A Novel Method to Fabricate High Strength Nanofiber Filaments: Morphology, Crystalline Structure, and Thermal and Mechanical Properties

2018 ◽  
Vol 19 (6) ◽  
pp. 1245-1254 ◽  
Author(s):  
Yi-qi Wang ◽  
Xin Zhang ◽  
Zhi-juan Pan
Keyword(s):  
Mechanical Properties ◽  
Crystalline Structure ◽  
High Strength ◽  
Thermal And Mechanical Properties ◽  
Novel Method

Solid State Bonding of CuCrZr to Duplex Stainless Steel

2013 ◽  
Vol 302 ◽  
pp. 136-139 ◽  
Author(s):  
Ho Sung Lee ◽  
Jong Hoon Yoon ◽  
Joon Tae Yoo ◽  
Ji Ung Choi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
High Temperature ◽  
Solid State ◽  
Duplex Stainless Steel ◽  
High Strength ◽  
Atomic Diffusion ◽  
Thermal And Mechanical Properties ◽  
Solid State Bonding ◽  
Duplex Steel

In the solid state bonding, joint are made by pressing surfaces together at high temperature so that a bond grows across the interface by atomic diffusion. In order to satisfy both requirements of thermal and mechanical properties of aerospace vehicle, conductive CuCrZr alloy was bonded to duplex steel with high strength. Solid state bonding was performed at 3 different pressure conditions and at temperatures of 850°C and 950°C. Microstructural and mechanical evaluation was performed to obtain the optimum joining condition.

Liquid Crystalline PET/60HBA-MWNTs Composite: Synthesis, Characterization, and Properties

2014 ◽  
Vol 668-669 ◽  
pp. 31-34
Author(s):  
Jiang Wei Wang ◽  
Xiao Mei Bai ◽  
Zong Hao Li ◽  
Yao Zhang ◽  
Yan Ping Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acetic Anhydride ◽  
Liquid Crystalline ◽  
Polymerization Process ◽  
Thermal And Mechanical Properties ◽  
Crystallization Property ◽  
Degradation Temperature ◽  
Novel Method ◽  
Liquid Crystalline Polyester

PET/60HBA-MWNTs Liquid Crystalline Polyester (LCP) composite was synthesis by melting polymerization process with a novel method of reacting in acetic anhydride solution. FTIR, XRD, POM, TGA and mechanical properties tests were applied for the characterization of modification of nanotube, crystallization property, thermal and mechanical properties. The results indicate that thermal and mechanical properties of LCP polyester are all enhanced with 0.3wt% MWNTs addition. The degradation temperature (Td) increased for 8°C and the modules, strength and breaking elongation are increased by 39.0%, 62.3% and 46.4% respectively.

Thermal and Mechanical Properties of Plasma Sprayed ZrO2-CeO2-Y2O3 Coatings

1996 ◽  
Author(s):  
S. Sodeoka ◽  
M. Suzuki ◽  
T. Inoue ◽  
K. Ueno ◽  
S. Oki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Base Layer ◽  
Thermal Barrier ◽  
Thermal And Mechanical Properties ◽  
Stabilized Zirconia ◽  
Layered Coating ◽  
Barrier Coating ◽  
Shock Resistance ◽  
Plasma Sprayed

Abstract Plasma sprayed ZrO2-CeO2 and ZrO2-CeO2-Y2O3 coatings were investigated to develop advanced thermal barrier coating (TBC) with improved thermal and mechanical properties. The addition of a large amount of CeO2 to ZrO2 decreased the thermal conductivity, but it also reduced the mechanical property like hardness. Addition of Y2O3 to ZrO2-CeO2 was effective to improve the hardness. Double layered coating composed of a low thermal conductive top layer, such as ZrO2-CeO2-Y2O3 and a high strength base layer like yttria stabilized zirconia was fabricated. It exhibited an excellent thermal shock resistance and high thermal barrier capability.

scholarly journals Comparative Studies on Crystallinity, Thermal and Mechanical Properties of Polyketone Grown on Plasma Treated CVD Graphene

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 919
Author(s):  
Sunghun Cho ◽  
Jun Seop Lee ◽  
Hyeji Jang ◽  
Seorin Park ◽  
Ji Hyun An ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plasma Treatment ◽  
Crystalline Structure ◽  
Chemical Vapor ◽  
Graphene Sheets ◽  
Thermal And Mechanical Properties ◽  
Cvd Graphene ◽  
Surface Functionality ◽  
Doped Graphene ◽  
Grown Graphene

In this work, we report a facile way to control crystalline structures of polyketone (PK) films by combining plasma surface treatment with chemical vapor deposition (CVD) technique. The crystalline structure of PKs grown on plasma-treated graphene and the resulting thermal and mechanical properties were systematically discussed. Every graphene sheet used in this work was produced by CVD method and the production of PKs having different crystallinity were performed on the O2- and N2-doped graphene sheets. It was evident that the CVD-grown graphene sheets acted as the nucleating agents for promoting the crystallization of β-form PK, while suppressing the growth of α-form PK crystals. Regardless of the increase in surface roughness of graphene, surface functionality of the CVD-grown graphene was found to be an important factor in determining the crystalline structure of PK. N2 plasma treatment of the CVD-grown graphene promoted growth of the β-form PK, whereas the O2 plasma treatment of CVD graphene led to transformation of the unoriented β-form PK into the oriented α-form PK. Thus, the resulting thermal and mechanical properties of the PKs were highly dependent on the surface functionality of the CVD graphene. The method of controlling crystalline structure of the PKs suggested in this study, is expected to be very effective in realizing the PK with good processability, heat resistance and mechanical properties.

Monomer Synthesis and Characterization of Novel Aromatic Polyamides

2012 ◽  
Vol 549 ◽  
pp. 45-49
Author(s):  
Wei Hu ◽  
Guang Xian Zhang ◽  
Feng Xiu Zhang ◽  
Hui Zheng ◽  
Ming Lu
Keyword(s):  
Mechanical Properties ◽  
Terephthalic Acid ◽  
High Performance ◽  
High Strength ◽  
Aromatic Polyamide ◽  
Synthesis And Characterization ◽  
Thermal And Mechanical Properties ◽  
Aromatic Polyamides ◽  
Ft Ir

Aromatic polyamides are high performance materials, having outstanding thermal and mechanical properties. Poly(2,5-Diamino-terephthalic acid) (PATA) was designed as a novel aromatic polyamide with high strength and modulus. In this paper, 2,5-Diamino-terephthalic acid (DATA), as a monomer of PATA, was synthesized from 2,5-Dimetyl-1,4-phenyldiamine (DPA). First step was the amidation of DPA by reacting with acetic anhydride to protect amido group. Then N-(4–Acetylamino-2,5-dimethyl–phenyl)-acetamide (AMPA) was oxidized by potassium permanganate. Finally, AMPA was hydrolyzed by sodium hydroxide and the monomer DATA was precipitated by hydrochloric acid around PH 5. DATA and all the intermediate products were characterized and confirmed by 1HNMR and FT-IR spectra. They were all in great agreement with the proposed structure. The overall yield of DATA was about 40.0%.

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