A refractory object can include at least 10 wt% Al2O3. In an embodiment, the refractory object can further include a dopant including an oxide of a rare earth element, Ta, Nb, Hf, or any combination thereof. In another embodiment, the refractory object may have a property such that the averaged grain size does not increase more than 500% during sintering, an aspect ratio less than approximately 4.0, a creep rate less than approximately 1.0x10-5 µm/(µm x hr), or any combination thereof. In a particular embodiment, the refractory object can be in the form of a refractory block or a glass overflow forming block. The glass overflow forming block can be useful in forming an Al-Si-Mg glass sheet. In a particular embodiment, a layer including Mg-Al oxide can initially form along exposed surfaces of the glass overflow forming block when forming the Al-Si-Mg glass sheet.
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机译：耐火物体可包括至少10wt％Al 2 O 3 。在一个实施方案中，耐火物质还可包括掺杂剂，包括稀土元素，Ta，Nb，Hf或其任何组合的氧化物。在另一个实施例中，耐火物体可以具有使得平均晶粒尺寸在烧结期间不会增加500％，纵横比小于约4.0，蠕变率小于约1.0×10 -5 μm/（μmx hr），或其任何组合。在特定实施例中，耐火物体可以是耐火块或玻璃溢流形成块的形式。玻璃溢流形成块可用于形成Al-Si-Mg玻璃板。在一个特定实施方案中，包括Mg-Al氧化物的层沿着在形成Al-Si-Mg玻璃板时沿玻璃溢流形成块的暴露表面初始形成。
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