Processability of Thermoplastic Olefin Elastomers: Vacuum Sheet Forming

1983 ◽  
Vol 56 (1) ◽  
pp. 68-82 ◽  
Author(s):  
C. C. Ho ◽  
E. G. Kontos
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
Tensile Stress ◽  
Flexural Modulus ◽  
Thermoplastic Elastomer ◽  
Sheet Forming ◽  
Melt Viscosity ◽  
Vacuum Forming ◽  
Temperature Impact ◽  
Thermoplastic Olefin

Abstract We have presented a method for evaluating the vacuum forming performance of polymers by comparing their forming window. The window is determined by (a) the sag of the heated sheet and (b) the material's ability to reproduce mold details. We also showed that the vacuum forming window of polypropylene homopolymer can be widened through modification with an olefinic thermoplastic elastomer. Compared to polypropylene homopolymer, TPE-modified polypropylene requires lower tensile stress to extend the sample at temperatures below the polypropylene melting point. In the melt stage. TPE modification enhances the melt viscosity of polypropylene. TPE modification increases significantly the low temperature impact of polypropylene. The flexural modulus becomes lower.

scholarly journals Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

2021 ◽  
Vol 9 (6) ◽  
pp. 604
Author(s):  
Du-Song Kim ◽  
Hee-Keun Lee ◽  
Woo-Jae Seong ◽  
Kwang-Hyeon Lee ◽  
Hee-Seon Bang
Keyword(s):  
Low Temperature ◽  
Yield Strength ◽  
Steel Plate ◽  
Weld Zone ◽  
Base Material ◽  
Hardness Test ◽  
Steel Plates ◽  
Hybrid Welding ◽  
Temperature Impact ◽  
Mn Steel

The International Maritime Organization has recently updated the ship emission standards to reduce atmospheric contamination. One technique for reducing emissions involves using liquefied natural gas (LNG). The tanks used for the transport and storage of LNG must have very low thermal expansion and high cryogenic toughness. For excellent cryogenic properties, high-Mn steel with a complete austenitic structure is used to design these tanks. We aim to determine the optimum welding conditions for performing Laser-MIG (Metal Inert Gas) hybrid welding through the MIG leading and laser following processes. A welding speed of 100 cm/min was used for welding a 15 mm thick high-Mn steel plate. The welding performance was evaluated through mechanical property tests (tensile and yield strength, low-temperature impact, hardness) of the welded joints after performing the experiment. As a result, it was confirmed that the tensile strength was slightly less than 818.4 MPa, and the yield strength was 30% higher than base material. The low-temperature impact values were equal to or greater than 58 J at all locations in the weld zone. The hardness test confirmed that the hardness did not exceed 292 HV. The results of this study indicate that it is possible to use laser-MIG hybrid welding on thick high-Mn steel plates.

Facile synthesis of high‐melting point spherical TiC and TiN powders at low temperature

2019 ◽  
Vol 103 (2) ◽  
pp. 889-898 ◽  
Author(s):  
Maoqiao Xiang ◽  
Miao Song ◽  
Qingshan Zhu ◽  
Chaoquan Hu ◽  
Yafeng Yang ◽  
...  
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
High Melting ◽  
High Melting Point ◽  
Facile Synthesis

Mycorrhiza does not alter low temperature impact on Gnaphalium norvegicum

Oecologia ◽  
2004 ◽  
Vol 140 (2) ◽  
pp. 226-233 ◽  
Author(s):  
Anna Liisa Ruotsalainen ◽  
Minna-Maarit Kytöviita
Keyword(s):  
Low Temperature ◽  
Temperature Impact

A Novel Latching Relay Fabricated Using an Oxide Molded Tungsten Process

2005 ◽  
Vol 872 ◽  
Author(s):  
J.G. Fleming ◽  
Michael Baker ◽  
David Luck
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Temperature ◽  
Tensile Stress ◽  
Vapor Deposition ◽  
Chemical Mechanical Polishing ◽  
Chemical Vapor ◽  
Metal Contacts ◽  
Cmos Compatible ◽  
Mems Device ◽  
Very High

AbstractIn this paper we describe an oxide molded tungsten process applied to the fabrication of a novel latching relay. The steps in the process are: deposition of a sacrificial oxide, patterning of the oxide, filling of the resulting mold with a blanket film of tungsten using chemical vapor deposition (CVD), and then the removal and planarization of excess tungsten through chemical mechanical polishing (CMP). The process for the incorporation of dielectric isolation has also been developed. The resulting tungsten structures are under high tensile stress, which appears to be compensated in process by the compressive stress of the oxide mold. All the steps are low temperature and the entire process is backend CMOS compatible. This process has been used to fabricate a latching relay which relies on the internal stress of the tungsten and always generates force in a pulling mode. Parts have been successfully fabricated and tested, the devices generate very high forces for a MEMS device and give reasonable contact resistances even without noble metal contacts.

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