Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Annular boron carbide-aluminum oxide pellet as well as near-net-size forming preparation method and application thereof
The invention provides an annular boron carbide-aluminum oxide pellet and a near-net-size forming preparation method and application thereof.The annular boron carbide-aluminum oxide pellet is prepared by the steps that B4C, Al2O3 and a sintering aid are mixed to be uniform through wet ball milling, then a surface modifier is added for further ball milling to form prepared slurry, the prepared slurry is subjected to spray granulation to form spherical composite powder, and the spherical composite powder is prepared into the annular boron carbide-aluminum oxide pellet. Performing dry isostatic pressing on the spherical composite powder to form a thin-walled tube green body; gradient heating sintering and surface finish machining are conducted on the thin-walled tube green body, and finally the annular boron carbide-aluminum oxide pellet is obtained; due to the addition of the surface modifier, the uniformity of the prepared slurry and the flowability of spherical composite powder formed by spray granulation can be improved; during high-temperature sintering, it is ensured that a surface modifier is completely removed by setting a reasonable heat preservation point, in the sintering densification process, medium-temperature section (1200 DEG C) heat preservation is preferably conducted in a micro-positive-pressure argon atmosphere, then the temperature is increased to 1400-1600 DEG C for sintering, and changes of deformation, density and inner diameter shrinkage of the pellet are accurately controlled.
本发明提供一种环状碳化硼‑氧化铝芯块及近净尺寸成型制备方法和应用，采用湿法球磨先行将B4C、Al2O3、烧结助剂混合均匀，再添加表面改性剂进行进一步球磨，形成调制浆料，调制浆料经喷雾造粒，形成球形复合粉体，球形复合粉体经干式等静压压制，形成薄壁管生坯；对薄壁管生坯进行梯度升温烧结和表面精加工，最终得到环状碳化硼‑氧化铝芯块；表面改性剂的添加有利于提高调制浆料的均匀性以及喷雾造粒形成的球形复合粉体的流动性；高温烧结时，通过设置合理的保温点，确保表面改性剂完全脱除，并在烧结致密化过程中，优选在微正压的氩气氛围中进行中温段(1200℃)保温，再升温至1400～1600℃进行烧结，精准控制芯块的变形量、密度、内径收缩率的变化。
Annular boron carbide-aluminum oxide pellet as well as near-net-size forming preparation method and application thereof
The invention provides an annular boron carbide-aluminum oxide pellet and a near-net-size forming preparation method and application thereof.The annular boron carbide-aluminum oxide pellet is prepared by the steps that B4C, Al2O3 and a sintering aid are mixed to be uniform through wet ball milling, then a surface modifier is added for further ball milling to form prepared slurry, the prepared slurry is subjected to spray granulation to form spherical composite powder, and the spherical composite powder is prepared into the annular boron carbide-aluminum oxide pellet. Performing dry isostatic pressing on the spherical composite powder to form a thin-walled tube green body; gradient heating sintering and surface finish machining are conducted on the thin-walled tube green body, and finally the annular boron carbide-aluminum oxide pellet is obtained; due to the addition of the surface modifier, the uniformity of the prepared slurry and the flowability of spherical composite powder formed by spray granulation can be improved; during high-temperature sintering, it is ensured that a surface modifier is completely removed by setting a reasonable heat preservation point, in the sintering densification process, medium-temperature section (1200 DEG C) heat preservation is preferably conducted in a micro-positive-pressure argon atmosphere, then the temperature is increased to 1400-1600 DEG C for sintering, and changes of deformation, density and inner diameter shrinkage of the pellet are accurately controlled.
本发明提供一种环状碳化硼‑氧化铝芯块及近净尺寸成型制备方法和应用，采用湿法球磨先行将B4C、Al2O3、烧结助剂混合均匀，再添加表面改性剂进行进一步球磨，形成调制浆料，调制浆料经喷雾造粒，形成球形复合粉体，球形复合粉体经干式等静压压制，形成薄壁管生坯；对薄壁管生坯进行梯度升温烧结和表面精加工，最终得到环状碳化硼‑氧化铝芯块；表面改性剂的添加有利于提高调制浆料的均匀性以及喷雾造粒形成的球形复合粉体的流动性；高温烧结时，通过设置合理的保温点，确保表面改性剂完全脱除，并在烧结致密化过程中，优选在微正压的氩气氛围中进行中温段(1200℃)保温，再升温至1400～1600℃进行烧结，精准控制芯块的变形量、密度、内径收缩率的变化。
Annular boron carbide-aluminum oxide pellet as well as near-net-size forming preparation method and application thereof
一种环状碳化硼-氧化铝芯块及近净尺寸成型制备方法和应用
BAI XUE (Autor:in) / SUN YUE (Autor:in) / WANG XINGMING (Autor:in) / LIU YUYANG (Autor:in) / ZHANG XINNAN (Autor:in) / ZHANG HENG (Autor:in) / YANG LEI (Autor:in) / ZHANG ZHICHAO (Autor:in)
11.10.2024
Patent
Elektronische Ressource
Chinesisch
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