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TW201319008A - 鋁氧碳化物(aluminium oxycarbide)組成物及其製造方法與耐火物 - Google Patents

鋁氧碳化物(aluminium oxycarbide)組成物及其製造方法與耐火物 Download PDF

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Publication number
TW201319008A
TW201319008A TW101129527A TW101129527A TW201319008A TW 201319008 A TW201319008 A TW 201319008A TW 101129527 A TW101129527 A TW 101129527A TW 101129527 A TW101129527 A TW 101129527A TW 201319008 A TW201319008 A TW 201319008A
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Taiwan
Prior art keywords
aluminum oxycarbide
oxycarbide composition
raw material
aluminum
crystal
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TW101129527A
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English (en)
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TWI457312B (zh
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Keiichiro Akamine
Joki Yoshitomi
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Krosakiharima Corp
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Abstract

本發明提供一種可抑制使用中之Al4O4C之氧化,且可長時間持續Al4O4C之效果之鋁氧碳化物(aluminum oxycarbide)組成物。具有Al4O4C之結晶之鋁氧碳化物組成物中,以任意剖面觀察該鋁氧碳化物組成物時,Al4O4C之結晶之剖面積換算成圓時之平均直徑為20μm以上。該鋁氧碳化物組成物可在以電弧爐使碳質原料與氧化鋁質原料熔融後,於該電弧爐中冷卻而製造。

Description

鋁氧碳化物(aluminium oxycarbide)組成物及其製造方法與耐火物
本發明係關於陶瓷或耐火物、或作為該等之原料使用之鋁氧碳化物組成物及其製造方法、以及使用該鋁氧碳化物組成物之耐火物。
作為鋁氧碳化物,已知有Al2OC及Al4O4C的兩種。尤其Al4O4C具有在高溫下安定、具有抗氧化效果、耐腐蝕性優異、以及低熱膨脹率之特徵。為將來可期待作為耐火物或陶瓷或該等之原料之材料。尤其期待作為鐵鋼等之熔融金屬用之耐火物使用之氧化鋁碳質耐火物或氧化鎂碳質耐火物等之含碳耐火物之原料。
至於含該Al4O4C(鋁氧碳化物)之鋁氧碳化物組成物之製造方法,非專利文獻1中揭示在氬環境下熱處理氧化鋁與石墨之方法。具體而言,將乙醇添加於平均粒徑0.1μm之氧化鋁與粒徑為45μm以下之石墨試藥中,以瑪瑙研缽混合後,經乾燥,將混合物之粉體(2g)加入石墨坩堝中,使電爐內成真空後,送入氬氣且在1700℃燒成。且,非專利文獻2中揭示在電弧爐中製造鋁氧碳化物組成物之方法。但,非專利文獻2已指出以該製造方法獲得之鋁氧碳化物組成物之碳量變多時,容易與水反應而使Al4C3變多。
另一方面,專利文獻1中揭示均勻混合碳質原料與氧 化鋁,且C成分無偏差以抑制Al4C3之生成。
然而,Al4O4C已知在大氣中在約850℃下會氧化而氧化鋁化,Al4O4C之結晶粒子微細時,作為耐火物之原料使用時,會被氧化而使耐氧化性、耐腐蝕性、低熱膨脹率之效果難以長時間持續。
[先前技術文獻] [專利文獻]
[專利文獻1]國際公開第2010/113972號
[非專利文獻]
[非專利文獻1]耐火物 第59卷 288頁 2007年
[非專利文獻2]耐火物 第35卷 316頁 1983年
本發明欲解決之課題係提供一種可抑制使用中之Al4O4C之氧化,且可長時間持續Al4O4C之效果之鋁氧碳化物組成物及其製造方法,以及使用該鋁氧碳化物組成物之含碳耐火物。
本發明之鋁氧碳化物組成物為具有Al4O4C之結晶之鋁氧碳化物組成物,其特徵為在任意剖而觀察該鋁氧碳化物 組成物時,Al4O4C之結晶之剖面積換算成圓時之平均直徑為20μm以上。
本發明之鋁氧碳化物組成物較好含Al4O4C以外之剛玉(corundum)之結晶,且更好為剛玉之結晶與Al4O4C之結晶交互排列成層狀。又,本發明之鋁氧碳化物組成物除Al4O4C與剛玉以外,亦含少量之Al2OC或AlON等之氧氮化物、γ-Al2O3等。又,碳含量較好為3.2~6.3質量%以下。
用以製造上述之本發明之鋁氧碳化物組成物之本發明之製造方法之特徵為於電弧爐中使碳質原料與氧化鋁質原料熔融後,在該電弧爐內冷卻。
本發明之製造方法較好於前述碳質原料與前述氧化鋁質原料中,添加以外加比例計為0.2~10.0質量%之選自碳化矽、碳化硼、氮化鋁、氮化硼及金屬之一種以上,且,較好以使C成分之偏差在±10%以內之方式均勻的混合碳質原料、氧化鋁質原料、碳化矽等原料。
依據本發明,由於Al4O4C之結晶剖面積換算成圓時之平均直徑為20μm以上,故可抑制使用中之Al4O4C之氧化,可使Al4O4C之效果長時間持續。
本發明之鋁氧碳化物組成物其特徵為具有Al4O4C之結晶,在任意剖面觀察該鋁氧碳化物組成物時,Al4O4C之結 晶之剖面積換算成圓時之平均直徑為20μm以上。
鋁氧碳化物組成物中之Al4O4C之結晶由於為斜方晶系故大多情況下呈現柱狀或角柱狀之組織。以顯微鏡觀察時,以任一剖面觀察形狀均不同,但本發明之Al4O4C之結晶在觀察柱狀組織時,於短邊方向為10~2000μm左右。
且,本說明書中所謂「Al4O4C之結晶剖面積換算成圓時之平均直徑」,係在鋁氧碳化物組成物之顯微鏡觀察中,自剖面積大的Al4O4C之結晶依序累計剖面積直至超過其全體之一半之面積,且將所累計之各別結晶之剖面積換算成圓時之各別直徑之平均值。Al4O4C結晶之剖面積及將剖面積換算成圓時之直徑可使用影像處理軟體算出。
如此具有平均直徑為20μm以上之Al4O4C之結晶之鋁氧碳化物組成物可藉由使碳質原料與氧化鋁質原料在電弧爐中熔融後,例如在該電弧爐中冷卻,亦即緩冷而製造。
過去,研削材等藉由使鋁氧碳化物組成物電弧熔解而製造時,以電弧爐熔融後,壓鑄入電弧爐外之模具中成為錠塊。然而,以該製造方法,以電弧爐熔融後,為了壓鑄入電弧爐外之模具中,熔融後之冷卻速度成為超過10℃/mim之急冷,所得Al4O4C之結晶成為其平均直徑為小於10μm之微細者。
相對於此,以電弧爐熔融後,於該電弧爐內直接冷卻時,其冷卻速度成為10℃/min以下之緩冷,其緩冷過程中Al4O4C之結晶成長,平均直徑成為20μm以上。又,鋁氧碳化物組成物除Al4O4C以外具有剛玉結晶,且亦含有少量之 Al2OC或AlON等之氧氮化物、γ-Al2O3等。
如此若Al4O4C之結晶為平均直徑20μm以上,則使用中之Al4O4C之氧化受到抑制,且可使Al4O4C之效果長時間持續。進而,存在剛玉之結晶時,剛玉可成為障壁而抑制Al4O4C之氧化,且可使Al4O4C之效果長時間持續。Al4O4C之結晶之平均直徑上限並無特別限制,但作為耐火物之骨材原料之使用粒度在一般粗粒區域中為3mm左右,故較好為3mm以下。
本發明之鋁氧碳化物組成物較好具有上述之Al4O4C之結晶與剛玉之結晶交互層合排列之層狀組織。如前述,Al4O4C在850℃以上之氧化環境下已知會氧化成為氧化鋁。氧化成為氧化鋁時,無法獲得Al4O4C原本特徵之抗氧化效果、耐腐蝕性改善效果、低熱膨脹效果。在使剛玉之結晶層合為層狀之組織,剛玉層有保護Al4O4C之結晶氧化之效果,抑制鋁氧碳化物組成物整體氧化之效果較高,可長時間保持Al4O4C之該等特徵。
本發明之鋁氧碳化物組成物較好是碳含量為3.2~6.3質量%以下。該碳含量成為鋁氧碳化物組成物中之Al4O4C之含量之指標。亦即,理論上之Al4O4C之碳含量為6.52質量%,鋁氧碳化物組成物之碳含量為6.52質量%時,鋁氧碳化物組成物中之Al4O4C之含量成為100質量%。鋁氧碳化物組成物之碳含量未達3.2質量%時Al4O4C較少,會有無法充分獲得Al4O4C之效果。另一方面,碳含量超過6.3質量%時,容易產生容易水和之碳化鋁,不僅缺乏組織安定性,且剛 玉之結晶減少,或者不含,故Al4O4C之氧化抑制效果減小,在氧化環境下難以長時間保持Al4O4C。
本發明之鋁氧碳化物組成物係如上述,以電弧爐使碳質原料與氧化鋁質原料熔融後,例如在該電弧爐內冷卻(緩冷)而製造。
至於此時使用之碳質原料,可使用一般使用之碳質原料作為耐火物原料。可使用例如瀝青、石墨、焦炭、碳黑、及粉末有機樹脂等。其中石墨可使用鱗狀石墨、土壤石墨、膨脹石墨、及人造石墨。碳質原料之C含有率為90質量%以上,更好為95質量%以上。
又,氧化鋁質原料可使用一般使用之氧化鋁質原料作為耐火物之原料。例如,可使用以拜耳法(Bayer process)等將天然礬土(bauxite)等純化而人工作成之Al2O3純度為95質量%以上之電熔氧化鋁、燒結氧化鋁、及鍛燒氧化鋁等。另外,礬土頁岩(China Bauxite)、礬土、黏土、及煉瓦屑等亦可在氧化鋁質原料整體之Al2O3純度較好為90質量%以上,更好為95質量%以上之範圍下使用。
又,本發明中亦可使用氧化鋁碳質或氧化鋁石墨質之耐火物等、含有碳與氧化鋁之耐火物作為碳質原料或氧化鋁質原料。該情況下,碳質原料及氧化鋁質原料整體中所佔之碳與氧化鋁之合計含量較好調整成90質量%以上,更好為95質量%以上,進而碳質原料及氧化鋁質原料之整體中,碳與氧化鋁之比率以莫耳比(C/Al2O3),較好調整 成0.8~2.0之範圍。
Al4O4C由於以下述(1)之反應生成,故理想上碳質原料與氧化鋁質原料之莫耳比宜為1.5。
2Al2O3+3C=Al4O4C+2CO………(1)
藉由調整碳質原料之含量,可某種程度地控制鋁氧碳化物組成物中之碳含量(Al4O4C含量),但在通常之熔融條件下,雖原因並不明確,但碳被氧化生成較多之剛玉(Al2O3)。進而產生局部生成Al4C3等之問題。
此認為是因電弧爐形式、電壓條件等造成之熔融環境之影響所致者。考慮實用上大量生產時,有必要使用大型電弧爐,另外,有必要以高電壓、高電力進行熔融。該情況下,熔融環境成為氧化環境,故認為難以生成Al4O4C,使剛玉(Al2O3)之生成變多。
因此,本發明係在碳質原料與氧化鋁質原料中加比例計為0.2~10.0質量%之碳化矽、碳化硼、氮化鋁、氮化硼及金屬之一種以上。以電弧爐熔融亦較佳。
機制之細節並不清楚,但如此藉由添加金屬等之抗氧化劑,以熔融時及冷卻時之環境所致之碳質原料之氧化受到抑制,使碳質原料有效率地與氧化鋁質原料反應熔融。Al4O4C之熔點為1850℃以上之高溫區域,但藉由氧化鋁與碳之反應生成Al4O4C認為係在產生液相之1850℃以下且被認為可進行燒結反應之1000℃以上之適當溫度下所引起。因此,本發明中添加之金屬在1000℃以上之溫度區域中之氧親和力必須比碳還強。
又,本發明中添加之金屬係與由氧化鋁與碳之反應而生成一氧化碳進行例如下述(2)之反應,藉此使作為一氧化碳而消失之碳固定化,認為亦可達到增加碳收率之效果。
添加矽作為金屬時,產生下述(2)之反應。
2CO+Si=SiO2+2C………(2)
本發明中使用之金屬係以金屬粉或金屬塊被使用,藉由熔融或冷卻時(製造時)之環境抑制碳質原料或Al4O4C之氧化。因此,在碳開始氧化之500℃以上,較好為認為係生成Al4O4C之1000℃以上之溫度區域中,使用氧親和力比碳強之金屬。具體而言,可使用例如Si、Mn、Al、Ca、Mg、Zr、Ti等中之一種以上。又,亦可使用含該等金屬之合金。金屬、合金之純度並無特別限制,但宜為90%以上者。
本發明之其他樣態係添加碳化矽、碳化硼、氮化鋁及氮化硼中之一種以上代替金屬或與其併用。
其機制並不明確,但推測碳化矽(SiC)、碳化硼(B4C)、氮化鋁(AlN)及氮化硼(BN),與金屬同樣,利用環境抑制熔融時及冷卻時之碳質原料之氧化,有效地達到碳質原料與氧化鋁反應熔融之效果。再者,例如SiC之情況下,認為碳有效地熔出於熔融原料中,係有助於Al4O4C之生成者。
本發明中使用之碳化矽、碳化硼、氮化鋁及氮化硼,在耐火物之技術領域中,可使用一般作為碳之抗氧化劑等 使用者。其純度並無特別限制,但宜為90%以上者。
本發明中,上述之碳質原料、氧化鋁質原料、金屬、碳化矽等原料較好以使C成分之偏差在±10%以內之方式均勻混合。藉由如此事前均勻混合原料,可提高Al4O4C之收率,且可抑制Al4C3之生成。
此處所謂的「均勻混合」意指取樣原料之混合物時偏差極少之狀態。本發明中其指標係以C成分之偏差表示。此處所謂「C成分之偏差」意指自混合原料而成之混合物取樣3次,分析取樣之混合物之C成分,相對於C成分之目標設定值差異最大的分析值與目標設定值之差相對於目標設定值之比例(%)。該C成分之偏差較好在±10%以內,更好在±5%以內。又,為了均勻混合,較好使用一般市售之粉末用混練機混合。又,所謂目標設定值(%)為原料之混合物所占含碳原料之比例(%)×含碳原料之C成分含有率(%)。含碳原料之C成分含有率為混合前之測定值。
至於電弧爐可使用使氧化鎂或氧化鋁等耐火物熔融並製造時通常使用者。電弧爐可視需要添加金屬等使碳質原料與氧化鋁質原料之混合物熔融。具體而言係在1850~2400℃左右熔融。熔融後,在該電弧爐內冷卻,且藉由粉碎所得錠塊獲得鋁氧碳化物組成物。
又,本發明中藉由將碳質原料中之碳與氧化鋁質原料中之氧化鋁之莫耳比(C/Al2O3)控制在0.8~2.0之範圍,可控制Al4O4C之含有率。
本發明之鋁氧碳化物組成物可適用作為耐火物之原料,尤其做為骨材(粒徑0.2mm以上)。又,使用本發明之鋁氧碳化物組成物作為耐火物之原料時,其含量較好為15~95質量%。鋁氧碳化物組成物之含量未達15質量%時會有無法充分獲得鋁氧碳化物組成物之效果。另一方面,含量超過95質量%時,以減低彈性率為目的而添加之碳、或作為抗氧化或燒結材添加之金屬或碳化物、氮化物、硼化物等之抗氧化劑、以及作為黏結劑添加之酚樹脂等之添加量受到限制,難以獲得作為耐火物充分之強度、彈性率、耐氧化性等之特性。
[實施例]
藉由以電弧爐使原料熔融後,在該電弧爐內冷卻(緩冷)之本發明之製造方法,與作為比較例之藉由以電弧爐使原料熔融後,壓鑄入電弧爐外之模具中急速冷卻之以往製造方法,分別製造鋁氧碳化物組成物,且評價其特性。其結果示於表1。
以表1所示之比例,以合計成為500kg之方式秤量鍛燒氧化鋁(Al2O3成分99.9質量%)與鱗狀石墨(C成分99質量%)。且,實施例1~6、8、9及比較例2中相對於鍛燒氧化鋁及鱗狀石墨之合計100質量%,以外加比例計添加Al、Si或SiC。
且,實施例1~5、8、9及比較例2中,在調配上述原料後,以V錐型混合機混合5分鐘。實施例6、7及比較例1未進行均勻混合之處理。原料混合物之C成分之偏差以上述方法評價。
將該等原料之混合物加入1000KVA之電弧爐中熔融後,於實施例中係直接緩慢冷卻,比較例中係壓鑄入電弧爐外之模具中,分別製造鋁氧碳化物組成物之錠塊。實施例中之冷卻速度為0.7℃/分鐘左右,比較例中之冷卻速度 為15℃/分鐘左右。
使所製造之鋁氧碳化物組成物之錠塊粉碎、整粒後,依據JIS-R2205測定表觀比重及表觀氣孔率。又,針對化學成分係依據JIS-R2011測定C含量。又,C含量為JIS-R2205中所記載之自由碳、及碳化矽中碳之合計的總碳量。亦即,Al4O4C由於在820℃以上之溫度開始氧化,故自於900℃測定之碳與於1350℃測定之碳化矽中之碳量合計評價碳含量。理論上之Al4O4C之C含量為6.52質量%。
針對礦物相係以X射線繞射法之內部標準定量化。
微組織係以顯微鏡觀察,Al4O4C之結晶之平均直徑係如上述,表示在鋁氧碳化物組成物之顯微鏡觀察中,自剖面積之大的Al4O4C之結晶依序累計剖面積直至超過其一半之面積,且累積之各結晶之剖面積換算成圓時之各直徑之平均值。
熱膨脹率係自錠塊直接切出8×8×12mm之角柱樣品,利用熱機械分析(TMA),在大氣環境下進行測定至1000℃為止。又,為評價鋁氧碳化物組成物氧化後之熱膨脹率之維持率,而在1500℃於大氣環境下氧化處理8×8×12mm之角柱樣品3小時後,以同樣之熱機械分析(TMA),在大氣環境下進行測定至1000℃。
耐氧化性由於在Al4O4C氧化時變化成氧化鋁(剛玉),藉由計算出顯示Al4O4C之減少率(剛玉之增加率)之氧化鋁化率而進行評價。此處,氧化鋁化率係由下式表示。
具體而言,自錠塊切出10×10×10mm之樣品,在大氣環境下,於1500℃之溫度條件,使用旋轉爐氧化3小時後,測定碳含量,且與氧化試驗前預先測定之碳含量比較,算出氧化鋁化率。鋁氧碳化物組成物主要為剛玉與Al4O4C,其他成分極微量。因此,若測定碳含量,即可算出Al4O4C之含量。因此,藉由測定氧化試驗前後之碳含量,求得氧化試驗前後之Al4O4C之含量,算出氧化鋁化率。
由表1可知,Al4O4C之平均直徑為20μm以上之實施例之耐氧化性均優異。另一方面,比較例之Al4O4C之結晶平均直徑未達10μm者之耐氧化性差。
又,在大氣環境下、1500℃氧化之鋁氧碳化物組成物之熱膨脹率,在實施例1~9中所示之Al4O4C之結晶之平均直徑為20μm以上者均維持低的熱膨脹率,但比較例1及2所示之Al4O4C之結晶之平均直徑未達10μm者,熱膨脹率變高。
另外,由實施例2與實施例6之比較,可知藉由預先均勻混合原料,提高了Al4O4C之收率(含有率)。但,由實施例2與比較例2之比較,可知僅預先均勻混合原料對於耐氧化性之提高亦無效果。
另外,由實施例6、8、9與實施例7之比較,可知藉由添加金屬等抗氧化劑,提高了Al4O4C之收率(含有率)。
圖1顯示實施例2之微組織,圖2顯示比較例1之微組織。實施例2中,可知短徑50~250μm左右之柱狀Al4O4C之結晶,與短徑30~300μm左右之柱狀之剛玉結晶,或剛玉及Al4O4C之共晶區域交互排列成層狀同時成長。另一方面,比較例1中,Al4O4C之結晶與剛玉之結晶微細化至未達10μm。
接著,使用表1之實施例2、比較例1及2之鋁氧碳化物組成物,分別製造含碳之耐火物,且評價其特性。其結果示於表2。
以表2所示之比例調配各種原料,將作為黏結劑之酚樹脂以外加添加5質量%,經混合、成形後,藉由在300℃之溫度加熱而製造含碳之耐火物。
針對所製造之含碳耐火物評價Al4O4C含量、體積比重、虛表孔率、熱膨脹率、耐腐蝕性、耐氧化性、耐液相氧化性、及耐熱衝擊性。
體積比重及虛表孔率係以JIS-R2205中所記載之方法進行評價。熱膨脹率係以JIS-R2207-1中所記載之非接觸 法,在氮氣環境下進行評價至1000℃。
耐腐蝕性係使用高頻感應爐,使SS材與氧化鐵粉熔融製作CaO/Al2O3=2.2之合成熔渣,在該合成熔渣中進行1600℃×3小時之試驗,測定熔損量。接著以後述表3之比較例5之熔損量作為100而指數化。數值愈小則耐腐蝕性愈好。
耐液相氧化性係使用高頻感應爐使SS材熔融,在其熔鋼中進行1600℃×5小時之試驗,測定鋼浴部之氧化層厚度。接著以後述表3之比較例5之氧化層厚度作為100而指數化。數值愈小則耐液相氧化性愈好。
耐熱衝擊性係重複使試料浸漬於1600℃之熔鋼中3分鐘後經空氣冷卻之循環,由直至剝落之次數判斷良好與否。具體而言,以N=2之試料以直到剝落之平均次數進行評價。數值愈大則耐熱衝擊性愈好。
由表2可知,使用表1之實施例2之鋁氧碳化物組成物之實施例10,相較於使用表1之比較例1及2之鋁氧碳化物組成物之比較例3及4,其耐腐蝕性、耐液相氧化性、耐熱衝擊性均優異。實施例10即使在高溫之試驗條件下,Al4O4C仍不會氧化,由於長時間保持,故認為為Al4O4C之特徵的由改善與熔渣潤濕性所致之耐腐蝕性良好。且,液相氧化試驗中亦同樣,由於保持Al4O4C故認為提高了高溫區域中之耐氧化性。耐液相氧化性之效果就運轉方面而言,認為係Al4O4C與FeO反應形成緻密之Al2O3層而獲得高的氧化抑制效果所致者。再者,即使耐熱衝擊試驗中在重 複高溫熱處理之條件下由於亦保持Al4O4C,故認為低熱膨脹率效果所致之耐剝落(spalling)性優異。相對於此,比較例3及4中,鋁氧碳化物組成物在高溫之試驗條件下短時間即氧化,由於Al2O3化故而認為與熔渣潤濕性降低而使耐腐蝕性下降,且,耐氧化性亦降低,進而使伴隨高熱膨脹率之耐剝落性降低者。
接著,使用表1之實施例5之鋁氧碳化物組成物製造含碳耐火物,且評價其特性。其結果示於表3。又,表3之比較例5為未使用鋁氧碳化物組成物之含碳耐火物。
以表3所示之比例調配各種原料,以與表2之例相同之方法製造含碳耐火物。且,所製造之含碳耐火物之特性亦以與表2之例相同之方法評價。
任一實施例與比較例5相較,耐腐蝕性、耐液相氧化性、耐熱衝擊性均優異。
圖1為本發明之鋁氧碳化物組成物(表1之實施例2)之微組織照片。
圖2為以往之鋁氧碳化物組成物(表1之比較例1)之微組織照片。

Claims (9)

  1. 一種鋁氧碳化物組成物,其係具有Al4O4C之結晶之鋁氧碳化物組成物,其特徵為在任意剖面觀察該鋁氧碳化物組成物時,Al4O4C之結晶之剖面積換算成圓時之平均直徑為20μm以上。
  2. 如申請專利範圍第1項之鋁氧碳化物組成物,其係進而含有剛玉(corundum)結晶。
  3. 如申請專利範圍第2項之鋁氧碳化物組成物,其中Al4O4C之結晶與剛玉之結晶交互排列成層狀。
  4. 如申請專利範圍第1~3項中任一項之鋁氧碳化物組成物,其中含碳量為3.2~6.3質量%以下。
  5. 一種鋁氧碳化物組成物之製造方法,其係如申請專利範圍第1~4項中任一項之鋁氧碳化物組成物之製造方法,其特徵為於電弧爐中使碳質原料與氧化鋁質原料熔融後,在該電弧爐內冷卻。
  6. 如申請專利範圍第5項之鋁氧碳化物組成物之製造方法,其中於前述碳質原料與前述氧化鋁質原料中,添加以外加比例計為0.2~10.0質量%之選自碳化矽、碳化硼、氮化鋁、氮化硼及金屬之一種以上,且在電弧爐中熔融後,於該電弧爐內冷卻。
  7. 如申請專利範圍第5或6項之鋁氧碳化物組成物之製造方法,其係將原料均勻混合成C成分之偏差成為±10%以內。
  8. 一種耐火物,其含有如申請專利範圍第1~4項中任 一項之鋁氧碳化物組成物作為骨材。
  9. 一種耐火物,其含有15~95質量%之如申請專利範圍第1~4項中任一項之鋁氧碳化物組成物。
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