High-frequency Induction Heated Combustion Synthesis Research Articles

Synthesis and properties of Ti-Al coating by high-frequency induction heated combustion

Ti-Al coatings with porosities of 1.11%− 2.28% were synthesized in situ via high-frequency induction heated combustion synthesis (HFIHCS) method within several minutes. The adiabatic temperatures at different preheating temperatures were calculated thermodynamically. The microstructure, phase composition, cross-sectional microhardness, oxidation, and corrosion resistance to molten aluminum alloy of the as-received coatings were investigated. The results showed that the Ti-Al reaction could be self-sustained when the preheating temperature reached 605 K. The combustion reaction and pore-forming mechanisms of the as-received Ti-Al coating conformed to liquid-solid reaction and thermal explosion, respectively. The coating microstructure followed a core-shell ring-shaped microstructure model, which was incomplete Ti nuclei, Ti3Al, TiAl and TiAl2 phases from inside to outside. The average microhardness of the substrate, interface and coating were 508.57, 454.54 and 377.18 HV0.2, respectively. The microhardness fluctuation was the largest at the coating-substrate interface. The oxidation kinetics of the as-received coating approximately followed a linear rate law with an oxidation rate constant of 0.3943 mg·cm−2·h−1 and a rate exponent of 1.2372. The oxide layer consisted of an outer layer of TiO2, an inner layer of nitrogen-containing compounds and a mixed layer of TiO2 and Al2O3 between them. The corrosion mechanism of the as-received Ti-Al IMC coatings in molten A380 alloy was mainly controlled by the combination of compounds formed at the liquid-solid interface and diffusion of liquid metal into the as-received Ti-Al coating, rather than by the dissolution mechanism of the as-received Ti-Al coating.

Simultaneous Synthesis and Consolidation of Nanostructured ZrB₂-ZrO₂ Composite.

A dense nanostructured 2ZrB₂-ZrO₂ composite was synthesized by the high-frequency inductionheated combustion synthesis (HFIHCS) method within 2 min in one step from mechanically activated powders of 2B₂O₃ and 3Zr. Simultaneous combustion synthesis and densification were accomplished under the combined effects of the induced current and mechanical pressure. A highly dense 2ZrB₂-ZrO₂ composite with relative density of up to 95.5% was produced under the simultaneous application of a pressure of 80 MPa and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Synthesis of Fe-Al<sub>2</sub>O<sub>3</sub> Composite by High-Frequency Induction-Heated Combustion

The Fe-Al2O3 composite has been prepared by high-frequency induction heated combustion synthesis (HFIHCS) from Fe2O3 and Al powders. The standard Gibbs energy minimization method was used to calculate the equilibrium compositions of the reacting species. The composition and microstructure of HFIHCS products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).

Simultaneous Synthesis and Densification of a Nanocrystalline (W,Ti)Si<SUB>2</SUB>-SiC Composite from Mechanically Activated Powders by High Frequency Induction Heating

(W,Ti)C and Si nanopowders were obtained using high-energy ball milling. A dense, nanostructured (W,Ti)Si2-SiC composite was synthesized by a one-step, high-frequency induction heated combustion synthesis method within 2 min from mechanically activated powders of (W,Ti)C and 3Si. Simultaneous combustion synthesis and consolidation were accomplished under the combined effects of an induced current and mechanical pressure. The average grain size and mechanical properties of the composite were investigated.

Simultaneous Synthesis and Densification of Nanostructured NbSi<sub>2</sub>-SiC-Si<sub>3</sub>N<sub>4</sub> by Rapid Sintering

A dense nanostructured 5NbSi2-SiC-Si3N4 composite was synthesized by the high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 minute in one step from mechanically activated powders of 4NbN, NbC and 14Si. A highly dense 5NbSi2-SiC-Si3N4 composite with relative density of up to 98% was produced under the simultaneous application of a pressure of 80 MPa and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Rapid synthesis and consolidation of nanostructured TaSi 2–SiC–Si 3N 4 composite from mechanically activated powders by high-frequency induction-heated combustion

A dense nanostructured 5TaSi 2–SiC–Si 3N 4 composite was synthesized by the high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 min in one step from mechanically activated powders of 4TaN, TaC and 14Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of the induced current and mechanical pressure. A highly dense 5TaSi 2–SiC–Si 3N 4 composite with relative density of up to 96% was produced under the simultaneous application of a pressure of 60 MPa and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Properties and synthesis of dense nanostructured VSi2-SiC by high-frequency induction heated combustion

A dense, nanostructured VSi2-SiC composite was synthesized by a high-frequency induction heated combustion synthesis (HFIHCS) method within 4 min in one step from powders of mechanically activated VC and 3Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of induced current and simultaneous application of 80 MPa, yielding highly dense VSi2-SiC. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Simultaneous synthesis and consolidation of nanostructured 1.5Ti-Al2O3 from mechanically activated powders by high-frequency induction heating

A dense nanostructured 1.5Ti-Al2O3 composite (volume fraction of Al2O3; 0.62) was simultaneously synthesized and consolidated in a high-frequency induction heated combustion synthesis method within 2 min in one step from mechanically activated powders of 1.5 TiO2 and 2 Al. Simultaneous combustion synthesis and consolidation were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense 1.5Ti-Al2O3 with a relative density of up to 99.8 % was produced under simultaneous application of 60 MPa of pressure and an induced current. The average hardness and fracture toughness values of the composite were 1513 kg/mm2 and 7 MPa·m1/2, respectively.

Consolidation of nanostructured ZrSi 2–Si 3N 4 synthesized from mechanically activated (4ZrN + 11Si) powders by high frequency induction heated combustion synthesis

Dense nanostructured 4ZrSi 2–Si 3N 4 composite was synthesized by high frequency induction heated combustion synthesis (HFIHCS) method within 1 min in one-step from mechanically activated powders of 4ZrN and 11Si. Simultaneous combustion synthesis and consolidation were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense 4ZrSi 2–Si 3N 4 with relative density of up to 98% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size and mechanical properties of the composite were investigated.

고주파유도가열 연소합성에 의한 나노구조 ReSi1.75제조 및 기계적 성질

Nanostructured <TEX>$ReSi_{1.75}$</TEX> was synthesized to have high density via rapid and cost effective process named as high-frequency induction heated combustion synthesis(HFIHCS) method. For the process, mechanically activated Re-Si powder was used, which had been prepared by mechanical ball milling of Re and Si powders with mixing ratio of 1:1.75. Both combustion synthesis and densification were accomplished simultaneously by applying electric current and mechanical pressure of 80 MPa during the process. The average grain size, hardness, and fracture toughness of the compound were 210 nm, 1085 <TEX>$kg/mm^2$</TEX> and 4 <TEX>$MPa{\cdot}m^{1/2}$</TEX>, respectively. The experimental results show that HFIHCS is a promising process for synthesis of nanostructured <TEX>$ReSi_{1.75}$</TEX> which has a potential for both high temperature and thermo-electric applications.

Simultaneous high-frequency induction heated combustion synthesis and consolidation of nanostructured HfSi2–SiC composite

Abstract Dense nanostructured HfSi 2 –SiC composite was synthesized by high-frequency induction heated combustion synthesis (HFIHCS) method in one step from powders of mechanically activated HfC and Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense HfSi 2 –SiC was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

High-Frequency Induction-Heated Combustion Synthesis and Consolidation of Nanostructured NbSi2from Mechanically Activated Powders

Dense nanostructured <TEX>$NbSi_2$</TEX> was synthesized by high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 minute in one step from mechanically activated Nb and Si powders. Highly dense <TEX>$NbSi_2$</TEX> with relative density of up to 99% was simultaneously synthesized and consolidated under the combined effects of an induced current and mechanical pressure of 60 MPa. The average grain size and mechanical properties (hardness and fracture toughness) of the compound were investigated.

Simultaneous synthesis and consolidation of nanostructured NbSi2–Si3N4 composite from mechanically activated powders by high-frequency induction-heated combustion

Abstract Dense nanostructured 4NbSi 2 –Si 3 N 4 composite was synthesized by high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 min in one step from mechanically activated powders of NbN and Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense 4NbSi 2 –Si 3 N 4 composite with relative density of up to 98% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

One Step Synthesis and Consolidation of Nanostructured ZrSi&lt;sub&gt;2&lt;/sub&gt;-SiC Composite and its Mechanical Properties

Dense nanostructured ZrSi2-SiC composite was synthesized by high frequency induction heated combustion synthesis (HFIHCS) method within 1 minute in one step from powders of ZrC and 3Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense ZrSi2-SiC with relative density of up to 98% were produced under simultaneous application of a 60MPa pressure and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Consolidation and mechanical properties of nanostructured 2MoSi 2–SiC composite synthesized by high-frequency induction heated combustion

Dense nanostructured 2MoSi 2–SiC composite was synthesized by high-frequency induction heated combustion synthesis (HFIHCS) method within 1 min in one step from powders of Mo 2C and 5Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense 2MoSi 2–SiC with relative density of up to 96.5% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size of MoSi 2 and SiC were about 50 and 40 nm, respectively. The hardness and fracture toughness values obtained were 1540 kg/mm 2 and 4.6 MPa m 1/2, respectively.

Fabrication of Nanocrystalline TaSi&lt;sub&gt;2&lt;/sub&gt;-SiC Composite by High Frequency Induction Heated Combustion Synthesis and Its Mechanical Properties.

By the high frequency induction heated combustion synthesis (HFIHCS) method, dense nanostructured TaSi2-SiC composite was synthesized within 2 minutes and in a single step from powders of TaC and 3Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense TaSi2-SiC with relative density of up to 97% were produced under a 60MPa pressure and induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

Consolidation of nanostructured NbSi2–SiC composite synthesized by high-frequency induction heated combustion

Abstract Dense nanostructured NbSi 2 –SiC composite was synthesized by high-frequency induction heated combustion synthesis (HFIHCS) method within 2 min in one step from powders of NbC and 3Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense NbSi 2 –SiC with relative density of up to 99.8% were produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

고주파유도가열 연소합성에 의한 치밀한 WSi2-20vol.%SiC 복합재료 제조 및 기계적 특성

Dense <TEX>$WSi_2$</TEX>-20vol.%SiC composite was synthesized by high-frequency induction-heated combustion synthesis(HFIHCS) method within 2 minutes in one step from elemental powder mixture of W, Si and C. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense <TEX>$WSi_2$</TEX>-20vol.%SiC with relative density of up to 97% was produced under simultaneous application of 60MPa pressure and the induced current. The average grain size of <TEX>$WSi_2$</TEX> was about <TEX>$5.2{\mu}m$</TEX>. The hardness and fracture toughness values obtained were 1700kg/<TEX>$mm^2$</TEX> and <TEX>$4.4MPa{\cdot}m^{1/2}$</TEX>, respectively.

One step synthesis of dense MoSi 2–SiC composite by high-frequency induction heated combustion and its mechanical properties

Dense MoSi 2–SiC composite was synthesized by high-frequency induction heated combustion synthesis method within 2 min in one step from elemental powders of Mo, Si and C. Simultaneous combustion synthesis and densification were carried out under the combined effect of an induced current and mechanical pressure. Highly dense MoSi 2–SiC with relative density of up to 98% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size of MoSi 2 and SiC were about 3.5 and 1.5 μm, respectively. And minor amount of Mo 5Si 3C was present. The fracture toughness and hardness values obtained were 4.8 MPa m 1/2 and 1410 kg/mm 2, respectively.

Simultaneous synthesis and consolidation process of ultra-fine WSi 2–SiC and its mechanical properties

Dense WSi 2–SiC composite was synthesized by high-frequency induction heated combustion synthesis (HFIHCS) method within 2 min in one step from powders of WC and Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense WSi 2–SiC with relative density of up to 97% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size of WSi 2 and SiC were about 0.78 and 0.56 μm, respectively. The hardness and fracture toughness values obtained were 1790 kg/mm 2 and 4.4 MPa m 1/2, respectively.