Titanium Boride Powders Research Articles

High-Temperature Stability of Titanium Boride Reinforced Alumina-Silicon Carbide Based Composite

Alumina and Silicon Carbide based composites are routinely used in mechanical, automobile, ceramic and aerospace industries with numerous reinforcements. Reinforcements increase the physical, chemical, mechanical, thermal and tribological properties and make Al2O3-SiC suitable for a specific application. In this research, Titanium Boride powder of average size 95 nm reinforced into Al2O3-SiC nano-composite to enhance the thermal stability. The Al2O3-SiC nano-composite with 5, 10, 15 and 20 vol.% TiB2 were fabricated through pressureless sintering under an argon atmosphere at 1600 °C. The high-temperature thermal stability of Al2O3-SiC-TiB2 nano-composite was analyzed through the thermo-gravimetric analyzer (TG/DTA) with a warming rate of 10 °C/min and compared with Al2O3-SiC. A strong endothermic peak recorded at 1288 °C and excellent thermal stability recorded up to 1488 °C. 20% Titanium Boride added Alumina-Silicon Carbide nano-composite exhibited 6% reduced mass change and 20% increase in thermal stability at 1488 °C. The microstructure of the Al2O3-SiC-20 vol.% TiB2 was studied using XRD and SEM equipped with an EDX analysis facility. The SEM image displayed the surface morphology of the composite and XRD, EDX analysis exhibited the presence of Titanium particles with an average size of 95 nm.

Carbon nanotube growth on titanium boride powder by chemical vapor deposition: Influence of nickel catalyst and carbon precursor supply

Chemical vapor deposition was employed for the growth of carbon nanotubes (CNTs) on titanium boride (TiB2), with nickel (Ni) as the catalyst and methane (CH4) as the carbon precursor. The effects of the Ni catalyst and the CH4 supply on the growth of CNTs were evaluated. The crystallinity and microstructure of the CNTs were characterized by XRD, SEM, EDS, TEM, and Raman spectroscopy. Analysis showed that the dispersion and morphology of the carbon products depended on the distribution of the Ni catalyst, and the quantity and length of the grown CNTs were affected by the CH4 gas flow rate. The CNTs grown on the TiB2 substrate with a small amount of impurities and high productivity were well distributed under the following conditions: Ni concentration, 10 wt%; CH4 gas flow rate, 100 mL min−1; growth temperature, 850 °C; and duration, 150 min.

Laser cladded Ti + TiB2 on Steel Rail Microstructural Effect

Rail transportation has been one of the most efficient and sustainable means of mobility with large economic value. The rail wheel flange steers on the rail track for motion with imparts of frictional force and rotational speed. High temperature is generated and prolific wear at high speed which is reduced by lubrication. Additive manufacturing techniques of laser cladding of steel rail surface were employed in this study with the ceramics of Titanium and Titanium boride powders at different mix ratio on steel rail surface. Different metallurgical characterization of cladded surface was carried out. The best hardness and microstructural view were noticed at 50:50 mix ratio of the cladded ceramics. The phase transformation of the varying mix ratio was also revealed.

The effect of TiB2 content on the properties of AA6005/TiB2 nanocomposites fabricated by mechanical alloying method

An A6005 aluminium alloy composite reinforced with different contents of titanium boride particles (2.5, 5 and 10 wt%) was produced by a mechanical alloying (MA) route. First, the aluminium alloy and titanium boride powders were blended by MA at different milling times, from 1 to 10 h. The samples obtained after MA processing were microstructurally and mechanically characterised by OM, SEM, TEM, LDS, XRD and micro-hardness tests. The optimum size distribution and suitable mechanical properties were obtained with 5 or 10 wt% of titanium boride particles after 8 h of MA, when the steady state is reached. Hot extrusion was employed as a consolidation process. An extruded sample of powders with a 5 wt% reinforcement content that was MA for 8 h was characterised by TEM, FE-SEM and nanoindentation tests. The results show a good distribution of the nano-reinforcement within the aluminium matrix. Nano-indentation test shows an increment in hardness values from 2.6 GPa for the reference extrusion of A6005 powders without MA and reinforcement to 3.3 GPa for the A6005 extrusion with 5 wt% TiB2 and MA for 8 h.

Structural transformations during heat treatment of W-Mo cast high-speed steel modified using titanium diboride

The effect of the austenitizing temperature on the transformation of the primary structure of a tungsten-molybdenum high-speed steel of the R6M5 type modified by an addition of a titanium boride powder has been studied. The results of metallographic, X-ray diffraction, and electron-microprobe analysis of the steel have been discussed. It is shown that an increase in the austenitizing temperature from 1180 to 1260°C causes significant structural transformations both in the carbide constituent and in the steel matrix.

次世代磁性材料へのアプローチ 界面化学的手法を用いた機能性粉体の調製

Most of chemical reactions proceed at the interface between two different phases except some gas and liquid phase reactions. The precise control of the interfaces thus allows us to tune the microstructure and properties of materials obtained. In this report, preparation methods of nano-functional powders utilizing interfacial reactions are described. First, a novel preparation method of titanium boride powders by tuning solid/solid interface is described. Preparations of silica nanoporous materials and polystyrene latex particles utilizing nano-tuned liquid/liquid interfaces are also described.

Electrochemical synthesis of titanium diboride in the dispersed state from halide melts

A study is made of the electrolytic deposition of titanium boride powders from halide melts. The conditions required for the deposition of different phases are determined. On the whole, the synthesis process is controlled by interrelated factors: electrolyte composition, current density, and the temperature and duration of the electrolysis operation.

Sintering of highly dispersed titanium diboride and composite titanium diboride-calcium hexaboride powders

The sintering behavior in vacuum of ultrafine nonmilled titanium boride powder and a composite of the latter with CaB6 was investigated. It was shown that such titanium boride powders and TiB2−CaB6 composites poses better sinterability than conventional powders; the temperature of rapid densification was approximately 200°C lower. The introduction of ∼1% each of Fe and Ni into the TiB2−5% CaB6 composite noticeably accelerated densification due to the formation of a transient liquid phase. The effect was further enhanced by the activation of surface and volume diffusion by the solution of Fe and Ni in TiB2, as well as recrystallization processes.

Production of titanium boride powders from waste materials: I.V. Sokol et al, Poroshkovaya Metallurgiya, No 8, 1993, 1–7. (In Russian)

Production of titanium boride powders from waste materials: I.V. Sokol et al, Poroshkovaya Metallurgiya, No 8, 1993, 1–7. (In Russian)

Conditions of production of high-porosity graphite-containing sintered titanium diboride materials

The feasibility is demonstrated of producing, by the powder metallurgy method, a porous TiB2 material containing graphite microspheres acting as a pore-forming agent. A sintered material composition was determined giving the best combination of porosity and strength, and optimum conditions of production of such a material were established. A study was made of the sintering densification kinetics of a material of optimum composition. It was found that its sintering densification is linked with the behavior of its titanium boride powder matrix, since the volume of the graphite microspheres remains virtually unchanged during heating. It is shown that Ivensen's equation can be employed for describing curves of densification experienced by the composite material investigated during heating.