An electrically conductive and ferromagnetic nano-structure manganese mono-boride with high Vickers hardness

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuailing Ma ◽  
Robert Farla ◽  
Bao Kuo ◽  
Akhil Tayal ◽  
Yongsheng Zhao ◽  
...  
Keyword(s):  
Physical Properties ◽  
Magnetic Materials ◽  
Vickers Hardness ◽  
Electrically Conductive ◽  
Nano Structure ◽  
Ferromagnetic Properties ◽  
Mechanical Hardness

The combination of various desired physical properties greatly extends the applicability of materials. Magnetic materials are generally mechanically soft, yet the combination of high mechanical hardness and ferromagnetic properties is...

Recent Progress of Open-shell Organic Magnetic Materials and Their Aggregated States

2021 ◽  
Author(s):  
Shaoqiang Dong ◽  
Zhen Li
Keyword(s):  
Physical Properties ◽  
Magnetic Materials ◽  
Recent Progress ◽  
Organic Materials ◽  
Open Shell ◽  
Light Emitting ◽  
Organic Light ◽  
Organic Magnetic Materials ◽  
New Generation

In last decades, open-shell organic materials have attracted scientists’ great attention for their new chemical and physical properties, as well as their possible applications in new generation of organic light-emitting...

scholarly journals ELECTRICALLY CONDUCTIVE POLYCRYSTALLINE SUPER HARD MATERIAL BASED ON DIAMOND AND n-LAYER GRAPHENES

2018 ◽  
Vol 59 (8) ◽  
pp. 69
Author(s):  
Alexandr A. Shul’zhenko ◽  
Lucyna Jaworska ◽  
Alexandr N. Sokolov ◽  
Vladislav G. Gargin ◽  
Ludmila A. Romanko
Keyword(s):  
Physical Properties ◽  
High Pressures ◽  
Polycrystalline Diamond ◽  
Sharp Decrease ◽  
Hard Material ◽  
Electrically Conductive ◽  
High Pressures And Temperatures ◽  
Polycrystalline Diamond Compact

The electrical and physical properties of the electrically conductive super hard material on the basis of polycrystalline diamond and n-layered graphenes obtained at high pressures and temperatures were studied. It was established that the increase in graphene in a polycrystalline diamond compact leads to a sharp decrease in resistance. Wherein the hardness of the samples is slightly inferior to the hardness of diamond poly crystals obtained without the use of graphene.

scholarly journals Justification of the active method of protecting the insulation of submersible electric motors

2019 ◽  
Vol 124 ◽  
pp. 02003
Author(s):  
V. A. Trushkin ◽  
O. N. Churlyaeva ◽  
R. V. Kozichev
Keyword(s):  
Physical Properties ◽  
Electrical Breakdown ◽  
Electrical Equipment ◽  
Working Environment ◽  
Operating Parameters ◽  
Insulation Resistance ◽  
Electric Motors ◽  
Electrically Conductive ◽  
Active Method ◽  
Conductive Properties

The article provides an analysis of the properties of the working environment of submersible electrical equipment. The influence of the operating parameters of electrical equipment on the physical properties of the fluid (its electrically conductive properties) is considered. Mathematical confirmation of the implementation of electroosmosis in the capillaries of the insulation of submersible electric motors is given. The rationale for the active method of protecting submersible electrical equipment from reducing insulation resistance and preventing electrical breakdown is given.

Physical Property Evaluation of Four Composite Materials

2013 ◽  
Vol 38 (5) ◽  
pp. E144-E153 ◽  
Author(s):  
M Chang ◽  
J Dennison ◽  
P Yaman
Keyword(s):  
Flexural Strength ◽  
Physical Properties ◽  
Vickers Hardness ◽  
Dwell Time ◽  
Testing Machine ◽  
Surface Hardness ◽  
Composite Resins ◽  
Bending Test ◽  
Polymerization Shrinkage ◽  
Hardness Tests

SUMMARY Purpose The purpose of this study was to evaluate the physical properties of current formulations of composite resins for polymerization shrinkage, surface hardness, and flexural strength. In addition, a comparison of Knoop and Vickers hardness tests was made to determine if there was a correlation in the precision between the two tests. Materials and Methods Four composite resin materials were used: Filtek LS (3M-ESPE), Aelite LS (Bisco), Kalore (GC America), and Empress Direct (Ivoclar). Ten samples of each composite (shade Vita A2) were used. Polymerization shrinkage was measured with the Kaman linometer using 2-mm-thick samples, cured for 40 seconds and measured with digital calipers for sample thickness. Surface microhardness samples were prepared (2-mm thick × 12-mm diameter) and sequentially polished using 600-grit silicone carbide paper, 9 μm and 1 μm diamond polishing solutions. After 24 hours of dry storage, Knoop (200 g load, 15 seconds dwell time) and Vickers (500 g load, 15 seconds dwell time) hardness tests were conducted. Flexural strength test samples (25 × 2 × 2 mm) were stored in 100% relative humidity and analyzed using a three-point bending test with an Instron Universal Testing Machine (Instron 5565, Instron Corp) applied at a crosshead speed of 0.75 ± 0.25 mm/min. Maximum load at fracture was recorded. One-way analysis of variance and Tukey multiple comparison tests were used to determine significant differences in physical properties among materials. Results Filtek LS had significantly lower shrinkage (0.45 [0.39] vol%). Aelite LS demonstrated the greatest Knoop surface hardness (114.55 [8.67] KHN), followed by Filtek LS, Kalore, and Empress Direct (36.59 [1.75] KHN). Vickers surface hardness was significantly greater for Aelite LS (126.88 [6.58] VH), followed by Filtek LS, Kalore, and Empress Direct (44.14 [1.02] VH). Flexural strength (MPa) was significantly higher for Aelite LS and Filtek LS (135.75 [17.35]; 129.42 [9.48]) than for Kalore and Empress Direct (86.84 [9.04]; 92.96 [9.27]). There is a strong correlation between results obtained using Knoop and Vickers hardness tests (r=0.99), although Vickers values were significantly greater for each material. Conclusion Results suggest that Aelite LS possesses superior hardness and flexural strength, while Filtek LS has significantly less shrinkage compared with the other composites tested.

scholarly journals PHASE ANALYSIS AND PHYSICAL PROPERTIES OF B2O3-ADDED ZIRCON CERAMICS SINTERED AT 1300 °C

2021 ◽  
Vol 14 (1) ◽  
pp. 1-5
Author(s):  
Fikriyatul Azizah Su'ud ◽  
Suminar Pratapa ◽  
Musyarofah Musyarofah
Keyword(s):  
Phase Composition ◽  
Physical Properties ◽  
Vickers Hardness ◽  
Hardness Measurement ◽  
Solid State Reaction Method ◽  
Polished Surface ◽  
Sem Image ◽  
B2o3 Addition ◽  
Average Grain Size ◽  
Significant Difference

This study was aimed to know the effect of B2O3(boria) addition on the phase composition and physical properties of zircon ceramics.The raw zircon powder used in the study was a purified natural zircon sand from Kereng Pangi, Central Kalimantan, Indonesia. The zircon ceramics were prepared by a solid state reaction method with variation of B2O3 addition of 3 wt%, 6 wt% and 9 wt% and sintered at 1300 °C for 5h. The phase composition, density and microstructure were characterized using X-ray diffraction (XRD), densimeter and Scanning Electron Microscope (SEM), respectively. Vickers Hardness measurement was perfomed at the polished surface of the ceramics. Results showed that all samples contained pure zircon phase, i.e. there was no effect of B2O3 addition on the phase composition. In general, the density and hardness increased with increasing B2O3 addition, but addition up to 9 wt% is not optimum to achieve ultra-dense zircon ceramics. Furthermore, the SEM image also showed no significant difference in average grain size. The crystallite size has grown nearly eight times (325 nm) of its original powder. The Vickers hardness of the ceramics is not significantly influenced by the addition of boria. It appears that the boria failure to increase densification also results in the extent of contact between grains which then produces relatively large zircon grains.

scholarly journals Structure and Physical Properties of In2Se3, InSe and InSe Layered Crystals

2015 ◽  
Vol 16 (1) ◽  
pp. 44-48
Author(s):  
V. M. Kaminskii ◽  
Z. D. Kovalyuk ◽  
V. I. Ivanov
Keyword(s):  
Physical Properties ◽  
Single Crystals ◽  
Barrier Height ◽  
Solid Solutions ◽  
Energy Barrier ◽  
Crystallographic Axis ◽  
Magnetic Impurities ◽  
Ferromagnetic Properties ◽  
Temperature Dependences ◽  
Layered Crystals

The influence of magnetic impurities on the properties of In2Se3 and InSе layered crystals was studied. The results indicate the formation of substitutional solid solutions in the In2Se3<1 wt. % Mn>, InSe<0.5 wt. % Mn> single crystals. Temperature dependences of electroconductivity across (σ^С) and along (σ||С) the С crystallographic axis of doped crystals were measured in the range of 80–400 K. The values of energy barrier height between the crystal layers ΔЕδ were evaluated for In2Se3<Mn> and InSe<Mn>. It was established that InSe<Fe> crystals exhibit ferromagnetic properties.

DURAPERM

Alloy Digest ◽  
1966 ◽  
Vol 15 (7) ◽  
Keyword(s):  
Coercive Force ◽  
Physical Properties ◽  
Abrasion Resistance ◽  
Heat Treating ◽  
Magnetic Alloy ◽  
Soft Magnetic ◽  
Soft Magnetic Alloy ◽  
Mechanical Hardness

Abstract Duraperm is a soft magnetic alloy which exhibits high mechanical hardness and abrasion resistance in combination with a very low coercive force. It is recommended for applications requiring flux from minimum magnetization forces. This datasheet provides information on composition and physical properties. It also includes information on heat treating. Filing Code: Fe-28. Producer or source: Precision Metals Division, Hamilton Watch Company.

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