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Ceramic envelope for high intensity discharge lamp and method for producing a polycrystalline transparent sintered alumina body
Ceramic envelope for high intensity discharge lamp and method for producing a polycrystalline transparent sintered alumina body
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机译:高强度放电灯用陶瓷外壳和制备多晶透明烧结氧化铝体的方法
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摘要
The invention provides a method for producing a polycrystalline transparent sintered alumina body suitable for use in a ceramic envelope for a high intensity discharge lamp, with optimized kinds and amounts of sintering aids. First, adding and mixing, to alumina of a purity of 99.9 % or higher, MgO within a range from 0.002 to 0.010 wt.% and La2O3 within a range from 0.005 to 0.020 wt.%, in such a manner that a sum of MgO and La2O3 is 0.030 wt.% or less and that a ratio thereof satisfies a relation 0.2≤MgO/La2O3≤0.5. Next, firing a mixture at 900 to 1200°C and cast molding the fired alumina. Then, after a chelating treatment, sintering the molded alumina for at least 1 hour at 1650 to 1900°C in a reducing atmosphere under a normal pressure.
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机译:本发明提供了一种具有优化的烧结助剂的种类和数量的,适用于高强度放电灯用陶瓷外壳的多晶透明烧结氧化铝体的制造方法。首先,以使MgO的总和的方式向纯度在99.9%以上的氧化铝中添加0.002〜0.010wt%的MgO和0.005〜0.020wt%的La 2 O 3并进行混合。 La 2 O 3为0.030重量%以下,且其比率满足0.2≤MgO/ La 2 O 3≤0.5的关系。接下来,在900至1200℃下烧制混合物,并将烧制的氧化铝浇铸成型。然后,在螯合处理之后,在还原性气氛中于常压下在1650至1900℃下将成型的氧化铝烧结至少1小时。
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