Modeling of thermal explosion in constrained dies for B4C–Ti and BN–Ti powder blends

Shapiro, M.; Готман, И.; Dudko, V.

doi:10.1016/s0955-2219(99)00105-3

Cited by 9 publications

(7 citation statements)

References 13 publications

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“…Due to extremely high melting point, excellent corrosion resistance, low theoretical density, and excellent creep resistance boron based compounds such as TiB 2 or B 4 C, are ideal candidates for advanced ultra-high temperature devices [1,2,3,4,5,6]. Several applications have already been considered and reported including ultra-high temperature high wear-resistance devices.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to covalent bonds and small diffusion coefficients, which are advantageous for their applications [1], both TiB 2 and B 4 C are considered as materials which create a challenge for sintering [2,7,12]. Neither B 4 C nor TiB 2 can be obtained as a monophasic full density material, despite many methods that have been applied, such as pressure-less sintering at 2423 K [12,29], HP (Hot Pressing) [8,14,18,20,30], SPS (Spark Plasma Sintering), reaction sintering [7,14,30] etc.…”

Section: Introductionmentioning

confidence: 99%

“…Self-propagating high temperature synthesis (SHS), also known as combustion synthesis, is inexpensive, straightforward and an attractive method convenient for synthesis of advanced materials, such as high-refractory non-oxide ceramics [2,18,31,33] or multiphase materials [13], from elemental powders. Exploiting the self-sustaining character of a highly exothermic reaction once initiated, allows reduction of the cost of sintering, which is significant for highly refractory materials [34].…”

Section: Introductionmentioning

confidence: 99%

“…However, by conducting the synthesis simultaneously under high pressure, the composites can be fabricated in a one stage process. It has been demonstrated that the application of pressure during or subsequent to the combustion step can significantly increase the product density [2], especially for synthesis with additives [28,39]. …”

Section: Introductionmentioning

confidence: 99%

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TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Ziemnicka-Sylwester

2013

Materials

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TiB2-based ceramic matrix composites (CMCs) were fabricated using elemental powders of Ti, B and C. The self-propagating high temperature synthesis (SHS) was carried out for the highly exothermic “in situ” reaction of TiB2 formation and the “tailing” synthesis of boron carbide characterized by weak exothermicity. Two series of samples were fabricated, one of them being prepared with additional milling of raw materials. The effects of TiB2 vol fraction as well as grain size of reactant were investigated. The results revealed that combustion was not successful for a TiB2:B4C molar ratio of 0.96, which corresponds to 40 vol% of TiB2 in the composite, however the SHS reaction was initiated and self-propagated for the intended TiB2:B4C molar ratio of 2.16 or above. Finally B13C2 was formed as the matrix phase in each composite. Significant importance of the grain size of the C precursor with regard to the reaction completeness, which affected the microstructure homogeneity and hardness of investigated composites, was proved in this study. The grain size of Ti powder did not influence the microstructure of TiB2 grains. The best properties (HV = 25.5 GPa, average grain size of 9 μm and homogenous microstructure), were obtained for material containing 80 vol% of TiB2, fabricated using a graphite precursor of 2 μm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Ziemnicka-Sylwester

2013

Materials

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“…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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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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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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Modeling of thermal explosion in constrained dies for B4C–Ti and BN–Ti powder blends

Cited by 9 publications

References 13 publications

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Combustion of mechanically activated 3Ti + 2BN mixtures

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

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