Yasin Bozkurt Yılmaz, Ph.D Candidate
Metallurgical and Materials Engineering
Yıldız Technical University
www.linkedin.com/in/yasinbozkurtyilmaz/
Development of Boron Carbide - Calcium Hexaboride Ceramic Composites
Supervisor: Assoc Prof. Dr. Buğra Çiçek
Boron carbide (B4C) is the hardest material known after diamond and cubic boron nitride. It has many superior properties such as high temperature resistance, low density and chemical inertness. It is preferred in many fields in industry, from cutting tool inserts to ballistic protective plates. B4C shows its superior properties in forms with high density. However strong covalent bonds, which are the source of their superior properties, limit sinterability. Sinter additives are used to increase the sinterability of B4C. The high density of sinter additives eliminates the low density advantage of B4C. In addition, the mechanical properties of the sinter additives used differ from B4C, which affects the end product properties negatively. In this study, the use of calcium hexaboride (CaB6), whose mechanical and physical properties are similar to B4C, was investigated as a sinter additive. B4C-CaB6 mixtures containing 0%, 5%, 10%, 15%, 20% CaB6 were prepared. The prepared mixes were sintered under vacuum at 1900 °C and 30 MPa under Spark Plasma Sintering (SPS). Density-open porosity, hardness-toughness values of the samples obtained were measured. Phase transformations were analyzed by XRD method. Microstructures were analyzed by SEM-EDS.
[1] B. A. Galanov et al., “Penetration Resistance of B4C-CaB6 Based Light-weight Armor Materials,” Procedia Eng., vol. 58, pp. 328–337, 2013, doi: 10.1016/j.proeng.2013.05.037.
[2] Y. Qiao, L. Qu, X. Zhang, and H. Zhang, “Boron carbide composite ceramic preparation and corrosion behavior in simulated seawater,” Ceram. Int., vol. 41, no. 3, pp. 5026–5031, Apr. 2015, doi: 10.1016/j.ceramint.2014.12.070.
Publications
2020
Y. Yılmaz, U. Akkaşoğlu and B. Çiçek, "Low Temperature Densification of B4C Ceramics with CaB6 Additives", in The 7th International Scientific Research Congress – Science and Engineering, Ankara/Turkey, 2020.
Çöpoğlu, N., Yılmaz, Y.B., Cengiz, T., & Çiçek, B. (2020). Effects of Acid Resistance on Migration Behavior of Vitreous Enamels. Acta Materialia Turcica, 18-27.
Yılmaz, Y.B., Çöpoğlu, N., Cengiz, T., & Çiçek, B. (2020). Investigation of Nickel Effects on Matt Cast Iron Enamel. Acta Materialia Turcica, 10-17
2019
Çöpoğlu, N., Yılmaz, Y.B., Cengiz, T., & Çiçek, B. (2019). Optimizing the Migration Behavior of Vitreous Enamels. 9th International Advances in Applied Physics & Materials Science Congress & Exhibition (APMAS2019). Muğla.
Yılmaz, Y.B., Çöpoğlu, N., Cengiz, T., & Çiçek, B. (2019). Investigation of Nickel Effects on Matt Cast Iron Enamel. 9th International Advances in Applied Physics & Materials Science Congress & Exhibition (APMAS2019). Muğla.
Patent
New generation vitroceramic coating material with improved mechanical properties (Pat. Pending)
Frit composition containing animal waste developed for use in the structure of enamel coatings (Pat. Pending)
Frit composition containing poultry eggshells developed for use in enamel coatings (Pat. Pending)
Vitreous enamel coating material with improved mechanical properties (Pat. Pending)
Vitreous enamel coating material with improved aesthetic appearance (Pat. Pending)
Frit composition containing industrial waste developed for use in the structure of vitreous enamel coatings (Pat. Pending)
