Study on PbSn Composites Produced by Powder Metallurgy as Core Bullet Projectile

2013 ◽  
Vol 789 ◽  
pp. 60-65 ◽  
Author(s):  
Widyastuti ◽  
Vuri Ayu Setyowati ◽  
Taufik Akbar
Keyword(s):  
Compressive Strength ◽  
Energy Transfer ◽  
Electron Microscope ◽  
Powder Metallurgy ◽  
Scanning Electron Microscope ◽  
Performance Test ◽  
Mechanical Performance ◽  
Compression Tests ◽  
Compacting Pressure ◽  
Scanning Electron

PbSn composites have been prepared by powder metallurgy for Advance Energy Transfer Bullet Application. Sn compositions was variety 5, 10, 15wt%. The compacting pressure performed at 10, 15, and 20 MPa. Temperature and holding time of sintering constantly in 150OC for 2 hours. The microstructure and mechanical performance of PbSn composites are investigated by Scanning Electron microscope (SEM), and compression tests. The results show that the Pb-15%wtSn Composite which is compacted in 20 MPa has result greatest density which was 10.969 gr/cm3and the smallest porosity (1.5%). Mechanical performance test of PbSn composite show the greatest hardness, compressive strength and modulus elasticity reach are 11.01 HV, 46.82 MPa and 34.96 GPa

Investigations on Properties of Al-B4C Composites Synthesized through Powder Metallurgy Route

2016 ◽  
Vol 852 ◽  
pp. 93-97 ◽  
Author(s):  
Manickam Ravichandran ◽  
Arumugam Manikandan ◽  
Meenakshi Sundaram Omkumar
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Powder Metallurgy ◽  
Scanning Electron Microscope ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Sintering Process ◽  
Standard Powder ◽  
Powder Metallurgy Route ◽  
Scanning Electron

Powder metallurgy is a popular technique to synthesize metal matrix composites with uniform distribution of the reinforcements. The present work aims to synthesize Al-B4C composites through powder metallurgy route and study their properties. The compositions of the composites are Al-5%B4C, Al-10%B4C & Al-15%B4C. Blending of powders, compaction and sintering process were carried out as per standard powder metallurgy procedure. The distributions of the reinforcements were analyzed for the sintered specimens by the help of scanning electron microscope. The effect addition of B4C in the Aluminium matrix on the properties such as density, porosity, hardness and compressive strength were discussed. Results show that addition of B4C improves the properties of Al-B4C composites.

Microscopic Study of Smooth Silver-plated Retention Pins in Amalgam

1980 ◽  
Vol 59 (2) ◽  
pp. 124-128 ◽  
Author(s):  
Y. Galindo ◽  
K. McLachlan ◽  
Z. Kasloff
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Microscopic Study ◽  
Strong Evidence ◽  
Mechanical Performance ◽  
Silver Layer ◽  
Mechanical Bonding ◽  
Bonding Characteristics ◽  
Scanning Electron

A silver-plating technique was developed in an effort to produce good mechanical bonding characteristics between stainless steelpins and amalgam. Metallographic microscope and scanning electron microscope (SEM) studies were made to assess the presence, or otherwise, of such a bond between (a) the silver layer plating and the surface of the stainless steel pins, and (b) and silver plating and the amalgam. Unplated stainless steel and sterling silver pins were used as a control and as a comparison, respectively. A "rubbing" technique of condensation was devised to closely adapt amalgam to the pins. It is concluded that there is strong evidence for the existence of a good bond between the plated pins and amalgam. The mechanical performance of the bond is discussed elsewhere. 1.

scholarly journals Microstructure Analysis and Strength Characterization of Recycled Base and Sub-Base Materials Using Scanning Electron Microscope

2020 ◽  
Vol 5 (9) ◽  
pp. 70
Author(s):  
Tanvir Imtiaz ◽  
Asif Ahmed ◽  
MD Sahadat Hossain ◽  
Mohammad Faysal
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Unconfined Compressive Strength ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Microstructural Properties ◽  
Reclaimed Asphalt ◽  
Base Materials ◽  
Scanning Electron

The reuse of recycled crushed concrete aggregate (RCCA) and reclaimed asphalt pavement (RAP) can provide a sustainable solution for the disposal of C&D waste materials instead of sending them to landfills. More importantly, it will conserve energy and reduce environmental concerns. Several states in the USA have been using RCCA and RAP as base materials for years, focusing on the quality of the recycled materials. The structure of Recycled Aggregate (RA) is more complex than that of Natural Aggregate (NA). RAs have old mortar adhered on them that forms a porous surface at the interfacial transition Zone (ITZ) and prevents new cement mix from bonding strongly with the aggregates. The objective of this study was to correlate microstructural properties such as microporosity, inter and intra aggregate pores with the unconfined compressive strength (UCS) of RAP and RCCA molds, mixed at different proportions. In this paper, the quantity of micropores and their effect on the strength of mixed materials is used as the basis of microstructural analysis of recycled concrete and reclaimed asphalt. Microstructural properties obtained from analyzing scanning electron microscope (SEM) images were correlated with unconfined compressive strength. Intra-aggregate and interaggregate pores were studied for different ratios of cement treated mixture of RAP and RCCA. The results show that addition of RAP considerably increases the number of pores in the mixture, which eventually causes reduction in unconfined compressive strength. In addition, significant morphological and textural changes of recycled aggregates were observed by SEM image analysis.

Study on Compressive Performances of Fiber Reinforced Mortar with the Application of Jute and PP

2014 ◽  
Vol 936 ◽  
pp. 1356-1360
Author(s):  
Jun Fei Yin ◽  
Yu Zhang ◽  
Ting Ting Yan ◽  
He Qiu
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polypropylene Fiber ◽  
Jute Fiber ◽  
Fiber Reinforced ◽  
Compressive Properties ◽  
Jute Fibers ◽  
Scanning Electron

In this study, jute fibers and polypropylene fiber (PP) were added into cement-based mortar to improve their compressive strength. Results obtained have shown that the compressive strength of the motar was perfect with jute fiber of 19mm length at the fiber contents of 0.8 kg·m-3. The reinforcing mechanism of fiber in the motar was analyzed by means of comparing of the mortar compressive properties under different circumstances, and the testing results of scanning electron microscope (SEM) and the addition of filament in experiments.

scholarly journals The Filler Effect on Compressive Strength of Sulfur Concrete

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Wenwei Lin ◽  
Fan Fei ◽  
Qunjie Li
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Fly Ash ◽  
Scanning Electron Microscope ◽  
Chemical Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Performance ◽  
Bonding Mode ◽  
Scanning Electron

The sulfur concrete samples were prepared by the optimized process, which were mixed with cement, fly ash and slag, respectively. The influence of the type and content of filler on the compressive strength of sulfur concrete was studied. The phase and micromorphology of filler and sulfur mixture were characterized by X-ray diffraction and scanning electron microscope, and the bonding mode was studied. The results show: the cement filler has the best effect on the compressive performance of sulfur concrete,and the compressive strength is 87.2 MPa by adding cement filler with the same quality as sulfur; there is no chemical reaction between filler and sulfur, and the filler is physically bonded to sulfur matrix.

scholarly journals Impact of Nanosilica in Ordinary Portland Cement Over Its Durability and Properties

2021 ◽  
Author(s):  
Gude Reddy Babu ◽  
Pala Gireesh Kumar ◽  
Nelluru Venkata Ramana ◽  
Bhumireddy Madhusudana Reddy
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Flexural Strength ◽  
Scanning Electron Microscope ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
X Ray Diffraction ◽  
Cement Strength ◽  
The Impact ◽  
Scanning Electron

The present examination illustrates the impact on the hardened and fresh cement mortar and cement with the inclusion of nanosilica of size 40 nm in various environmental conditions (UltraTech, India). It is quite notified that an elevation in compressive strength as well as flexural strength along with an improvisation in the performance and life span of cement mortar. The samples of M5 grade blended with a ninety percentage of concrete and remaining with nanosilica was identified to have a finer working elevation in as well as in standards when collated with the conventional cement mortar. The corollary of hardened and fresh cement, strength parameters were looked upon with the aid of XRD (X-ray Diffraction). Also, the SEM (Scanning Electron Microscope) test holds a predominant role in analysis.

scholarly journals Microstructure Analysis and Strength Characterization of Recycled Base and Subbase Materials Using Scanning Electron Microscope

2020 ◽  
Author(s):  
Tanvir Imtiaz ◽  
Asif Ahmed ◽  
MD Sahadat Hossain ◽  
Mohammad Faysal
Keyword(s):  
Compressive Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Unconfined Compressive Strength ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Microstructural Properties ◽  
Reclaimed Asphalt ◽  
Scanning Electron

The reuse of recycled crushed concrete aggregate (RCCA) and reclaimed asphalt pavement (RAP) can provide a sustainable solution for the disposal of C&D materials instead of sending it to landfill. More importantly, it will save energy and reduce impact on the environment. Several states in USA are using RCCA and RAP as base materials for years, focusing on the quality of the recycled materials. The structure of Recycled Aggregate (RA) is more complex than Natural Aggregate (NA). RAs have old mortar adhered on them that forms a porous surface at interfacial transition Zone (ITZ) and prevents new cement mix from bonding strongly with the aggregates. The objective of this work was to correlate microstructural properties like micro-porosity, inter and intra aggregate pores with the unconfined compressive strength (UCS) of RAP and RCCA molds, mixed at different proportions. In this paper, the quantity of micro-pores and their effect on the strength of mixed materials is used as the basis of microstructural analysis of recycled concrete and reclaimed asphalt. Microstructural properties obtained from the analysis of scanning electron microscope (SEM) images were correlated with unconfined compressive strength. Intra-aggregate and inter-aggregate pores were studied for different ratios of cement treated mixture of RAP and RCCA. The results show that the number of pores in the mixture increases considerably by adding RAP, which eventually causes reduction in unconfined compressive strength. In addition, significant morphological and textural changes of recycled aggregates were observed by SEM image analysis.

The Impact of Lithium Polysilicate on the Microstructure of Sand-Lime Products

2011 ◽  
Vol 250-253 ◽  
pp. 718-721 ◽  
Author(s):  
Ryszard Dachowski ◽  
Zdzislawa Owsiak
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Calcium Silicate ◽  
The Impact ◽  
Scanning Electron

The general attributes of calcium silicate products have been investigated in several studies. In this paper, we propose to use a specific modifier i.e. lithium polysilicate solution in order to examine and improve compressive strength of sand-lime bricks. The research was examined by scanning electron microscope (SEM). The main objective was to determine the phase composition in the structure of the sand-lime products.

Effect of Chelating Additive on Pore Structure and Mechanical Property of Mortar under Different Curing Conditions

2019 ◽  
Vol 944 ◽  
pp. 1172-1178
Author(s):  
Peng He ◽  
Rui Yang Wang ◽  
Ya Gang Zha ◽  
Jian Ying Yu
Keyword(s):  
Mechanical Property ◽  
Compressive Strength ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Calcium Silicate Hydrate ◽  
Water Immersion ◽  
Hydration Products ◽  
Curing Conditions ◽  
Ca Mortar ◽  
Scanning Electron

Effect of chelating additive on microstructure, hydration products and mechanical property of mortar under different curing conditions was investigated. The microstructure was tested by nuclear magnetic resonance and scanning electron microscope. And the chemical composition of hydration products was analyzed by X-ray diffraction. The compressive strength was measured under different curing conditions at different curing age, including standard curing, water immersion, seawater immersion and salt mist curing. After curing for 28 days in water, compared to control mortar, the reduction ratio of harmful pores whose size larger than 0.1μm in mortar with chelating additive (CA mortar) was 14.6%, followed by 8.9%, 9.2% and 2.9% which was under standard curing, seawater immersion and salt mist curing, respectively. From the scanning electron microscope image, there were more needle-like and bar-like crystals in CA mortar making it more compact, which was mainly calcium silicate hydrate through component analysis. Besides, the raising percentage of compressive strength of CA mortar under water immersion is 28.6% compared to control mortar at the age of 28 days, followed by 26.8%, 21.8% and 16.3% which was under standard curing, seawater immersion and salt mist curing, respectively. The results indicate that chelating additive can enhance compactness and compressive strength of cement-based materials especially under water immersion by promoting the formation of calcium silicate hydrate.

Meso-Structure Design of B4C-Al/Al Composites by Hot Pressing

2016 ◽  
Vol 849 ◽  
pp. 801-806
Author(s):  
Hui Li ◽  
Yi Tan Zhang ◽  
Kei Ameyama ◽  
Hai Jun Yang ◽  
Zhi Guo Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Microscope ◽  
Powder Metallurgy ◽  
Scanning Electron Microscope ◽  
Deformation Mechanism ◽  
Mass Fraction ◽  
Structure Design ◽  
Powder Metallurgy Method ◽  
Scanning Electron

According to the theory of meso-structure design, milling powders were blended with un-milled Al particulate to increase ductility. Two kinds of Al particulate-toughened composites were fabricated by using powder metallurgy method, where the mass fraction of B4C in the B4C-Al agglomerate particles was 40%, but 32% and 16% in the whole composite. The microstructure of composites was examined by scanning electron microscope (SEM), and its mechanical properties were studied. The results indicate that Al particulate-toughened sample has a slight plasticity with bulks of aluminum alloy in the composite. But meso-structure design has no effect on improvement on the plasticity and toughness of the sample B4C-Al/Al (16%)(3#), where the mass fraction of B4C in the whole composite is 16%. In the present study, the strengthening and deformation mechanism of the composites were also discussed.

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