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Ceramic Armour
Published in Paul J. Hazell, Armour, 2023
Titanium diboride (TiB2) is a relatively dense ceramic (4500 kg/m3) that is normally hot-pressed mainly because it is difficult to sinter. TiB2 is a very high-performing ceramic but is relatively expensive—some three to four times that of hot-pressed silicon carbide. This material is electrically conductive, which has the benefit of being able to be machined using electro-discharge methods, which is very handy because it is notoriously difficult to grind in its hot-pressed form.
Continuous Random Variables
Published in William M. Mendenhall, Terry L. Sincich, Statistics for Engineering and the Sciences, 2016
William M. Mendenhall, Terry L. Sincich
Fracture toughness of materials. Titanium diboride is an extremely hard ceramic material known for its resistance to mechanical erosion or fracture. The fracture toughness of the material, measured in megaPascals per meters-squared (MPa/m2), was modeled using the Weibull distribution in Quality Engineering (Vol. 25, 2013). One possible set of Weibull parameters for this data is α = 6 and β = 1800.
Elastomer-Based Compositematerials Comprising Carbide And Boride Ceramics
Published in Nikolay Dishovsky, Mihail Mihaylov, Elastomer-Based Composite Materials, 2018
Nikolay Dishovsky, Mihail Mihaylov
Titanium diboride is known for its high conductivity at low temperatures. When TiB2 (a conductive filler) is used to reinforce the composites, their conductivity acquires a semiconductive course.22 Wako Chemical Company Tokyo, Japan also provided TiB2 the particle size of which varied about 2-4 pm.
Effect of the addition of TiB2 with waste glass powder on microstructure, mechanical and physical behavior of PET-based polymer composite material
Published in Mechanics of Advanced Materials and Structures, 2023
Shashi Prakash Dwivedi, Shubham Sharma, B. Vijay Krishna, Pankaj Sonia, Kuldeep Kumar Saxena, Amjad Iqbal, Faramarz Djavanroodi
Titanium diboride (TiB2) particles were chosen as the primary reinforcement material (Figure 1(a)). Titanium diboride (TiB2) particles are a type of ceramic material that is well-known for their high melting point, excellent hardness, and tough wear resistance. They are often used in a range of industrial applications, including aerospace, automotive, and cutting tools. TiB2 particles have a hexagonal crystal structure and are typically produced through a number of different methods, including hot-pressing, spark plasma sintering, and chemical vapor deposition. The particle size distribution of TiB2 particles can vary greatly depending on the production method used.One of the main advantages of TiB2 particles is their high melting point, which makes them ideal for use in high-temperature environments. This property, coupled with their high hardness and wear resistance, also makes them suitable for abrasive applications such as cutting tools, grinding wheels, and bearings.In addition, TiB2 particles are known to exhibit excellent electrical conductivity, high thermal conductivity, and low coefficient of thermal expansion. These properties make them suitable for use as a thermal spray coating for various parts, such as engine components and turbine blades.TiB2 particles are a highly versatile material that offers excellent mechanical properties and is widely used in a range of industrial applications. Powder XRD of TiB2 particlesshows 99% purity (Figure 2(a)).
Influences of B4C content and particle size on the mechanical properties of hot pressed TiB2–B4C composites
Published in Journal of Asian Ceramic Societies, 2021
Jun Zhao, Qinggui Li, Weixiao Cao, Zetan Liu, Xiangong Deng, Xiang Ding, Songlin Ran
Titanium diboride (TiB2) is a high temperature resistant ceramic material, with exceptional hardness, high melting point, good chemical stability, excellent electrical and thermal conductivity [1–4]. These properties make TiB2 be applied in many industries, such as wear resistant devices, protective materials, ultra-high temperature refractory. However, due to its low self-diffusion coefficient, monolithic TiB2 ceramic exhibits a poor sintering property. The sintering temperature of monolithic TiB2 ceramics is usually above 2000°C. High temperature sintering causes grain coarsening of TiB2 and residual porosity, resulting in a low relative density. Therefore, monolithic TiB2 ceramics show unsatisfied mechanical properties and poor oxidation resistance.
Wear and Friction Behavior of TiB2 Thin Film–Coated AISI 52100 Steels under the Lubricated Condition
Published in Tribology Transactions, 2020
Doğuş Özkan, Mustafa A. Yılmaz, Seda Ataş Bakdemir, Egemen Sulukan
Titanium diboride (TiB2) is the most prominent member of hard binary and transition metal diboride ceramics family with a hexagonal crystal structure (1–4). Due to high hardness and elastic modulus of 30 and 450 GPa, respectively, TiB2 has high wear resistance in tribological systems (5–7). TiB2 coatings have been deposited by several conventional physical vapor deposition (PVD) techniques. The desired mechanical and microstructure properties of TiB2 coatings can be obtained via DC magnetron sputtering PVD. The microstructure (growth and orientation) of TiB2 coatings can be controlled during the deposition period by applying bias, rotation, and heating to the substrates (8–10). However, it is hard to provide good adhesion of the TiB2 coating to the substrate in the presence of residual stress. Berger et al. (11) reported that residual stresses in the production of TiB2 coatings can be significantly reduced by switching the polarity of the substrate bias from negative to positive on the growing film surface. They also reported that positively biased coatings have a higher hardness and Young’s modulus when compared to negatively biased TiB2 coatings (11). In addition, Zhang et al. (12) focused on superhard TiB2 coatings synthesized from the TiB2 compound target by a high-power impulse magnetron sputtering technique at different temperatures and bias voltages. Contrary to Berger et al.’s study, they reported that TiB2 coating shows the best mechanical and nano wear properties at −200 V bias voltage and 300 °C coating temperature (12). On the other hand, to date, TiB2 coatings have been mostly investigated for antiwear tool steel coatings and were only tested under unlubricated conditions. (13). In this study, AISI 52100 steel substrates were coated with TiB2 thin films via magnetron sputtering PVD under different RF powers and stable high positive bias voltage. The effects of different RF powers on the microstructure and mechanical properties of thin-film TiB2 coatings under high positive bias voltage were investigated with friction and wear behaviors under boundary lubrication. The main goal of this study is the determination of thin-film TiB2 as an alternative coating for internal combustion engine (ICE) cam tappets, which has not yet been reported in the literature. Friction coefficients and wear rates of the coatings were evaluated with tribometer tests and coating–lubricating oil interactions were also examined with tribochemical analysis. Results showed that the change in RF power with a high bias voltage has important effects not only on the coating microstructure and mechanical properties but also on the friction and antiwear properties of the TiB2 coating.