The Effect of Charge Component Composition on the Structure and Properties of Titanium Matrix Sintered Composites with High-Modulus Compounds

Synthesis of Ti/TiB Composites via Hydrogen-Assisted Blended Elemental Powder Metallurgy

“…These experiments cannot reduce the average residual porosity below 5%-6%. As expected, the use of HDH titanium powder sieved to less than 100 µm (i.e., with a particle size distribution similar to that of the TiH 2 powder presented in Figure 1) results in even worse densification, similar to that observed in Baglyuk et al (2017), and an increase in residual porosity to 9% for the Ti/8.4% TiB composite (Table 1, #6).…”

“…These spaces further impede direct contact between the reactants, diminishing the TiB formation rate and sometimes stopping the reaction during its intermediate stages. Two more reasons for the noted excess porosity are the gap between the diffusion capabilities of titanium and boron at elevated temperatures (Baglyuk et al, 2017) and the difference between the boron diffusion velocities in TiB and TiB 2 phases. These factors can cause the formation of Kirkendall porosity during boron redistribution (Panda et al, 2003).…”

“…To produce composites via the BEPM route, TiB 2 , boron, and boron carbide (B 4 C) (Gorsse and Miracle, 2003;Saito, 2004;Tamirisakandala et al, 2004;Tjong and Mai, 2008;Tamirisakandala et al, 2010;Kumar et al, 2012;Huang et al, 2015;Li et al, 2016;Baglyuk et al, 2017;_vasishin et al, 2017;Ivasishin et al, 2019) powders are used as starting materials. They are blended with either titanium or titanium hydride (Saito, 2004;Baglyuk et al, 2017;_vasishin et al, 2017;Ivasishin et al, 2019) powders to form monoboride TiB particles via a high-temperature reaction between titanium and the abovementioned powders (Tjong and Mai, 2008). However, solid-state reactive sintering of such blends with the in-situ formation of Titanium-titanium boride (Ti/TiB) composites generally leads to excessive porosity, which is detrimental to mechanical behavior.…”

“…Because of the temporary presence of hydrogen in titanium powder, residual pores can be reduced up to 1%-2% and the contents of interstitials, such as oxygen and chlorine, can be decreased to acceptable levels via dehydrogenation and sintering (Savvakin et al, 2012). However, unlike with titanium alloys, the titanium hydride approach is less effective in producing in-situ Ti/TiB and Ti-6Al-4V/TiB composites via the BEPM route (Baglyuk et al, 2017;_vasishin et al, 2017). Better densification of TiH 2 -based blends than Tibased blends has been observed only at low TiB-phase contents.…”

Crystalline potassium dihydrogen phosphate (KDP) powders

“…Of course, the main role in the properties of a nanomaterial is played by the type of system, which can be single-component [74][75] or multicomponent [76][77][78][79]. No less important is the technology of preparation [80][81][82][83][84][85] and processing of the material before its use, which confirms the theoretical [90][91][92] and experimental [93][94][95][96][97][98][99][100] data.…”