Effect of electrical field treatment on thermal conductivity and mechanical strength of carbon nanofiber/polymer composite sheets with high filler content

2021 ◽  
pp. 51683
Author(s):  
Masashi Haruki ◽  
Yuki Kaneda ◽  
Akihiro Tanaka
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
Polymer Composite ◽  
Carbon Nanofiber ◽  
Filler Content ◽  
Electrical Field

Polymer composite with enhanced thermal conductivity and mechanical strength through orientation manipulating of BN

2018 ◽  
Vol 160 ◽  
pp. 127-137 ◽  
Author(s):  
Jiantao Hu ◽  
Yun Huang ◽  
Xiaoliang Zeng ◽  
Qiang Li ◽  
Linlin Ren ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
Polymer Composite ◽  
Enhanced Thermal Conductivity

Effect of CNT/CNF on Thermal and Mechanical Properties of Cement Mortars

2014 ◽  
Vol 1049-1050 ◽  
pp. 234-237 ◽  
Author(s):  
Yu Han Zhao
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Carbon Nanotube ◽  
Mechanical Strength ◽  
Phase Change Materials ◽  
Carbon Nanofiber ◽  
Thermal And Mechanical Properties ◽  
Cement Mortars ◽  
Mechanical Performances

The research integrates both phase change materials (PCM) and carbon nanotube (CNT)/carbon nanofiber (CNF) into cement mortars to improve their thermal and mechanical performances. The PCM will improve the thermal storage capability of the cement mortars, while CNT/CNF can improve their mechanical strength and thermal conductivity. Experimental results show that addition of 1 wt. % CNT and CNF into the cement mortars with 5 wt.% PCM can increase their compressive strength by 23% and 8% respectively, and increase their thermal conductivity by 26% and 9% respectively.

Novel self-reinforcing ZrO2–SiO2 aerogels with high mechanical strength and ultralow thermal conductivity

2018 ◽  
Vol 44 (13) ◽  
pp. 15440-15445 ◽  
Author(s):  
Xianbo Hou ◽  
Rubing Zhang ◽  
Baolin Wang
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
High Mechanical Strength

scholarly journals Study of the Turning Nickel Base Alloy Pyromet® 31V (SAE HEV8)

2011 ◽  
Vol 278 ◽  
pp. 312-320 ◽  
Author(s):  
Marcos Valério Ribeiro ◽  
André Luís Habib Bahia
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
High Temperatures ◽  
Base Alloy ◽  
Production Costs ◽  
Machining Parameters ◽  
Nickel Base Alloy ◽  
Low Thermal Conductivity ◽  
Nickel Base ◽  
Coated Carbide

Considering the constant technological developments in the aeronautical, space, automotive, shipbuilding, nuclear and petrochemical fields, among others, the use of materials with high strength mechanical capabilities at high temperatures has been increasingly used. Among the materials that meet the mechanical strength and corrosion properties at temperatures around 815 °C one can find the nickel base alloy Pyromet® 31V (SAE HEV8). This alloy is commonly applied in the manufacturing of high power diesel engines exhaust valves where it is required high resistance to sulphide, corrosion and good resistance to creep. However, due to its high mechanical strength and low thermal conductivity its machinability is made difficult, creating major challenges in the analysis of the best combinations among machining parameters and cutting tools to be used. Its low thermal conductivity results in a concentration of heat at high temperatures in the interfaces of workpiece-tool and tool-chip, consequently accelerating the tools wearing and increasing production costs. This work aimed to study the machinability, using the carbide coated and uncoated tools, of the hot-rolled Pyromet® 31V alloy with hardness between 41.5 and 42.5 HRC. The nickel base alloy used consists essentially of the following components: 56.5% Ni, 22.5% Cr, 2,2% Ti, 0,04% C, 1,2% Al, 0.85% Nb and the rest of iron. Through the turning of this alloy we able to analyze the working mechanisms of wear on tools and evaluate the roughness provided on the cutting parameters used. The tests were performed on a CNC lathe machine using the coated carbide tool TNMG 160408-23 Class 1005 (ISO S15) and uncoated tools TNMG 160408-23 Class H13A (ISO S15). Cutting fluid was used so abundantly and cutting speeds were fixed in 75 and 90 m/min. to feed rates that ranged from 0.12, 0.15, 0.18 and 0.21 mm/rev. and cutting depth of 0.8mm. The results of the comparison between uncoated tools and coated ones presented a machined length of just 30% to the first in relation to the performance of the second. The coated tools has obtained its best result for both 75 and 90 m/min. with feed rate of 0.15 mm/rev. unlike the uncoated tool which obtained its better results to 0.12 mm/rev.

Enhanced Thermal Conductivity of Composite Materials by Filling Sheet and Fiber Under Effect of Filler Contact

2021 ◽  
Author(s):  
Xiao-jian Wang ◽  
Liang-Bi Wang
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Composite Materials ◽  
Thermal Resistance ◽  
Percolation Threshold ◽  
Filler Content ◽  
Interfacial Thermal Resistance ◽  
Combined Effects ◽  
Enhanced Thermal Conductivity ◽  
The Ideal

Abstract The most common non-granular fillers are sheet and fiber. When they are distributed along the heat flux direction, the thermal conductivity of composite increases greatly. Meanwhile, the filler contact also has large effect on the thermal conductivity. However, the effect of filler contact on the thermal conductivity of composite with directional fillers has not been investigated. In this paper, the combined effects of filler contact, content and orientation are investigated. The results show that the effect of filler orientation on the thermal conductivity is greater than filler contact in low filler content, and exact opposite in high filler content. The effect of filler contact on fibrous and sheet fillers is far greater than cube and sphere fillers. This rule is affected by the filler contact. The filler content of 8% is the ideal percolation threshold of composite with fibrous and sheet filler. It is lower than cube filler and previous reports. The space for thermal conductivity growth of composite with directional filler is still very large. The effect of interfacial thermal resistance should be considered in predicting the thermal conductivity of composite under high Rc (>10-4).

Preparation and Properties of Heat-Dissipation Coating Filled with Carbon-Based Filler

2017 ◽  
Vol 898 ◽  
pp. 1532-1538
Author(s):  
Yue Gao ◽  
Qian Jin Mao ◽  
Hai Wang ◽  
Zi Ming Wang ◽  
Su Ping Cui
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Heat Dissipation ◽  
Filler Content ◽  
Simulated Data ◽  
Content Type ◽  
Element Simulation ◽  
Method Of Solution ◽  
High Emissivity ◽  
Pure Resin

Aiming at the heat dissipation of equipment, and based on ANSYS finite element simulation of thermal conductivity of coatings, the heat-dissipation coating filled with graphite and carbon nanotubes respectively, which integrates heat conduction (high thermal conductivity) and radiation (high emissivity), was successfully prepared by the method of solution mixing. Meanwhile, the effects of filler content, type and shape on thermal conductivity and emissivity of the coating were also investigated. The results indicate that the rising tendency between the simulated data by FEM and experimental value is consistent, which has a certain directive significance. In addition, graphite can improve the thermal conductivity and emissivity of the coating effectively; however, the emissivity decreases when the content exceeds 23.08%. The carbon nanotubes can improve the thermal conductivity and emissivity simultaneously, the thermal conductivity is 2.3 times that of pure resin, and the emissivity is up to 0.91 at the 2.0% mass fraction of carbon nanotubes.

scholarly journals High-temperature dielectric paper with high thermal conductivity and mechanical strength by engineering the aramid nanofibers and boron nitride nanotubes

2021 ◽  
Vol 210 ◽  
pp. 110124
Author(s):  
Lihua Zhao ◽  
Chengmei Wei ◽  
Zihan Li ◽  
Wenfu Wei ◽  
Lichuan Jia ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Boron Nitride ◽  
Mechanical Strength ◽  
Boron Nitride Nanotubes ◽  
High Thermal Conductivity
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