Investigations of selected mechanical, wear properties and transparency of alumina obtained by combined PIM and SPS techniques

Estarki, Mohammad Reza Loghman; Vellashani, Faezeh Abedi; Moinifard, Farzad; Milani, Mostafa; Kumar, Anjan; Ghazi, Mohammad Reza; Sardarian, Mehran; Estarki, Mohammad Reza Loghman; Vellashani, Faezeh Abedi; Moinifard, Farzad; Milani, Mostafa; Kumar, Anjan; Ghazi, Mohammad Reza; Sardarian, Mehran

doi:2022.59.6.909

J. Korean Ceram. Soc. > Volume 59(6); 2022 > Article

Original Article

Journal of the Korean Ceramic Society 2022;59(6): 909-919.
doi: https://doi.org/10.1007/s43207-022-00233-w

Investigations of selected mechanical, wear properties and transparency of alumina obtained by combined PIM and SPS techniques

Mohammad Reza Loghman Estarki¹

, Faezeh Abedi Vellashani¹, Farzad Moinifard², Mostafa Milani^1,3, Anjan Kumar⁴, Mohammad Reza Ghazi⁵, Mehran Sardarian⁶

¹Department of Materials Engineering, Malek Ashtar University of Technology, Isfahan, Iran
²Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
³Department of Advanced Materials and Renewable Energies, Iranian Research Organization for Science and Technology, 33131-93685, Tehran, Iran
⁴CAD LAB, GLA University, Mathura, India
⁵Department of orthodontics, Faculty of dentistry, Khorasgan Branch, Islamic Azad University, Khorasgan, Iran
⁶EBAD Company, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

Correspondence

Mohammad Reza Loghman Estarki ,Email: loghman57@gmail.com; mrlestarki@mut-es.ac.ir

Received: March 13, 2022; Revised: May 13, 2022 Accepted: May 31, 2022. Published online: August 2, 2022.

ABSTRACT

To produce transparent alumina pieces, alpha-alumina nanoparticles with different amounts of MgO sintering aid were dispersed in a paraffin-polypropylene-based binder system. The alumina-binder feedstock was optimized for the powder injection molding (PIM) method. After binder removal, the green body piece was sintered through the spark plasma sintering method. Rheometric tests, Vickers measurement, three-point bending flexural test, and Archimedes test were used for the feed fluidity, hardness, flexural strength, and density of the sintered pieces, respectively. Next, IR and visible transmission of SPSed bodies were measured. The results showed that a combination of PIM and SPS methods with 500 ppm sintering aid causes higher IR and visible transmission than the sample with 600 ppm sintering aid. In addition, the hardness of asobtained transparent alumina was in the range of 16–16.5 GPa. The flexural strength of the as-obtained transparent sample (with 500 ppm MgO) was more than SPSed with 600 ppm MgO sintering aid.

Key words: Alumina · Transparent · Rheology · Binder