scholarly journals Characterization of Rice Husk Fiber-Reinforced Polyvinyl Chloride Composites under Accelerated Simulated Soil Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Lei Wang ◽  
Chunxia He
Keyword(s):  
Thermal Expansion ◽  
Impact Strength ◽  
Water Absorption ◽  
Thermal Expansion Coefficient ◽  
Polyvinyl Chloride ◽  
Expansion Coefficient ◽  
Rice Husk ◽  
Fiber Reinforced ◽  
Aging Condition ◽  
Soil Aging

To study the effect of accelerated simulated soil aging on the physical, mechanical, and thermal behavior of rice husk fiber-reinforced polyvinyl chloride composites. The worst soil aging condition was determined using the orthogonal design method, and the physical, mechanical, and thermal properties of the composites were analyzed over 21 d. The results indicate that the worst soil-accelerated aging condition was as follows: soil temperature of 65°C, soil pH of 2.5, soil moisture content of 45%, and soil porosity (ratio of thick to thin) of 3 : 7. An extended aging time tends to cause poor interfacial bonding quality, and the presence of many microcracks reduced thermal stability and flexural and impact strength. Many fibers were exposed, which resulted in increasing 24 h water absorption and thermal expansion coefficient. The hardness, tensile strength, flexural strength, impact strength, and pyrolysis temperature of the composites (after 21 d of aging) decreased from 50 HRR, 17.42 MPa, 35.2 MPa, 3.19 kJ/m2, and 258.5°C to 26 HRR, 11.5 MPa, 16.8 MPa, 1.16 kJ/m2, and 251.3°C, respectively. The mass loss rate, 24 h water absorption, discoloration, and line thermal expansion coefficient of the composites increased from 0%, 4.19%, 0, and 28.43 to 2.9%, 7.92%, 29.03, and 29.98, respectively.

Lightweight Cellular Glass Composite from Eggshell and Glass Cullet Powder for Insulation and Bioactive Glass Applications

2020 ◽  
Vol 858 ◽  
pp. 151-156
Author(s):  
Nuchnapa Tangboriboon ◽  
Nathawith Ratchatawatanapipat ◽  
Kunanya Kongpaopong
Keyword(s):  
Thermal Expansion ◽  
Water Absorption ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Flat Glass ◽  
High Water ◽  
Glass Cullet ◽  
Molding Process ◽  
Glass Composites ◽  
Cellular Glass

Cellular glass composites can be made of waste flat glass or bottle glass added with eggshell powder 0, 1, 3 and 5%wt and then fired at 800° and 900°C for 1 h using compression molding process. Adding eggshell powder mixed with glass cullet affects to form open and closed pores and to decrease firing temperature, thermal expansion coefficient and light weight. However, adding high amount of eggshell powder affects to form an excessively amount of open and closed pores effect to increase water absorption. The standard Thailand Industries determines water absorption of glass foam less than 25% because high water absorption affects to decrease mechanical properties. Therefore, cellular glass composites added 1, 3 and 5%wt should not be fired at temperature higher than 800°C for 1h. In addition, the cellular glass composites added 1 %wt eggshell powder and fired at 900°C for 1 h still have low water absorption and low thermal expansion coefficient. Cellular glass composites are potential to apply for many industries such as construction, petroleum and petrochemical, insulation, medical and dental applications.

Fabrication and Characterization of Low Thermal Expansion Cordierite/Spodumene/Mullite Composite Ceramic for Cookware

2018 ◽  
Vol 766 ◽  
pp. 276-281
Author(s):  
Pranee Junlar ◽  
Thanakorn Wasanapiarnpong ◽  
Lada Punsukmtana ◽  
Noppasint Jiraborvornpongsa
Keyword(s):  
Thermal Expansion ◽  
Water Absorption ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Coefficient Of Thermal Expansion ◽  
Slip Casting ◽  
Ceramic Composites ◽  
Modulus Of Rupture ◽  
Mullite Phase ◽  
Low Thermal Expansion

Ceramic cookware can be taken a direct flame or stove top for the duration without damage. The selected materials must have low thermal expansion coefficient, high strength, low water absorption and high thermal shock resistance, reasonable in cost and easy to be produced. Cordierite and spodumene composite has been interested for ceramic cookware due to their fitted properties. In previous work, study in the cordierite-spodumene composite with low thermal expansion coefficient of 2.60 x 10-6 /°C when sintered at 1250 oC with a ratio of spodumene 60 wt% and cordierite 40 wt% can withstand the pot shape samples. However, the sample showed relatively high water absorption and low strength which was not appropriate for using in this application. In this research, mullite is added in the formula to improve strength and densification of ceramic composites. Spodumene, ball clay, calcined talc and calcined alumina are used as starting raw materials and formed by slip casting. All samples are sintered in a temperature range from 1250-1275 °C in an electric furnace. Water absorption and bulk density were tested by Archimedes method, modulus of rupture was tested by the three-point bending method, microstructure were investigated by SEM and the coefficient of thermal expansion was measured by dilatometer. It was found that the mullite phase was investigated when adding mullite more than 30 wt% in cordierite-spodumene composite.

Thermoelastic Properties of a Novel Fuzzy Fiber-Reinforced Composite

2013 ◽  
Vol 80 (6) ◽  
Author(s):  
S. I. Kundalwal ◽  
M. C. Ray
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Volume Fraction ◽  
Effect Of Temperature ◽  
Fiber Reinforced ◽  
Thermoelastic Properties ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Generalized Method Of Cells

The effective thermoelastic properties of a fuzzy fiber-reinforced composite (FFRC) have been estimated by employing the generalized method of cells approach and the Mori–Tanaka method. The novel constructional feature of this fuzzy fiber-reinforced composite is that the uniformly aligned carbon nanotubes (CNTs) are radially grown on the circumferential surface of the horizontal carbon fibers. Effective thermoelastic properties of the fuzzy fiber-reinforced composite estimated by the generalized method of cells approach have been compared with those predicted by the Mori–Tanaka method. The present work concludes that the axial thermal expansion coefficient of the fuzzy fiber-reinforced composite slightly increases for the lower values of the carbon fiber volume fraction, whereas the transverse thermal expansion coefficient of the fuzzy fiber-reinforced composite significantly decreases over those of the composite without CNTs. Also, the results demonstrate that the effect of temperature variation on the effective thermal expansion coefficients of the fuzzy fiber-reinforced composite is negligible.

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