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The influence of the sintering conditions on the properties of the stainless steel reinforced with TiB2 ceramics

Sulima I., Klimczyk P., Hyjek P.

Archives of Materials Science and Engineering

2009

Vol. 39, nr 2

103-106

Purpose: The paper analyzes the influence of the temperature and pressure on the properties and structure of the austenitic AISI 316L stainless steel reinforced with 1% vol.TiB2 ceramics. Design/methodology/approach: The sintered austenitic AISI 316L stainless steel reinforced with 1% vol.TiB2 were obtained using the high temperature-high pressure (HT-HP) method at pressure of 5.0 and 7.5 š 0.2 GPa and temperatures 900°C, 1150°C and 1300°C. The duration of sintering was 60 seconds. Young's modulus measurements were carried out using ultrasonic method. Mechanical properties were determined by Vickers hardness test. For microstructure observation scanning electron microscope JEOL JSM-6460LV was used. Findings: The decrease of the hardness of the sintered austenitic AISI 316L stainless steel with the increasing temperature of sintering was observed. However, the Young's modulus increases with the growth of the temperature of sintering. The results showed that the hardness increased with increasing pressure. The microstructural investigations indicated that the TiB2 ceramics were distributed along grain boundaries. Practical implications: The obtained results show that the temperature and pressure have influence on the mechanical and physical properties of the investigated steel reinforced with 1% vol.TiB2. These results may be used to design new materials i.e. austenitic stainless steel reinforced with TiB2 ceramics. Originality/value: The results from this work can be useful in determining conditions for sintering the austenitic AISI 316L stainless steel reinforced with various volume fractions of TiB2 ceramics.

Sintering of TiB2 ceramics

Sulima I., Figiel P., Suśniak M., Świątek M.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 11

687-690

Purpose: Titanium diborides (TiB2) ceramic is particularly interesting because it exhibits high elastic modulus and hardness as well as high thermal conductivity. The interest in TiB2 ceramic increased enormously due to these properties but applications seem to be limited due to difficulties during densification process. In the experiment the TiB2 compacts was obtained using HP-HT method. The aim of this study is to work out and optimize the sintering densification process of TiB2 ceramics. Design/methodology/approach: The high temperature-high pressure (HT-HP) Bridgman type apparatus was used for densification method of TiB2 powder. Ceramics were sintered at pressure of 7.2 ± 0.2 GPa and temperature at 1500-2300*C ± 50*C. The duration of sintering was 60 seconds. In order to investigate the structure changes, the optical and scanning electron microscope was used. Mechanical properties were determined by Vickers hardness. Young modulus measurements were carried out using ultrasonic method. Findings: The TiB2 ceramics was obtained without using sintering agents. The properties and structure of TiB2 ceramics strongly depend on conditions of sintering process. The application of the temperature of 1500*C ± 50*C and pressure of 7.2 ± 0.2 GPa and time of 60 seconds permits to obtain the TiB2 ceramics without cracks. Practical implications: The TiB2 ceramic might be used for production of composites. From a practical position it is important to optimize the sintering densification of TiB2 ceramic. Originality/value: The TiB2 ceramics were formed using HP-HT technique without the use of additives. This method of sintering for TiB2 ceramics is original one.