Ball Milling of WC-Co Powder as Injection Molding Feedstock

In this paper, an attempt has been made to mill constituent of WC and Co powder towards achieving volumetric percentage of WC (91%) and Co (9%). The ball milling technique was conducted under dry and wet condition using various milling parameters, rotation speed, time and ethanol as milling medium. Electron dispersive spectrometer (EDS) detected the elemental distribution, whilst SEM and particle size analysis was done to study the effect of changes in particle morphology and reduction of particle size. As a conclusion, powder milled by parameter of wet milling by ethanol, speed of rotation at 250 rpm and 90 minutes of milling time exhibits best results in term of volumetric percentage of 91%WC and 9%Co and particle size reduction.

Download Full-text

Preparation and Characterization of Betel Leaves (Piper betle Linn) Extract Nanoparticle with Ionic Gelation Method

Journal Of Tropical Pharmacy And Chemistry ◽

10.25026/jtpc.v5i1.224 ◽

2020 ◽

Vol 5 (1) ◽

Author(s):

Dwi Saryanti ◽

Dian Nugraheni ◽

Nisa Sindi Astuti

Keyword(s):

Particle Size ◽

Zeta Potential ◽

Leaf Extract ◽

Particle Morphology ◽

Particle Size Analysis ◽

Size Analysis ◽

Piper Betle ◽

Ionic Gelation ◽

Betel Leaf

Nanoparticles are used in drug delivery which can increase mass transfer so increase the absorption and effectiveness of the drug. Therefore, its prospect to improve antibacterial and antioxidants activities of betel leaves. The research aimed to preparation and characterization of betel leaf extract using ionic gelation technique. The formulation of nanoparticles from betel leaf extract with ionic gelation method using alginate and CaCl2 with a ratio of 2.5: 1. The characterization of the nanoparticles includes particle size analysis, zeta potential, particle morphology and determination of flavonoid content. Particle size analysis demonstrated that the betel leaf extract nanoparticles had a particle size of 243,03 ± 1,48 nm, zeta potential of -23,0 ± 0,35 mV and morphology of particle showed that a flat shape. The betle leaf exctract nanoparticle positively contained flavonoid with Rf 0.7 equivalent to quercetin. The betel leaf extract can be made nanoparticles with ionic gelation method using alginate and CaCl2.

Download Full-text

Effect of Nano Size Powder of Polygonum minus by Ball Milling

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1109.333 ◽

2015 ◽

Vol 1109 ◽

pp. 333-339 ◽

Cited By ~ 1

Author(s):

A.S. Nadzirah ◽

M. Rusop ◽

I. Abdul Latif

Keyword(s):

Particle Size ◽

Ball Milling ◽

Physicochemical Characterization ◽

Preventive Health Care ◽

Particle Size Analysis ◽

Milling Process ◽

Correlation Spectroscopy ◽

Size Analysis ◽

Stomach Pain ◽

Polygonum Minus

Polygonum minus or ‘kesum’ is a traditional Malaysian plant used as flavoring agent and recommended for digestive disorders as well as stomach pain. The leaves are often eaten fresh as a vegetable (salad and ulam), especially among the Malay communities for preventive health care. The physicochemical characterization of nanosize of Polygonum minus in wet mill and dry mill was influenced by ball milling process using planetary ball mill. Particle size analysis employing photon correlation spectroscopy was carried out to record the effect of milling parameters on the particle size produced. Fourier Transform Infra-Red (FTIR) spectrum was recorded for functional groups analysis. The result showed that after ball milling, the average size of particles was reduced while FTIR results showed the peak at region of 1,600-1,500 cm-1 is due to the stretching vibration of carbonyl group and 1300-1,000 cm1 indicate a stretching of C-H group.

Download Full-text

Synthesis and Microstructural Characterization of Cu2MnSnS4/Se4 Nano-Thermoelectric Material

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f9066.038620 ◽

2020 ◽

Vol 8 (6) ◽

pp. 3749-3755

Keyword(s):

Particle Size ◽

Ball Milling ◽

System Analysis ◽

Microstructural Analysis ◽

Microstructural Characterization ◽

High Energy ◽

Particle Size Analysis ◽

Size Analysis ◽

Elemental Mapping ◽

Average Size

In the present study Cu2MnSnS4 /Se4 nanostructured material is synthesized using mechanical alloying. The elemental powders were alloyed in a high-energy ball mill under the following conditions: milling time 25 hours, ball-to-powder mass ratio (BPR) 10:1 and a rotation speed of 300 rpm. Detailed investigation of the microstructure of the synthesized alloy was carried out. The starting elemental powders size and morphology were characterized using Apreo field emission gun scanning electron microscope (FEGSEM). Elemental mapping of the synthesized alloy was characterized using energy dispersive spectroscopy (EDS) attached to FEGSEM system. Analysis of microstructure was performed using EDAX-TEAM advanced software. A dynamic laser light scattering was used for particle size analysis. The results showed that Cu2MnSnS4 /Se4 nanostructured is successfully synthesized by ball milling. The Z-average size distribution of the particle reveals that ball milling results in a considerable refining in the particle size from 44 micron down to 923.5 nm. Further, it was observed that 94.4% showed an average size of 725.8±233 nm. Microstructural analysis confirmed the formation of a homogenous structure of Cu2MnSnS4 /Se4 alloy in the powder and green samples. The elemental mapping confirmed the formation of solid solution of the processed alloy with homogenous distribution of all elements in the examined region. Quantitative analysis performed by EDAX-TEAM software confirmed the chemical composition and homogeneity of the processed material.

Download Full-text

AN INVESTIGATION INTO METHODS FOR THE PARTICLE-SIZE ANALYSIS OF UO2POWDER AND THE EFFECT OF BALL-MILLING ON SIZE DISTRIBUTION

Powder Metallurgy ◽

10.1179/pom.1965.8.15.003 ◽

1965 ◽

Vol 8 (15) ◽

pp. 38-63 ◽

Cited By ~ 3

Author(s):

C. C. BAZELL ◽

R. V. DAVIES

Keyword(s):

Particle Size ◽

Size Distribution ◽

Ball Milling ◽

Particle Size Analysis ◽

Size Analysis

Download Full-text

Experimental Study on the Preparation of Recycled Admixtures by Using Construction and Demolition Waste

Materials ◽

10.3390/ma12101678 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1678 ◽

Cited By ~ 8

Author(s):

Shujun Li ◽

Qiuyi Li ◽

Xiaolong Zhao ◽

Jianlin Luo ◽

Song Gao ◽

...

Keyword(s):

Particle Size ◽

Negative Impact ◽

Activity Index ◽

Particle Morphology ◽

Particle Size Analysis ◽

Construction And Demolition Waste ◽

Size Analysis ◽

Demolition Waste ◽

Different Types ◽

Advanced Analysis

The use of construction and demolition waste (CDW) to prepare recycled admixtures is of great significance for the complete resource reutilization of CDW. In this paper, different kinds of CDW were prepared into recycled powder (RP) with a specific particle size (0–45 µm or 0–75 µm). The fineness, water requirement ratio (WRR), fluidity, loss on ignition (LOI), strength activity index (SAI) and compatibility of cement and superplasticizer (CCS) were examined. The above test results were analyzed by advanced analysis tools, such as laser particle size analysis, XRD, XRF, DSC-TGA, SEM, and BET. The properties of different types of RPs varied greatly, which was closely related to the microstructure, particle morphology and chemical composition of the RP. The experimental results showed that all kinds of RPs after grinding had a high fineness and good particle size distribution, and the mineral composition was dominated by SiO2 with the content exceeding 50%. The WRR of various RPs was between 105% and 112%, and the SAI was between 68% and 78%, but the LOI varied greatly. Different types of RPs had a negative impact on the CCS, but the compatibility of cement and naphthalene-based superplasticizer was less affected. The content of recycled brick powder (RBP) in a hybrid recycled powder (HRP) was an important factor. When the content of RBP in HRP exceeded 50%, the HRP could meet the basic performance requirements of fly ash.

Download Full-text