Mechanical properties of quartz ceramics at their service temperature

1989 ◽  
Vol 46 (10) ◽  
pp. 414-417
Author(s):  
V. G. Panteleev ◽  
N. V. Klocheva ◽  
A. V. Strui ◽  
K. S. Ramm
Keyword(s):  
Mechanical Properties ◽  
Service Temperature ◽  
Quartz Ceramics

Effect of elevated in-service temperature on the mechanical properties and microstructure of particulate-filled epoxy polymers

2019 ◽  
Vol 170 ◽  
pp. 108994 ◽  
Author(s):  
Mojdeh Mehrinejad Khotbehsara ◽  
Allan Manalo ◽  
Thiru Aravinthan ◽  
Kakarla Raghava Reddy ◽  
Wahid Ferdous ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Service Temperature ◽  
Epoxy Polymers

scholarly journals Mechanical Properties of a Thermally-aged Cast Duplex Stainless Steel by in Situ Tensile Test at the Service Temperature

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 317 ◽  
Author(s):  
Qingdong Zhang ◽  
Sida Ma ◽  
Tao Jing
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Thermal Aging ◽  
Austenite Phase ◽  
Ferrite Phase ◽  
Service Temperature

Z3CN20.09M cast duplex stainless steel (CDSS) has been used for primary coolant water pipes in pressurized water reactors due to its excellent mechanical properties. Such pipes operate at an elevated service temperature (~320 °C) and experience issues of thermal aging embrittlement. In situ tensile tests were conducted to investigate the deformation mechanisms of Z3CN20.09M CDSS after long-term thermal aging at 475 °C for up to 2000 h in both optical microscope and scanning electron microscope at 320 °C. For the 320 °C tests, the tensile stress and other mechanical properties, e.g. the yield stress and the ultimate tensile strength, increase during the thermal aging process and recover to almost the same level as the unaged condition after annealing heat-treatment, which is caused by the formation and dissolution of precipitation during aging and anneal heat-treatment, respectively. For the slip mechanism, straight slip lines form first in the austenite phase. When these slip lines reach the austenite/ferrite interface, three kinds of slip systems are found in the ferrite phase. During the fracture process, the austenite phase is torn apart and the ferrite phase shows a significant elongation. The role of the ferrite phase is to hold the austenite matrix, thus increasing the tensile strength of this steel.

Effect of service temperature on structure and mechanical properties of polyamide 6 & 66 tyre cords

2010 ◽  
Vol 18 (4) ◽  
pp. 781-792 ◽  
Author(s):  
Soghra Ramazani ◽  
Mohammad Morshed ◽  
Mohammad Ghane
Keyword(s):  
Mechanical Properties ◽  
Polyamide 6 ◽  
Service Temperature

scholarly journals All acrylic-based thermoplastic elastomers with high upper service temperature and superior mechanical properties

2017 ◽  
Vol 8 (37) ◽  
pp. 5741-5748 ◽  
Author(s):  
Wei Lu ◽  
Yangyang Wang ◽  
Weiyu Wang ◽  
Shiwang Cheng ◽  
Jiahua Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Elastomers ◽  
Service Temperature ◽  
Superior Mechanical Properties

All acrylic-based thermoplastic elastomers (TPEs) offer potential alternatives to the widely-used styrenic TPEs.

Structural, thermal and rheological studies on newly developed polyesters randomly copolymerized with poly (tetramethylene glycol) (PTMG)

2008 ◽  
Vol 1151 ◽  
Author(s):  
Matsumoto Osamu ◽  
Hotta Atsushi
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Ethylene Terephthalate ◽  
Elastic Recovery ◽  
Crystallization Rate ◽  
Service Temperature ◽  
Recovery Test ◽  
Tensile Tester ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

ABSTRACTPoly (cyclohexanedimethanol cyclohexanedicarboxlic acid) (PCC), a fairly newly synthesized polyester, has been studied. Having a good experience of increasing both thermal stability and service temperature when applied to typical polymers, poly (tetramethylene glycol) (PTMG) was selected as a softening agent that was randomly copolymerized into the PCC chains. Another widely-used polyester, poly (ethylene terephthalate) (PET) was also produced in order to investigate the effect of PTMG, which was compared with the properties of the newly developed random PCC-PTMG copolymers (PCCP). In this study, the crystalline structures, the thermal and the mechanical properties of both PCC and PET containing different ratios of the random segment of PTMG were investigated by differential scanning calorimetery (DSC) and tensile tester.It was found that the crystallization rate of pure PCC was significantly slow, whereas for PCCP, PTMG effectively accelerated the crystallization rate with increasing PTMG, and the sample with 25 wt% of PTMG had the fastest crystallization rate in all PCCP samples. Here, the PTMG acted as an accelerator, simultaneously depressing the movement of PCC molecular chains. The elastic recovery test indicated that the ability of PTMG as a softening agent was highly demonstrated at 20 wt% of PTMG. The results of PCCP were compared with those of PET-PTMG copolymers (PETP) and it was found that there were optimum values of PTMG for the crystallization rate on both samples. Additionally, the results of the elastic recovery test indicated that the softening effects observed in PCCP were more pronounced than those observed in PETP.

Hot Working Behavior of Casting Thermo-Span Alloy

2014 ◽  
Vol 788 ◽  
pp. 504-510 ◽  
Author(s):  
Lian Xu Yu ◽  
Zhou Bo Zhang ◽  
Lin Jie Huang ◽  
Wei Hong Zhang ◽  
Xin Xin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Expansion ◽  
Dynamic Recrystallization ◽  
Hot Working ◽  
Strain Rates ◽  
Surface Cracks ◽  
Service Temperature ◽  
Good Surface ◽  
Low Thermal Expansion ◽  
Oxidation Resistant

Thermo-Span alloy is an oxidation resistant, low thermal expansion superalloy with good mechanical properties at the service temperature. This paper investigated the hot working behavior of casting Thermo-Span alloy deformed at 900~1150°C, with strains of 20%, 40% and 60% at strain rates of 1 and 10 s-1. Dynamic recrystallization (DRX) grains were formed at 1110°C with a strain of 20%, at 1050°C with a strain of 40%. Increasing the deformation rate and strain can promote the DRX. However, when the strain exceeded 60% or the deformation temperature was above 1150°C with 40% strain, the surface cracks occurred, indicating that the alloy should be deformed in one heat no larger than 60%. By forging and rolling at 1050°C, Thermo-Span alloy with good surface quality and homogeneous grains was produced, and the tensile properties were still acceptable.

Silica-Reinforced Natural Rubber with Epoxidized Low Molecular Weight Rubber as a Compatibilizer

2013 ◽  
Vol 747 ◽  
pp. 522-525 ◽  
Author(s):  
Prachid Saramolee ◽  
Kannika Sahakaro ◽  
Natinee Lopattananon ◽  
Wilma Dierkes ◽  
Jacques W.M. Noordermeer
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Glass Transition ◽  
Natural Rubber ◽  
Periodic Acid ◽  
Dynamic Mechanical Properties ◽  
Low Molecular Weight ◽  
Service Temperature ◽  
Dynamic Mechanical ◽  
Tan Δ

This work investigates the effect of epoxidized low molecular weight natural rubber (ELMWNR) in silica-filled NR compounds on processing, mechanical and dynamic mechanical properties. The ELMWNRs with mol% epoxide groups varying from 0-50 and molecular weight in a range of 50,000-60,000 g/mol were prepared from depolymerization of epoxidized natural rubber using periodic acid in latex state. They were then added in the silica-filled NR compounds as a compatibilizer at varying loading from 0-15 phr. The addition of ELMWNR decreases compound viscosity and Payne effect, i.e. filler-filler interaction. The optimal mechanical properties of silica-filled vulcanizates are observed at the ELMWNR-28 (28 mol% epoxide) loading of 10 phr. The incorporation of ELMWNR with 28 and 51 mol% epoxide groups into NR compounds introduces a second glass transition temperature and affects on their dynamic mechanical properties. Higher epoxide content leads to higher Tan δ of the rubber vulcanizates in the range of normal service temperature.

Effect of in situ synthesis of Si2N2O on microstructure and the mechanical properties of fused quartz ceramics

2020 ◽  
Vol 46 (7) ◽  
pp. 8725-8729 ◽  
Author(s):  
Yingxia Wang ◽  
Qinglin Hou ◽  
Liang Tian ◽  
Pingfei Chen ◽  
Jiakai Xiao
Keyword(s):  
Mechanical Properties ◽  
In Situ Synthesis ◽  
Fused Quartz ◽  
Quartz Ceramics

Study on the Copolymer Properties of Phenolic Resin-Epoxy Resin

2012 ◽  
Vol 531-532 ◽  
pp. 73-78 ◽  
Author(s):  
Xiao Yan Zhang
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Epoxy Resin ◽  
Phenolic Resin ◽  
Curing Agent ◽  
Transition Temperatures ◽  
Service Temperature ◽  
Glass Transition Temperatures ◽  
Reactive Process ◽  
Ft Ir

The properties of phenolic-epoxy copolymer were studied in this paper. DSC was used to detect the possibility of copolymerization between phenolic resin and epoxy resin. FT-IR monitored the reactive process of mixed resin in various temperature stages. DMA revealed that the copolymer possessed high moduli and glass transition temperatures. The result showed that phenolic-epoxy copolymer can react in appropriate proportion. It is better for the copolymer system to avoid rich epoxy without curing agent. The properties of the copolymer could be increased when sacrificed some excellent properties of phenolic and epoxy. The copolymer 70% phenolic & 30% epoxy and 60% phenolic & 40% epoxy posses higher service temperature, lower volumetric shrinkage and excellent mechanical properties.

scholarly journals Effect of Service Temperature on Mechanical Properties of Adhesive Joints after Hygrothermal Aging

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3741
Author(s):  
Wei Tan ◽  
Jingxin Na ◽  
Zhaofeng Zhou
Keyword(s):  
Mechanical Properties ◽  
Normal Stress ◽  
Failure Modes ◽  
Failure Load ◽  
Adhesive Joints ◽  
Service Temperature ◽  
Polyurethane Adhesive ◽  
Interface Failure ◽  
Static Tests ◽  
Hygrothermal Aging

Polyurethane adhesive and aluminum alloy were selected to make adhesive joints. Butt joints tested at different loading angles (0°, 45°, and 90°) using a modified Arcan fixture were selected to represent three stress states (normal stress, normal/shear combined stress, and shear stress, respectively). Firstly, the accelerated aging tests were carried out on the joints in a hygrothermal environment (80 °C/95% RH). The quasi-static tests were carried out at different temperatures (−40 °C, 20 °C, and 80 °C) for the joints after hygrothermal aging for different periods. The variation rules of the joints’ mechanical properties and failure modes with different aging levels were studied. The results show that the failure load of the joints was obviously affected by stress state and temperature. In the low-temperature test, the failure load of the joints decreased most obviously, and the BJ was the most sensitive to temperature, indicating that the failure load decreased more with the increase of the normal stress ratio in the joint. Through macroscopic and SEM analysis of the failure section, it was found that the hydrolysis reaction of polyurethane adhesive itself and the interface failure of the joints were the main reasons for the decrease of joint strength. The failure models were established to characterize the adhesive structure with different aging levels at service temperature.

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