resistividade e condutividade t\u00e9rmica. Pode ser amplamente utilizado em ind\u00fastrias como a do equipamento eletr\u00f3nico, cer\u00e2mica estrutural, materiais refract\u00e1rios, materiais resistentes ao desgaste e materiais de polimento. Ent\u00e3o, que efeito ter\u00e1 o teor excessivo de \u00f3xido de s\u00f3dio no p\u00f3 de alumina de alta temperatura na cer\u00e2mica?<\/p>\n

O efeito mais intuitivo de um teor demasiado elevado de \u00f3xido de s\u00f3dio no p\u00f3 de alumina \u00e9 a densidade da cer\u00e2mica, por isso, como \u00e9 que afecta a sua densidade?<\/p>\n

O Na2O \u00e9 um dos mais importantes indicadores de alta temperatura microp\u00f3 de alumina<\/a>O peraluminato de s\u00f3dio \u00e9 um composto de alumina, especialmente microp\u00f3 de alumina de alta temperatura utilizado na produ\u00e7\u00e3o de cer\u00e2mica. A alta temperatura, o Na2O e o Al2O3 combinam-se para formar um composto est\u00e1vel de peraluminato de s\u00f3dio Na2O-1 I Al2O3, que \u00e9 comummente referido como alumina em fase \u03b2. A sua estrutura \u00e9 uma estrutura em camadas soltas. Sob as condi\u00e7\u00f5es, a capacidade de combinar AI2O3 \u00e9 muito forte, a raz\u00e3o de massa de Na2O e A12O3 \u00e9 1:18.096, mesmo que exista uma pequena quantidade de Na2O, uma grande quantidade de \u03b2-fase A12O3 ser\u00e1 formada, afectando assim a densidade da cer\u00e2mica. Al\u00e9m disso, este composto tem uma elevada condutividade, atingindo 10 ~ S-cnl ~ a 300\u00b0C, o que afecta as propriedades el\u00e9ctricas do substrato cer\u00e2mico. Por conseguinte, o p\u00f3 de alumina para altas temperaturas utilizado na produ\u00e7\u00e3o de substratos cer\u00e2micos deve ser constitu\u00eddo por produtos de alumina com baixo teor de s\u00f3dio, ou seja, p\u00f3 de alumina para altas temperaturas com um teor de Na2O inferior a 0,1%.<\/p>","protected":false},"excerpt":{"rendered":"

High temperature alumina powder is made of industrial aluminum hydroxide and bauxite, molecular sieve and grinding balls as raw materials. It is calcined in a tunnel kiln for a long time at high temperature. It has a high melting point, excellent mechanical strength, hardness, high resistivity and Thermal conductivity. It can be widely used in 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