Preparation and microstructure of machinable Al2O3/mica composite by ball milling and hot-press sintering

Qingbo Tian, Deyu Kong, Tongguang Zhai

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A machinable α-Al2O3/mica composite was prepared by hot-press sintering. In this experiment, a mica-contained glass ceramic in the MgO-Al2O3-SiO2-F glassy system was employed and the base glass powders were obtained by traditional melting-quenched method. Then, α-Al2O3 milling swarf was introduced by medium α-alumina milling ball to the glass powders. The test results indicate that the composites consist of mica crystal and mullite crystal, which are precipitated in the base glass. The α-Al2O3 shows an irregular polygon, which is inlayed in the base material. With the decrease of size of the base glass powders, the boundaries of composites among the sintered powders gradually vanish. The mica crystals in the composite also show an interlocking characteristic, which is a prerequisite of mica-contained glass ceramics with good machinability. Under different pressures, the tendency of preferred orientation is decreased with the reduction in grain size of glass powders, and the microstructure is proved to be consistent, significantly decreasing the composite's hardness. Therefore, the machinability of the composite is improved.

Original languageEnglish
Pages (from-to)573-577
Number of pages5
JournalScience and Engineering of Composite Materials
Issue number5
StatePublished - Sep 1 2016

Bibliographical note

Publisher Copyright:
© 2016 Walter de Gruyter GmbH, Berlin/Boston.


  • alumia/mica composites
  • ball milling
  • glass ceramic
  • sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


Dive into the research topics of 'Preparation and microstructure of machinable Al2O3/mica composite by ball milling and hot-press sintering'. Together they form a unique fingerprint.

Cite this