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| The work focuses on the syntheses of red inorganic ceramic pigments by inclusion of hematite in a fumed silica matrix. Leaching tests in boiling solutions of concentrated (36 wt%) hydrochloric acid demonstrated that, starting from mixtures of fumed silica and synthetic goethite, the occlusion of hematite occurs by calcination at 1150 ¨C1200¡ãC for 2¨C 4 h. Better results were obtained by using fumed silica having surface area ranging from 300 to 400 m2/g. A continuos change in colour was measured by comparing L-a-b values of the calcined samples and more information were obtained by the Kubelka- Munk absorption function. Because its chemical and thermal stability, the obtained heteromorphic pigment may be considered a suitable red pigment for ceramic manufacturing by fast firing cycles. |
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The work focuses on the syntheses of red inorganic ceramic pigments by inclusion of hematite in a fumed silica matrix. Leaching tests in boiling solutions of concentrated (36 wt%) hydrochloric acid demonstrated that, starting from mixtures of fumed silica and synthetic goethite, the occlusion of hematite occurs by calcination at 1150 ¨C1200¡ãC for 2¨C 4 h. Better results were obtained by using fumed silica having surface area ranging from 300 to 400 m2/g. A continuos change in colour was measured by comparing L-a-b values of the calcined samples and more information were obtained by the Kubelka- Munk absorption function. Because its chemical and thermal stability, the obtained heteromorphic pigment may be considered a suitable red pigment for ceramic manufacturing by fast firing cycles. ±¾¹¤×÷ÖØµãÊǽ«³àÌú¿ó(·Û)°üÔÚÞ¹¹ýµÄ¹èʯ»ùÖÊÖÐÒԺϳɺìÉ«ÎÞ»úÌÕ´ÉÑÕÁÏ¡£·ÐŨÑÎËá(36 wt%)½þ³öÊÔÑé±íÃ÷£¬½«Þ¹¹ýµÄ¹èʯºÍÈ˹¤ºÏ³ÉÕëÌú¿óµÄ»ìºÏÎïÔÚ 1150~1200¡ãC µÄζÈÏÂìÑÉÕ 2~4 Сʱ¾Í¿É·¢Éú³àÌú¿óÎüÁô£¨°ü²Ø£©¡£Ê¹ÓñȱíÃæ»ý300~400m2/gµÄ¹èʯЧ¹û¸üºÃ¡£ ±È½ÏìÑÉÕÑùÆ·µÄL-a-bµÄÊýÖµ¿É²â³ö²úÆ·ÑÕÉ«µÄÁ¬Ðø±ä»¯£¬¸ü¶àµÄÐÅÏ¢¿Éͨ¹ý Kubelka- Munk Îü¸½º¯Êý»ñµÃ¡£ÓÉÓÚ(²úÆ·µÄ)¿¹¸¯Ê´Ä͸ßΣ¨»¯Ñ§ºÍÈÈѧµÄÁ¼ºÃÎȶ¨ÐÔ£©£¬(Ëù»ñµÃµÄ)ÕâÖֶྦྷÐÍÑÕÁÏ¿ÉÈÏΪÊÇÒ»ÖÖÊÊÓÃÓÚÌÕ´É¿ìËÙÉÕÖÆÉú²úµÄºìÉ«ÑÕÁÏ¡£ |
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