Preparation by SHS-extrusion method of compact ceramic materials based on the Ti‒B system, modified with nanosized Si3N4 particles

2021 ◽  
pp. 132-135
Author(s):  
A. V. Bolotskaya ◽  
M. V. Mikheev ◽  
P. M. Bazhin ◽  
A. M. Stolin ◽  
Yu. V. Titova
Keyword(s):  
Phase Composition ◽  
Crack Resistance ◽  
Titanium Diboride ◽  
Mechanical Characteristics ◽  
Ceramic Materials ◽  
Shs Extrusion ◽  
Structure Phase ◽  
Initial Charge ◽  
Extrusion Method ◽  
Physical And Mechanical Characteristics

Compact ceramic materials based on the Ti‒B system modified with 5 wt. % of nanosized Si3N4 particles. The results of studies of the structure, phase composition, and physical and mechanical characteristics of the materials obtained are presented. It is shown that the addition of Si3N4 promotes the formation of new phases, in particular, titanium diboride and nitride in the final product. It was found that the introduction of modifying nanosized Si3N4 particles into the initial charge leads to an increase in hardness and microhardness by 15‒20 %, as well as to an increase in crack resistance by 1,5 times in comparison with unmodified samples.

scholarly journals Investigation of the structure, phase composition and physical-mechanical characteristics of high-strength laminated materials which contain corrosion-resistant steels with high nitrogen content

2018 ◽  
Vol 145 ◽  
pp. 05004
Author(s):  
Evgeniia Putilova ◽  
Eduard Gorkunov ◽  
Sergey Zadvorkin
Keyword(s):  
Phase Composition ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Nitrogen Content ◽  
Corrosion Resistant ◽  
Austenite Stability ◽  
Current State ◽  
Magnetic Methods ◽  
Structure Phase ◽  
Laminated Materials

In this work, we studied the structure, phase composition, mechanical and magnetic properties of structural steel clad with corrosion-resistant steels with varying degrees of austenite stability in order to determine the possibility of using magnetic methods for diagnostics the current state of such materials.

scholarly journals Methods to improve mechanical characteristics of ceramics on the basis of zirconium and hafnium diborides (Review)

2020 ◽  
Vol 10 (2) ◽  
pp. 180-190
Author(s):  
Ekaterina N. Portnova
Keyword(s):  
Crack Resistance ◽  
Mechanical Characteristics ◽  
Sintered Material ◽  
Ceramic Materials ◽  
Second Phase ◽  
Ceramic Samples ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Particles ◽  
Sintering Method

This paper describes the main methods for improving the mechanical properties of ceramic materials based on zirconium and hafnium diborides, such as strength and crack resistance. Particular attention is paid to the influence of the sintering method, as well as additives introduced into the powder composition, in particular hard fibers, second-phase powder particles and “whiskers”, on the mechanical characteristics of the ceramics. On the basis of the analysis of literature data, it is shown that the spark plasma sintering (SPS) method allows to obtain ceramic samples with increased mechanical characteristics due to their high density and low defects. The addition of silicon carbide filamentous crystals or fibers to the ceramics can increase the crack resistance of the sintered material up to 6.0–8.5 MPa×m1/2. These conclusions can be useful in the development of ultra-high-temperature ceramic materials.

scholarly journals Waterproofing material for protection of underground structures

2019 ◽  
Vol 97 ◽  
pp. 02008
Author(s):  
Olga Lyapidevskaya
Keyword(s):  
Crack Resistance ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Ethylene Vinyl Acetate ◽  
Hard Coatings ◽  
Optimal Composition ◽  
Underground Structures ◽  
High Elasticity ◽  
Main Disadvantage ◽  
Physical And Mechanical Characteristics

The article deals with the problem of increasing the durability of underground and buried buildings. One of the methods of solving this problem is ensuring the reliable protection of underground structures from the effects of water of different origin. Among the existing waterproofing coatings, mineral-based compositions are the most effective. However, the main disadvantage of such systems is the low crack resistance of hard coatings, which limits their applicability. We have made an attempt to develop a cement-based waterproofing material that would have high elasticity, strength, crack resistance and adhesion to a concrete base. We have conducted studies to justify the possibility of obtaining an effective waterproofing material by including microsilica and ethylene vinyl acetate in the mix. The optimal composition of the material was worked out. On the basis of the experimental data, the main physical and mechanical properties of the material were established. Based on the obtained results, it was found that the resulting material had high physical and mechanical characteristics and could be recommended for the protection of concrete structures used in underground construction.

Sintered material based on titanium carbide to increase the service life of slide gates

2021 ◽  
pp. 34-37
Author(s):  
M. S. Antipov ◽  
A. P. Chizhikov ◽  
A. S. Konstantinov ◽  
P. M. Bazhin
Keyword(s):  
Phase Composition ◽  
Titanium Carbide ◽  
Pressing Pressure ◽  
Optimal Parameters ◽  
Technological Parameters ◽  
Cermet Material ◽  
The Press ◽  
Crystal Lattice Parameters ◽  
Extrusion Method ◽  
Physical And Mechanical Characteristics

A new cermet material based on titanium carbide with a complex bond consisting of nichrome and nickel, additionally hardened with chromium carbide and a solid solution of chromium in titanium carbide, has been obtained. The influence of the technological parameters of the SHS-extrusion method (the delay time before the application of pressure, the pressing pressure, the speed of the press plunger movement) on the length of the extruded rod is studied, the optimal parameters are found. The microstructure and phase composition of the obtained material was investigated, the physical and mechanical characteristics were measured, and a comparison with analogs was given. It is shown that the microstructure, phase composition, and crystal lattice parameters of the phases do not change depending on the diameter of the extruded rod.

scholarly journals Regularities of the Effect of Process Parameters of SHS-Extrusion on the Structure and Properties of Long-Dimensional Rods from TiB / 30 wt. % Ti Materials

2020 ◽  
pp. 064-067
Author(s):  
A.S. Konstantinov ◽  
◽  
M.S. Antipov ◽  
P.M. Bazhin ◽  
A.M. Stolin ◽  
...  
Keyword(s):  
Process Parameters ◽  
Delay Time ◽  
Structural Features ◽  
Time Interval ◽  
Shs Extrusion ◽  
The Press ◽  
Optimal Values ◽  
Extrusion Method ◽  
Physical And Mechanical Characteristics

In this paper, the effect of the process parameters of the SHS-extrusion method (the delay time before applying pressure, the speed of movement of the press plunger) on the length and quality of extruded cylindrical rods with a diameter of 3 mm, obtained from TiB – 30 wt. % Ti materials, was studied. Their optimal values were determined: the delay time interval was 3–3.5 s, the press plunger speed interval was 40–50 mm/s. Using the results of SEM and XRD, the structural features of the obtained materials were studied, and their texture was determined. The physical and mechanical characteristics of the obtained materials were measured: porosity, hardness, microhardness.

Extraction of compact ceramic electrode materials based on the Ti‒B‒Fe system modified by nanosized AlN particles by SHS extrusion

2020 ◽  
pp. 51-55
Author(s):  
A. V. Bolotskaya ◽  
M. V. Mikheev
Keyword(s):  
Phase Composition ◽  
Aluminum Nitride ◽  
Electrode Materials ◽  
Combustion Characteristics ◽  
Nanosized Particles ◽  
Shs Extrusion ◽  
Effect Of Additives ◽  
Initial Charge

Compact ceramic electrode materials based on the Ti‒B‒Fe system modified with nanosized particles of aluminum nitride (up to 15 wt. %) were obtained by SHS extrusion. The effect of additives on the combustion characteristics of the studied system, as well as on the structure and phase composition of the obtained materials, is studied. The addition of aluminum nitride increases the content of boride and nitride phases in the final product. It was found that the introduction of modifying nanosized particles of aluminum nitride into the initial charge leads to the grinding of grains of boride and nitride phases, which together increases the microhardness by 10 %, in comparison with unmodified samples.

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