Dense in situ TiB2/TiN and TiB2/TiC ceramic matrix composites: reactive synthesis and properties

Готман, И.; Travitzky, Nahum; Gutmanas, E.Y.

doi:10.1016/s0921-5093(97)00835-6

Cited by 95 publications

(50 citation statements)

References 18 publications

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“…It was noted that this system is hard to ignite; therefore, it was necessary to use special high-temperature igniting compositions for stable initiation of SHS [9]. This fact agrees with the results of [3], where it was found that heating of samples with this composition even to a temperature of 1370 K does not initiate a self-propagating reaction.…”

Section: Introductionsupporting

confidence: 77%

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Combustion of mechanically activated 3Ti + 2BN mixtures

Корчагин

Bokhonov

2010

Combust Explos Shock Waves

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Laws of self-propagating high-temperature synthesis in 3Ti + 2BN reactive mixtures after preliminary mechanical activation in a planetary ball mill are studied. A discontinuity caused by specific features of the dynamics of formation of mechanocomposites is observed on the plots of the burning rate and temperature versus time. Regimes of preliminary activation are determined, which ensure the solid-phase combustion regime. Results of x-ray diffraction phase analysis and electron microscopy of combustion products and initial mixtures for different times of mechanical activation are presented.

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Section: Introductionsupporting

confidence: 77%

“…Spark plasma sintering (SPS) of mechanically activated 2Ti + B + BN mixtures were used. Gotman et al [3] and Shapiro et al [4] used a specially developed facility for this purpose, which allowed a thermal explosion at high pressures and reactive hot pressing (RHP).…”

Section: Introductionmentioning

confidence: 99%

Combustion of mechanically activated 3Ti + 2BN mixtures

Корчагин

Bokhonov

2010

Combust Explos Shock Waves

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“…Further, the ignition time increased and the SHS reaction became difficult to ignite. Figure 3(b) shows the phase constituents of the SHS products from the 40 wt pct Ni-Ti-B 4 [B 4 C] 150lm , respectively). As can be seen, when the B 4 C size is £45 lm, the reaction tends to be complete, leaving a small amount of Ni 20 Ti 3 B 6 .…”

Section: B Reaction Behaviors and Productsmentioning

confidence: 99%

“…[16] The increase of B 4 C particle size leads to the decrease of the combustion temperature and dwell time, and therefore the TiC and TiB 2 particle sizes turn out to be smaller. Figure 2(c) shows the variation of the combustion temperature (T c ) of the Ni-Ti-B 4 3.5lm ). Compared with the B 4 C particle size, the Ti particle size plays a much less significant role.…”

Section: B Reaction Behaviors and Productsmentioning

confidence: 99%

“…[2,3] Generally, TiC and TiB 2 can be produced from Ti-B-C, Ti-B 4 C, and Ti-B 4 C-C with proper proportions of the reactants during SHS. [2][3][4][5][6][7][8][9][10][11][12] It is well known that the formation of liquid and its subsequent capillary spreading are essential to the ignition and the propagation of the combustion wave, because it substantially increases the contact surface area among reactants and provides an easier route for reactant mass transfer. However, the reactions in these systems are somewhat difficult to initiate due to high melting temperatures of the reactants (Ti).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Reactant Particle Size on the Self-Propagating High-Temperature Synthesis Reaction Behaviors in the Ni-Ti-B4C System

Yang

Wang

Zhao

et al. 2008

Metall Mater Trans A

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The effect of the reactant particle size on the self-propagating high-temperature synthesis (SHS) reaction behaviors in the Ni-Ti-B 4 C system was investigated in the present study. The B 4 C particle size has a significant effect on the ignition behavior and combustion wave velocity, while Ti and Ni particle sizes have only a limited influence. Increasing the B 4 C particle size retards the reaction initiation and remarkably lowers the combustion velocity and combustion temperature. The reaction products are mainly dependent on the B 4 C particle size. Nevertheless, decreasing Ni and Ti particle sizes is in favor of perfect products consisting of only TiC, TiB 2 , and Ni phases.

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Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Готман

Gutmanas

2018

Adv Eng Mater

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Over the last decades, there has been a decisive shift from basic science to applied research that brought about the development of a number of unconventional combustion processes that allow for simultaneous synthesis and consolidation of otherwise difficult-to-process high temperature materials. External pressure application during thermal explosion (TE) mode of self-propagating high-temperature synthesis (SHS) can produce dense products provided the combination temperature and pressure are sufficient for consolidation. In the developed TE-based reactive forging (RF) method, a self-sustained reaction is ignited by rapid heat transfer from press die and rams, and a moderate consolidation pressure is applied when the combustion product still contains a sufficient amount of liquid or very soft phase. Plastic flow of the product results in filling the shape of the die thus producing a near-net-shape part. Reactive forging (RF) is especially efficient in combination with the developed short distance infiltration (SDI) approach based on the presence of a low melting phase component (e.g., Al, Mg, Ti-Ni eutectics) in the non-dense reactant blend that is squeezed into the pores under the applied pressure thereby increasing the interparticle contact area and enhancing exothermic heat release rate. Compared to traditional reactive melt infiltration, SDI has the advantage of the considerably shorter infiltration distances (μm vs. mm-cm). Close temperature monitoring during RF and RF/SDI processing provides a deeper insight into the SHS reaction mechanisms. The "heat sink" action of the pressure die after TE results in rapid cooling of the consolidated products and correspondingly fine microstructures and high mechanical properties. Examples of successful application of the RF/SDI processing of homogeneous and functionally graded in situ composites based on binary (Al 2 O 3 , TiB 2 , TiC, TiN) and ternary (MgAl 2 O 4 , Ti 3 SiC 2 , Ti 3 AlC 2 ) ceramics, as well as intermetallic-ceramic and metal-ceramic interpenetrating phase composites are described. Nanostructuring of reactant blends results in lower SHS ignition temperatures, and thus can be utilized for two-stage ignition of multi-component composite materials and structures with tunable ignition delay. Pressure assisted SHS is a "green," cost-effective, and thus perspective manufacturing route of nearnet-shape structural parts. Examples of successful application of RF and RF-SDI approach to fabrication of ceramic matrix-diamond grinding wheels, light armor tiles and high melting temperature nozzles are presented.

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Dense in situ TiB2/TiN and TiB2/TiC ceramic matrix composites: reactive synthesis and properties

Cited by 95 publications

References 18 publications

Combustion of mechanically activated 3Ti + 2BN mixtures

Combustion of mechanically activated 3Ti + 2BN mixtures

Effect of Reactant Particle Size on the Self-Propagating High-Temperature Synthesis Reaction Behaviors in the Ni-Ti-B4C System

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

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