Effects of Dispersing Agent and MgO Content on Microstructure of DDC-Al<sub>2</sub>O<sub>3</sub> Ceramics

Hu Zeyi; Ding Yanhong; Yin Ruiming; Li Li; Fan Caihe; Hu Weida; Chen Xihong

doi:10.15980/j.tzzz.2017.03.020

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Effects of Dispersing Agent and MgO Content on Microstructure of DDC-Al₂O₃ Ceramics
Vol. 37, Issue 3, Pages: 306-308(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.03.020

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[1]胡泽艺,丁燕鸿,银锐明,李礼,范才河,胡伟达,陈喜红.分散剂及MgO添加量对DDC-Al_2O_3陶瓷显微组织的影响[J].特种铸造及有色合金,2017,37(03):306-308.

Hu Zeyi, Ding Yanhong, Yin Ruiming, et al. Effects of Dispersing Agent and MgO Content on Microstructure of DDC-Al₂O₃ Ceramics. [J]. Special Casting & Nonferrous Alloys 37(3):306-308(2017)
[1]胡泽艺,丁燕鸿,银锐明,李礼,范才河,胡伟达,陈喜红.分散剂及MgO添加量对DDC-Al_2O_3陶瓷显微组织的影响[J].特种铸造及有色合金,2017,37(03):306-308. DOI： 10.15980/j.tzzz.2017.03.020.

Hu Zeyi, Ding Yanhong, Yin Ruiming, et al. Effects of Dispersing Agent and MgO Content on Microstructure of DDC-Al₂O₃ Ceramics. [J]. Special Casting & Nonferrous Alloys 37(3):306-308(2017) DOI： 10.15980/j.tzzz.2017.03.020.

摘要

采用直接凝固注模成型法（direct coagulation casting

DCC）中Mg

体系

制备高致密度、高强度的Al2O3陶瓷坯体

对比分析了不同分散剂及MgO添加量对Al

陶瓷物理及力学性能的影响。结果表明

固相含量为55%的Al

陶瓷生坯强度为207kPa

此时生坯具有足够的脱模强度;当分散剂浓度为1.2%时

浆料粘度达到最小值

为65mPa·s

低粘度浆料有利于真空搅拌除气

且非常适合于注模操作。当MgO添加量为0.3%时

生坯最短凝固时间为170min

且生坯烧结后密度达到3.93g/cm

其密度为理论密度的99%。

Abstract

The high intensity and high strength Al

ceramic green body was prepared by direct coagulation casting（DCC）in Mg

system.Effects of different addition of MgO and dispersants on physical and mechanical properties of Al

ceramics were analyzed.The results reveal that the Al

with 55%solid content has release strength of 207 kPa.The viscosity of Al

slurry reaches the lowest of 65mPa·s

and low viscosity slurry is conducive to vacuum agitation degassing and it is suitable for injection molding operation with dispersant concentration of 1.2%.In addition

the solidification time is 170 min when the MgO addition is 0.3%.Meanwhile the density after sintering reaches up to 3.93g/cm

which is 99%of theoretical density.