fabrication and properties of hfb2 mosi2 composites produced by hot pressing

EFFICIENT TECHNOLOGIES FOR THE FABRICATION OF DENSE ZrB2

using the Reactive Hot Pressing method displayed Vickers hardness of 13.6-16.7 GPa and KIC of 4.5-5.1 MPa m1/2, respectively. 15 cm Fig. 4. SEM back-scattered micrographs of dense SPSed ZZS (a), and HHS (b) products. Table 1. Properties of dense [%]

Fabrication, structure and properties of MoSi2

1992/6/30MoSi2-Nb composites The mechanical behavior of MoSi2-Nb composites was determined by means of three-point bend tests at room temperature and compressive creep tests at elevated temperatures. Figure 1 l(a) shows room tem- 90 D. E. Alman et aL / MoSi_,-base composites perature flexural stress vs. displacement curves for MoSi2 and MoSi2-20vol.%Nb particulate composite.

Phase Constitution and Mechanical Properties of Carbides

Carbides in the Ta–C system were prepared by hot‐pressing mixed powders of TaC and Ta in C/Ta atomic ratios of 1.0, 0.9, 0.8, 0.7, and 0.6 at 1800 C for 2 h. The compositions, 1.0, 0.9, and 0.8, produced single face‐centered‐cubic (fcc) TaC y phase with C/Ta ratios essentially the same as the starting compositions and densities exceeding 96.5% of theoretical.

Fabrication and mechanical properties of SiCw/MoSi2–SiC

2012/11/1SiC–MoSi 2 composites have been synthesized by hot-pressing, mechanically-assisted combustion, high-frequency induction heated combustion, microwave sintering, and reactive infiltration,,,, . Among the above methods, the reactive infiltration method, in which MoSi 2 –Si and Si–Mo alloys were used as infiltrates, has the merits of LSI except for the higher infiltration temperature.

Processing and Characterization of Zr

The fabrication of MB2-SiC and MB2-MC-SiC (M=Zr, Hf, Ta) Ultra High Temperature Ceramics (UHTCs) is investigated in this work by combining Self-propagating High-temperature Synthesis (SHS) and Spark Plasma Sintering (SPS). Zr, Hf or Ta, B4C, Si, and graphite powders are first reacted by SHS to successfully form in-situ the desired composites. For the case of the Tabased systems, a 20 min ball

Preparation and characterization of high

Song G-M, Li Q, Wen G-W, et al. Mechanical properties of short carbon fiber-reinforced TiC composites produced by hot pressing . Mat Sci Eng A 2002, 326 : 240 - 248 . [24] Silvestroni L, Fabbriche DD, Melandri C, et al. Relationships between carbon fiber type and interfacial domain in ZrB2-based ceramics .

Mechanical and Tribological Behavior of Particulate

Aluminum Metal Matrix Composites (MMCs) sought over other conventional materials in the field of aerospace, automotive and marine applications owing to their excellent improved properties. These materials are of much interest to the researchers from few decades.

Fabrication and properties of HfB2 MoSi2 composites produced

Fabrication and properties of HfB 2 –MoSi 2 composites produced by hot pressing and spark plasma sintering Diletta Sciti,a) Laura Silvestroni, and Alida Bellosi CNR-ISTEC, Institute of Science and Technology for Ceramics, I-48018 Faenza, Italy (Received 10

Spark plasma sintering of ZrB2

Abstract The combination of the SHS technique and the Spark Plasma Sintering (SPS) technology was adopted in this work for the fabrication of fully dense 2-SiC and 2-MC-SiC (M = Zr, Hf) Ultra High Temperature Ceramics (UHTCs).Specifically, Zr or Hf, B 4 C, Si, and (for the cases of ternary systems) graphite powders were first reacted by SHS to successfully form the desired composites.

Mechanically Activated Combustion Synthesis of MoSi2

In the reported work, MoSi2-Mo5Si3 composites and several materials based on Mo5SiB2 phase have been obtained by mechanically activated self-propagating high-temperature synthesis (MASHS). Short-term milling of Mo/Si mixture in a planetary mill has enabled a self-sustained propagation of the combustion front over the mixture pellet, leading to the formation of MoSi2-T1 composites.

Ultrahigh

The most promising materials for the application are a family of ultrahigh temperature ceramics (UHTCs) comprising ZrB2 and HfB2, and composites of those ceramics with SiC. ZrB2 and HfB2 ceramics have high hardness and very high melting temperatures (3245 C for ZrB2 and 3380C for HfB2), and they form protective, oxidation resistant coatings and have low vapor pressures at potential use

Densification, microstructure and mechanical properties of ZrB2–SiCw ceramic composites

Conclusions ZrB2 –20 vol.%SiCw ultra-high temperature ceramics were produced by hot-pressing at a temperature of 1800 ? C for 60 min. The effect of the sintering additives of Al2 O3 plus Y2 O3 on densi?cation behavior, microstructure and mechanical properties was investigated.

Phase Constitution and Mechanical Properties of Carbides

Carbides in the Ta–C system were prepared by hot‐pressing mixed powders of TaC and Ta in C/Ta atomic ratios of 1.0, 0.9, 0.8, 0.7, and 0.6 at 1800 C for 2 h. The compositions, 1.0, 0.9, and 0.8, produced single face‐centered‐cubic (fcc) TaC y phase with C/Ta ratios essentially the same as the starting compositions and densities exceeding 96.5% of theoretical.

Session: COMPOSITES: Mechanical Properties Processing

Aluminum-based particulate composites have potential application in services requiring high strength combined with low density. We have used mechanical alloying followed by hot isostatic pressing (HIPing) to fabricate a series of Al-Si-C particulate composites.

Role of particle size and nature of the reactants on the

Aikin produced MoSh composites with 15-45% TiB 2 ZrB2 or HfB2 using the XD process [12,27,28]. As mentioned earlier, the best compromise in density and improvement in the mechanical properties seems to be achieved by compositing MoSi 2 with TiB 2 (Figure 2.3, Table 2.1).

Fabrication and properties of HfB2

The purpose of the present study is to investigate and compare the fabrication, microstructure and properties of 15 vol% of MoSi2 -HfB2 composites sintered by two different techniques: spark plasma sintering (SPS) and hot pressing (HP). Nearly full dense

Effect of SiCw volume fraction and cold pressure on

2019/12/4The alloy powder and SiCw reinforcement were ball milled, cold-pressed, sintered, hot extruded and solution aged to obtain excellent mechanical properties such as hardness and compressive strength. The microstructure and properties of the material were characterized by metallographic microscope, scanning electron microscope (SEM), EDS, x-ray diffraction (XRD), HV

Kazuhisa Shobu

The flexural strength of composites heat-treated at 1000 C (open porosity of ∼15%) was ∼300 MPa, whereas that of composites heat-treated at 1450 C (open porosity of ∼12%) was only ∼240 MPa. The heat-treatment temperatures before the impregnation step might control the interface properties between the fiber and the matrix.

Mechanically Activated Combustion Synthesis of MoSi2

2015/4/273 composites. The chemical oven technique has enabled fabrication of α−Mo/Mo 5 SiB 2 /Mo 3 Si (Mo−12Si−8.5B) alloys, which offer favorable combinations of high‐temperature mechanical properties andoxidationresistance. 34

Combustion Synthesis of MoSi2

MoSi2–Si3N4 composites was investigated by Manukyan et al. [17,18] using molten salt-assisted combustion synthesis, in which a series of experiments adopting the Mo–5Si–0.5NaCl–mSi 3 N 4 (0.7 m 1.65) samples was conducted in nitrogen from 1 to 5 MPa.

Synthesis and Characterization of Nanocrystalline

Synthesis and Characterization of Nanocrystalline MoSi2 by Mechanical Alloying and Heat Treating Synthesis and Characterization of Nanocrystalline MoSi2 by Mechanical Alloying and Heat Treating Erfanmanesh, Mohammad; Bakhshi, Saeed 2012-11-25 00:00:00 J Clust Sci (2013) 24:133–143 DOI 10.1007/s10876-012-0530-7 ORI G IN AL PA PER Synthesis and Characterization of Nanocrystalline

Oxidation Behavior of Molybdenum Silicides and Their Composites

Oxidation Behavior of Molybdenum Silicides and Their Composites K. Natesan Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439, USA and S. C. Deevi Research and Development Center, Philip Morris USA, Richmond, VA 23234 February

Fabrication and properties of HfB2–MoSi2 composites

Fabrication and properties of HfB2–MoSi2 composites produced by hot pressing and spark plasma sintering - Volume 21 Issue 6 - Diletta Sciti, Laura Silvestroni, Alida Bellosi HfB 2 –15 vol% MoSi 2 composites were produced from powder mixtures and densified through different techniques, namely hot pressing and spark plasma sintering.

Fabrication and properties of HfB2?MoSi2 composites

Fabrication and properties of HfB2?MoSi2 composites produced by hot pressing and spark plasma sintering Sciti, Diletta; Silvestroni, Laura; Bellosi, Alida Abstract Publication: Pub Date: June 2006 DOI: 10.1557/jmr.2006.0180 Bibcode: 2006JMatR..21 full text |

Tribological Characteristics of Al and Mg Nanocomposites

Alizadeh, A., Taheri-Nassaj, E.: Mechanical properties and wear behavior of Al–2 wt.% Cu alloy composites reinforced by B4C nanoparticles and fabricated by mechanical milling and hot extrusion. Mater Charact 67, 119–128 (2012). doi: 10.1016/j.matchar.2012

Kinetics and High

This study is devoted to the fabrication of the ZrB2–SiC–(MoSi2) compact ceramics according to hybrid technology (self-propagating high-temperature synthesis (SHS) + hot pressing), as well as to investigating its phase composition, structure, and high-temperature oxidation kinetics. Reaction mixtures are prepared according to the following scheme: mechanical activation (MA) of Si + C

Mechanical and Tribological Behavior of Particulate

Aluminum Metal Matrix Composites (MMCs) sought over other conventional materials in the field of aerospace, automotive and marine applications owing to their excellent improved properties. These materials are of much interest to the researchers from few decades.

Kazuhisa Shobu

The flexural strength of composites heat-treated at 1000 C (open porosity of ∼15%) was ∼300 MPa, whereas that of composites heat-treated at 1450 C (open porosity of ∼12%) was only ∼240 MPa. The heat-treatment temperatures before the impregnation step might control the interface properties between the fiber and the matrix.

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