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PRODUCTION OF TiB 2 -B 4 C COMPOSITE POWDERS BY THE CARBIDE BORONIZING PROCESS ABSTRACTIt is clear that converting the minerals to advanced technology products has a great importance, when Turkey has the 80% of whole boron reserves of world. When viewed from this aspect, investigating production conditions of borides which are synthesised by using metal oxides and boron oxides produced from domestic resourses is the main problem. Titaniumdiboride (TiB 2 ) is a boride has an importance for applications comprising wear and high temperature. B 4 C is one of the advanced technology ceramics of present day since it has high melting point, hardness, wear resistance, chemical stability and low density. And it is also keeps its rigidity even at elevated temperatures such as 13000 o C. In this study, it is aimed to fabricate TiB 2 -B 4 C and ZrB 2 -B 4 C composite powders which have high melting point, hardness and excellent chemical stability. Therefore, it is planned that gaining TiB 2 -B 4 C composite powder by chemical reaction with boronising the TiC and amorphous boron powder which is easily provided instead of the adding difficultly provided TiB 2 in B 4 C powder.
30MnB5steels has a wide usage range such as in automotive industry for design of vehicles, which has low height and high securıty, used at high temperatures and for agricultural equipments used at low temperatures. The aim of this study is determine both the mechanical properties and transition temperature. Once the 30MnB5 steel was air quenched and then tempered. The microstructure analysis and hardness measurements was realized. Also, charpy test was performed at temperature range from (-80 o C) to (+40 o C) for establishing the transition temperature of the material.
Wear losses have a great importance in the world machinery industry. They cause billions of dollars in financial losses every year. Studies on surface treatments are increasing day by day in order to minimize the wear losses of materials. In this study, the pack boronizing process was applied to AISI 4140 and AISI H13 steels, which are frequently used in the manufacturing and molding industry, by using Ekabor II powder at 900 °C and 950 °C for 4 and 6 hours. Microstructural examinations of the samples subjected to metallographic processes were carried out. Afterwards, microhardness measurements were performed by applying 50 gf load for 10 seconds. Wear tests were carried out using pin-on-disk tribotests in a dry environment under 2 N and 5 N loads on the CSM Tribometer device. Wear losses were measured as volumetric loss. Thanks to the boronizing process, surface quality, surface hardness, and wear resistance of both steel materials were increased at a high rate.
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