Glasses and Optical IR Fibers of As2Se3−xTex

MRS Proceedings ◽

10.1557/proc-88-177 ◽

1986 ◽

Vol 88 ◽

Author(s):

N. Croitoru ◽

N. Shamir ◽

D. Mendlovic ◽

J. Dror ◽

Y. Lereah

Keyword(s):

Mechanical Properties ◽

Cross Section ◽

Optical Fibers ◽

Chalcogenide Glasses ◽

Laser Light ◽

Raw Materials ◽

Physical And Mechanical Properties ◽

Infrared Region ◽

Light Wavelength ◽

Scanning Electron

ABSTRACTChalcogenide glasses of As2Se3−xTex (O<x<3) were made with special care, using very pure raw materials in order to avoid traces of oxygen. From these materials optical fibers were pulled, and the attenuation of CO2 laser light (wavelength λ = 10.6 μm) transmitted through these fibers was measured as a function of the Te content (x). The fiber's surface and cross-section were examined, using both the scanning electron and optical microscopes, and they directly revealed the increase in the concentration of the defects while x was increasing. The influence of the physical and mechanical properties on the concentration of defects was studied by measuring the optical absorption (α) and the microhardness (VH) of the raw materials. Slabs of As2Se3−xTex were made, and in these samples the α, VH, and glass transition temperature (Tg) as a function of x were measured. In the infrared region of the spectra at λ = 10.6 μm, the α in both the slabs and pulled fibers increased, and the VH and Tg decreased with the increase of x. This can be explained by the increase of the concentration of the defects (small crystallites) which appeared during the fiber pulling.

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KUALITAS PAPAN PARTIKEL BERDASARKAN KOMPOSISI SEKAM PADI DAN KAYU SENGON DENGAN VARIASI KADAR PEREKAT

JURNAL HUTAN LESTARI ◽

10.26418/jhl.v7i2.33693 ◽

2019 ◽

Vol 7 (2) ◽

Author(s):

Dendi Prayoga ◽

. Dirhamsyah ◽

. Nurhaida

Keyword(s):

Mechanical Properties ◽

Moisture Content ◽

Rice Husk ◽

Raw Materials ◽

Urea Formaldehyde ◽

Physical And Mechanical Properties ◽

Solid Content ◽

Particle Board ◽

Rice Husks ◽

Wood Processing

This research aimed to examine the physical and mechanical properties of particle boards based on the composition of raw materials and adhesive content and know the treatment of the composition of raw materials and the best adhesive content and meet the standard JIS A 5908-2003. The research was conducted at Wood Workshop Laboratory, Wood Processing Laboratory Faculty of Forestry,Tanjungpura University and Laboratory of PT. Duta Pertiwi Nusantara Pontianak. The adhesive used is Urea Formaldehyde with 52% Solid Content. Comparison of the composition of rice husks and sengon varies namely rice husk 50%: sengon 50%, rice husk 60%: sengon 40% and rice husk 70%: sengon 30% and variations in the levels of UF adhesives, namely 14% and 16%, with target density 0,7 gr/cm3. The particleboard was 30 cm x 30 cm x 1 cm Pressing at temperature 140oC for 8 minutes, with pressure of 25 kg/cm2. The research results of the study of density and moisture content meet the standards JIS A 5908-2003. The best particle values of rice husk and sengon with composition a ratio of rice husk 50%: sengon 50% , 16% adhesive content 16%, with density value of 0,7072 gr/cm3, moisture content 9,1949 %, thick development 12,3210 %, water absorption 68,8270 %, MOE 12110,7273 kg/cm2, MOR 161,0025 kg/cm2, firmness sticky 1,9320 kg/cm2, screw holding strength 62,3124 kg.Keywords : adhesive, composition, particle board, rice husk, sengon

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SIFAT FISIK DAN MEKANIK PAPAN GIPSUM DARI LIMBAH KAYU AKASIA (Acacia mangium Willd) BERDASARKAN KADAR GIPSUM DAN UKURAN SERBUK KAYU

JURNAL HUTAN LESTARI ◽

10.26418/jhl.v7i1.31800 ◽

2019 ◽

Vol 7 (1) ◽

Author(s):

Ridho Pratama ◽

M Dirhamsyah ◽

. Nurhaida

Keyword(s):

Mechanical Properties ◽

Raw Materials ◽

Acacia Mangium ◽

Physical And Mechanical Properties ◽

Powder Size ◽

Wood Powder ◽

Gypsum Board ◽

Randomized Design ◽

Gypsum Content ◽

Two Factors

This study aims to examine the physical and mechanical properties of gypsum board from Acacia mangium Willd wood waste based on gypsum content and wood powder size. This study refers to the JIS A 5417-1992 standard. This research were conducted at Wood Work Shop laboratory for the preparation of raw materials, Wood Technology laboratory Faculty of Forestry for board making and testing the physical properties of gypsum boards, and PT. Duta Pertiwi Nusantara laboratory to test the mechanical properties of the gypsum board. The material used is A. mangium W. Wood powder, gypsum flour, water and borax. The study uses Factorial Completely Randomized Design (CRD) with two factors, namely factor A (gypsum content) which consists of gypsum content of 400%, 500% and 600% of the weight of A. mangium W. wood powder, and factors B (wood powder size) consists of 20 mesh passes 40 mesh retained and 40 mesh passes 60 mesh retained. The results showed that the density (600% gypsum content of 40 and 60 mesh retained wood powder size), moisture content, thickness swelling, MOE (600% gypsum content of 40 and 60 mesh retained wood powder size) fulfill JIS A5417-1992 standard. The best gypsum board is gypsum board with gypsum content of 600% with a wood powder size is 40 mesh.Keyword: Acacia mangium, gypsum board, gypsum content, wood powder size.

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Thermal Shock Resistance of ZrO2 Fiber/Al2O3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.754 ◽

2011 ◽

Vol 306-307 ◽

pp. 754-757 ◽

Cited By ~ 1

Author(s):

Xian Qin Hou ◽

Jian Ye Liu ◽

He Yi Ge

Keyword(s):

Mechanical Properties ◽

Electron Microscope ◽

Water Absorption ◽

Thermal Shock ◽

Thermal Shock Resistance ◽

Sintering Temperature ◽

Physical And Mechanical Properties ◽

Shock Resistance ◽

Scanning Electron ◽

Absorption Measurements

The physical and mechanical properties of alumina (Al2O3) ceramics by introduction of zirconia (ZrO2) fiber were studied. ZrO2/Al2O3ceramics at different sintering temperature was investigated by porosity and water absorption measurements, flexual strength and thermal shock resistance analysis. Results showed that Al2O3 ceramics containing 15 wt% ZrO2fiber with sintering temperature of 1650°C exhibited good mechanical properties and thermal shock resistance. The porosity and water absorption were 7.4% and 0.69%, respectively. The flexual strength was 613 MPa and the thermal shock times reached 29 times. Scanning electron microscope (SEM) was used to analyze the microstructure of Al2O3 ceramics.

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Research on the Microstructure of Leather/Resin Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.833.326 ◽

2013 ◽

Vol 833 ◽

pp. 326-329 ◽

Cited By ~ 1

Author(s):

Hua Yong Zhang ◽

Xiao Jian Liu

Keyword(s):

Cross Section ◽

Polyester Resin ◽

Raw Materials ◽

Resin Composite ◽

Unsaturated Polyester ◽

Optical Microscope ◽

Environmental Scanning ◽

Resin Composites ◽

Leather Wastes ◽

Scanning Electron

Reuse of leather wastes has been paid much attention. In this article, the chrome tanned cattle (pig) leather and unsaturated polyester resin or epoxy resin were used as raw materials, leather/resin composite material was prepared. The composite sections were examined by optical microscope and environmental scanning electron microscope. By observing the cross section morphology, the performance of composites can be speculated, the effective direction for further research on leather/resin composites and development can be provided.

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SYNERGISTIC REINFORCEMENT OF ORGANOCLAY AND DOUBLE NETWORKING IN NATURAL RUBBER

Rubber Chemistry and Technology ◽

10.5254/rct.13.88909 ◽

2013 ◽

Vol 86 (2) ◽

pp. 205-217 ◽

Cited By ~ 2

Author(s):

Hedayatollah Sadeghi Ghari ◽

Zahra Shakouri

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Natural Rubber ◽

Physical And Mechanical Properties ◽

X Ray Diffraction ◽

Double Network ◽

X Ray ◽

Extension Ratio ◽

Curing Characteristics ◽

Scanning Electron

ABSTRACT Research was undertaken on natural rubber (NR) nanocomposites with organoclays. A double-network (DN) structure is formed when a partially cross-linked elastomer is further cross-linked during a state of strain. Two methods were used in the preparation of NR/organoclay nanocomposites: the ordinary method (single-network NR nanocomposite) and double-networked NR (DN-NR) nanocomposites. The single-networked NR nanocomposites were used for comparison. The effects of organoclay (5 phr) with a different extension ratio on curing characteristics, mechanical properties, hardness, swelling behavior, and morphology of single- and double-networked NR nanocomposites were studied. The results showed that double-networked NR nanocomposites exhibited higher physical and mechanical properties. The tensile strength of DN-NR nanocomposites increased up to 33 MPa (more than four times greater than that of pure NR) and then decreased with an increasing extension ratio. Modulus and hardness continuously increased with an increased extension ratio. The microstructure of the NR/organoclay systems was studied by X-ray diffraction and field emission scanning electron microscopy. The effects of different extension ratios on the dispersion of organoclay layers in the nanocomposites were investigated. Generally, results showed that the optimized extension ratio in DN nanocomposites was equal (or about or around) to α= 2.

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Investigation of deformation and microstructure of bainite in Cu-9.97%Al-4.62%mn alloy

Journal of Mining and Metallurgy Section B Metallurgy ◽

10.2298/jmmb120704004a ◽

2014 ◽

Vol 50 (1) ◽

pp. 87-90 ◽

Cited By ~ 1

Author(s):

E. Aldirmaz ◽

I. Aksoy

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Physical And Mechanical Properties ◽

Compression Stress ◽

X Ray Diffraction ◽

Deformation Effect ◽

X Ray ◽

Deformation Test ◽

Scanning Electron

In this study, some physical and mechanical properties in Cu-9.97%Al-4.62%Mn (wt%) alloy were investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and compression deformation test. Bainite phase were obtained in the samples according to SEM and XRD analyses. Compression stress was applied on the alloy in order to investigate the deformation effect on the bainite phase transformation. On the surface of the Cu-9.97%Al-4.62%Mn alloy after the deformation, both bainite and martensite variants formed.

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Study on Mechanical Property of Al2O3-Based Composite Ceramics Liner of Heavy-Medium Cyclone

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.581 ◽

2011 ◽

Vol 295-297 ◽

pp. 581-584

Author(s):

Li Qiang Zhang ◽

Ping Huo ◽

Yong Huang ◽

Peng Li ◽

Rong Yang

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Mechanical Property ◽

Scanning Electron Microscopy ◽

Particle Size ◽

Sintering Temperature ◽

Raw Materials ◽

Composite Ceramics ◽

Heavy Medium ◽

Scanning Electron

In laboratory condition, industrial zirconia and alumina were used as raw materials, whose particle size was controlled by ultrafine treatment of mechanical milling. The effects of different firing temperatures and soaking times on mechanical properties of Al2O3-based composite ceramics liner were researched. And the microstructure of samples was studied by scanning electron microscopy (SEM). The results indicate that mechanical properties of samples kept 3 h at sintering temperature of 1600°C with adding 30 wt% zirconia are the best.

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Effects of raw materials and process parameters on the physical and mechanical properties of flat pressed WPC panels

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2011.12.028 ◽

2012 ◽

Vol 43 (4) ◽

pp. 570-576 ◽

Cited By ~ 23

Author(s):

Jan T. Benthien ◽

Heiko Thoemen

Keyword(s):

Mechanical Properties ◽

Process Parameters ◽

Raw Materials ◽

Physical And Mechanical Properties

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Development of Fly Ash-Based Geopolymer Lightweight Bricks Using Foaming Agent - A Review

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.660.9 ◽

2015 ◽

Vol 660 ◽

pp. 9-16 ◽

Cited By ~ 3

Author(s):

Wan Mastura Wan Ibrahim ◽

Kamarudin Hussin ◽

Mohd Mustafa Al Bakri Abdullah ◽

Aeslina Abdul Kadir ◽

Mohammed Binhussain

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Building Material ◽

Raw Materials ◽

Construction Materials ◽

Physical And Mechanical Properties ◽

Foaming Agent ◽

Positive Effects ◽

The World ◽

Great Development

Bricks are widely used as a construction and building material due to its properties. Recent years have seen a great development in new types of inorganic cementitious binders called ‘‘geopolymeric cement’’ around the world. This prompted its use in bricks, which improves the greenness of ordinary bricks. The development of fly ash-based geopolymer lightweight bricks is relatively new in the field of construction materials. This paper reviews the uses of fly ash as a raw materials and addition of foaming agent to the geopolymeric mixture to produce lightweight bricks. The effects on their physical and mechanical properties have been discussed. Most manufactured bricks with incorporation of foaming agent have shown positive effects by producing lightweight bricks, increased porosity and improved the thermal conductivities of fly ash-based geopolymer bricks. However, less of performances in number of cases in terms of mechanical properties were also demonstrated.

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