JP6549608B2 - マグネシウムに富むアルミン酸マグネシウムの溶融法粒子 - Google Patents
マグネシウムに富むアルミン酸マグネシウムの溶融法粒子 Download PDFInfo
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Description
・20.0%を超え50.0%未満のAl2O3、
・一緒にして当該粒子の重量の95.0%超に相当するAl2O3及びMgO、
という化学組成を示す溶融法粒子であって、CaO及びZrO2の累積含有量が4000重量ppm未満であることを特徴とする溶融法粒子に関する。
a)出発材料を混合して出発供給物を作る段階、
b)前記出発供給物を溶融液が得られるまで溶融させる段階、
c)前記溶融液を冷却し、それにより溶融液を、例えば3分未満で固体にする段階、
d)該固体の塊を粉砕し、溶融法粒子の混合物を得る段階、
を含む。
この比較例では、溶融法粒子を、以下の通常の出発材料から出発して溶融することにより調製する。
・酸化マグネシウム(MgO≧98.2重量%)粉末であって、以下の不純物組成(重量百分率)、すなわち、Al2O3:0.1%、CaO:0.8%、Fe2O3:0.4%、SiO2:0.2%、ZrO2:0.1%、MnO2:0.1%、を示すもの。
・酸化アルミニウム(Al2O3≧99%)粉末であって、以下の不純物組成(重量百分率)、すなわち、Na2O:0.23%、CaO<0.02%、MgO<0.05%、Fe2O3<0.02%、SiO2<0.05%、ZrO2<0.02%、TiO2<0.02%、を示すもの。
この例では、下記の通常の出発材料から出発して溶融により溶融法粒子を作製する。
・MgO≧99%、CaO≦0.1%、Na2O≦0.1%、SiO2≦0.05%、ZrO2≦0.02%、Fe2O3≦0.02%の化学分析値(重量%として)を示す酸化マグネシウム粉末。
・例1に使用したのと同一の酸化アルミニウム粉末。
得られた結果を下記の表1に示す。
・図1a及び1bは、比較例1による溶融法粒子のミクロ構造及び焼結セラミック成形品の材料のそれにそれぞれ相当しており、
・図2a及び2bは、本発明による例2の溶融法粒子のミクロ構造及び焼結セラミック成形品の材料のそれにそれぞれ相当している。
・マトリックス相1は均一でなく、そして2つの非常に相異なる領域7及び8から構成されていて、
・均一な領域7は約72%のAl2O3及び28%のMgOから構成され、したがって純粋な又は実質的に純粋なスピネルMgAl2O4相に相当しており、
・不均一な領域8は、平均して約58%のAl2O3及び42%のMgOから構成され、したがって上記の意味の範囲内でMgO−MgAl2O4共晶体に相当している。
・幅の広い混在物2(図中では暗いグレーで表示)は極めて本質的に、実際にはさらにもっぱら、MgOから構成されている。
・微細な混在物3(図中では白で表示)は極めて本質的に、実際にはさらにもっぱら、カルシウム及びジルコニウムの酸化物から構成されている。EPMA測定から、具体的に言えば、混在物は90%(重量基準)を超えるカルシウム及びジルコニウムの酸化物から構成されていることが示される。
本発明の代表的な態様としては、以下を挙げることができる:
《態様1》
スピネル構造のマグネシウムアルミニウム酸化物MgAl 2 O 4 及び/又はMgO−MgAl 2 O 4 共晶体のマトリックスから本質的に構成されている溶融法粒子であり、前記マトリックスが酸化マグネシウムから本質的構成されている混在物を含み、当該粒子は酸化物の形態で重量%として表して、下記の全体としての化学組成、すなわち、
・20.0%を超え50.0%未満のAl 2 O 3 、
・一緒にして当該粒子の重量の95.0%超に相当するAl 2 O 3 及びMgO、
という化学組成を示す溶融法粒子であって、CaO及びZrO 2 の累積含有量が4000重量ppm未満であることを特徴とする、溶融法粒子。
《態様2》
CaO及びZrO 2 の累積含有量が3000ppm未満である、態様1記載の溶融法粒子。
《態様3》
CaO及びZrO 2 の累積含有量が2500ppm未満である、態様1又は2記載の溶融法粒子。
《態様4》
アルミナAl 2 O 3 相を含まないことを特徴とする、態様1〜3のいずれか1つに記載の溶融法粒子。
《態様5》
不純物が本質的にCaO、ZrO 2 、Fe 2 O 3 、SiO 2 、Na 2 O及びMnO 2 である、態様1〜4の1つに記載の溶融法粒子。
《態様6》
2000ppm未満のCaOを含む、態様1〜5の1つに記載の溶融法粒子。
《態様7》
200ppm未満のZrO 2 を含む、態様1〜6の1つに記載の溶融法粒子。
《態様8》
Al 2 O 3 及びMgOが一緒になって当該粒子の重量の99.0%を超える、態様1〜7の1つに記載の溶融法粒子。
《態様9》
前記マトリックスがスピネル構造とMgO−MgAl 2 O 4 共晶体の別々の領域から構成されている、態様1〜8の1つに記載の溶融法粒子。
《態様10》
カルシウム酸化物及びジルコニウム酸化物から本質的に構成される微細混在物を含み、その最も大きな寸法が2マイクロメートル未満、好ましくは1マイクロメートル未満である、態様1〜9の1つに記載の溶融法粒子。
《態様11》
態様1〜10の1つに記載の溶融法粒子を焼結させることにより得られたセラミック材料。
《態様12》
カルシウム酸化物及びジルコニウム酸化物から本質的に構成される微細混在物を含み、その数が電子顕微鏡写真上で10000平方マイクロメートル当たりに100未満である、態様11記載のセラミック材料。
Claims (11)
- ・スピネル構造のMgAl2O4及びMgO−MgAl2O4共晶体のマトリックス、及び、
・前記マトリックス中の酸化マグネシウムの混在物、
を含む溶融法粒子であり、
当該粒子は、酸化物の形態で重量%として表して、下記の化学組成、すなわち、
・20.0%を超え50.0%未満のAl2O3、
・合計含有量が当該粒子の重量の95.0%超であるAl2O3及びMgO、
という化学組成を示し、
当該粒子中のCaO及びZrO2の累積含有量が、4000重量ppm未満であり、
前記マトリックスが、スピネル構造のMgAl 2 O 4 の領域とMgO−MgAl 2 O 4 共晶体の領域を含んでいる、
溶融法粒子。 - 前記粒子中のCaO及びZrO2の累積含有量が3000ppm未満である、請求項1記載の溶融法粒子。
- 前記粒子中のCaO及びZrO2の累積含有量が2500ppm未満である、請求項1又は2記載の溶融法粒子。
- アルミナAl2O3相を含まないことを特徴とする、請求項1〜3のいずれか1項記載の溶融法粒子。
- 不純物として、CaO、ZrO2、Fe2O3、SiO2、Na2O、TiO 2 又はMnO2 を含む、請求項1〜4のいずれか1項記載の溶融法粒子。
- 2000ppm未満のCaOを含む、請求項1〜5のいずれか1項記載の溶融法粒子。
- 200ppm未満のZrO2を含む、請求項1〜6のいずれか1項記載の溶融法粒子。
- Al2O3及びMgOの合計含有量が当該粒子の重量の99.0%を超える、請求項1〜7のいずれか1項記載の溶融法粒子。
- 前記マトリックス中に微細混在物を含み、前記微細混在物は、カルシウム酸化物及びジルコニウム酸化物を、前記カルシウム酸化物及び前記ジルコニウム酸化物の累積合計が当該微細混在物の80wt%超に相当するように含んでおり、前記微細混在物の最も大きな寸法が2マイクロメートル未満、好ましくは1マイクロメートル未満である、請求項1〜8のいずれか1項記載の溶融法粒子。
- 請求項1〜9のいずれか1項記載の溶融法粒子を焼結させることによる、セラミック材料を得るための方法。
- 前記セラミック材料が、そのマトリックス中に微細混在物を含み、前記微細混在物は、カルシウム酸化物及びジルコニウム酸化物を、前記カルシウム酸化物及び前記ジルコニウム酸化物の累積合計が当該微細混在物の80wt%超に相当するように含んでおり、前記微細混在物の数が、電子顕微鏡写真上で10000平方マイクロメートル当たりに100未満である、請求項10記載の方法。
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PCT/FR2015/050642 WO2015140459A1 (fr) | 2014-03-18 | 2015-03-17 | Grains fondus d'aluminate de magnésium riche en magnésium |
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US3993119A (en) | 1974-11-08 | 1976-11-23 | Norton Company | Progressively or continuously cycled mold for forming and discharging a fine crystalline material |
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US5344802A (en) * | 1993-11-15 | 1994-09-06 | Indresco Inc. | MgO-spinel refractory mix and shapes made therefrom |
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