The Improvement Method Design for β-SiC Recrystallization

2011 ◽  
Vol 55-57 ◽  
pp. 578-581
Author(s):  
Bing Quan He ◽  
Wen Ting Chen ◽  
Yang Zheng
Keyword(s):  
Production Process ◽  
Fine Particles ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
Impact Resistance ◽  
High Strength ◽  
Sic Ceramics ◽  
High Oxidation Resistance

Sintered SiC ceramics with difficulty, and its production process and production are more expensive, lower sintering temperature of SiC ceramics and look for new low-cost production process is the focus of materials research workers. Re-crystallization of SiC components of the raw materials requirements of high purity, can not add sintering aids, sintering temperature up to about 2450°C). In this paper, by improving and optimizing the existing production process, to lower the sintering temperature of the new methods and ideas, the study shows that: β-SiC will be added to the sintered α-SiC slurry, and the best particle size ratio of α: β = 15:1 mixture, at the same time, according to re-crystallization of SiC sintering theory, the fine particles (β-SiC, has played the role of sintering agent) adsorption in the coarse particle (α-SiC, the role of the support skeleton) and can greatly reduce the SiC Sintering temperature (50-100°C), and to improve the purity of α-SiC, the most economical way to prepare a high-density, high oxidation resistance, high impact resistance, high strength, high mechanical properties of recrystallized SiC powder .

Effects of Sintering Temperature and Porogen Addition on Properties of Low Cost Porous Mullite Ceramics

2015 ◽  
Vol 655 ◽  
pp. 114-117
Author(s):  
Na Na Xu ◽  
Shu Jing Li ◽  
Yuan Bing Li ◽  
Lin Yuan ◽  
Jin Long Zhang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
High Porosity ◽  
Mullite Phase ◽  
Best Value ◽  
Porous Mullite ◽  
Mullite Ceramics

In the present paper, low cost porous mullite ceramics with high porosity, high strength and low thermal conductivity were fabricated using ceramic waste powder and clay as raw materials, and sawdust as porogen. The correlation of phase composition and physicochemical properties of such porous mullite ceramics were researched by varying sintering temperature and the extra addition of sawdust. The results show that: The ceramics show the best comprehensive properties when the sintering temperature is 1400 oC and the addition of sawdust is 30wt%. The results of SEM and EDS analysis confirm that new mullite phase is generated in the ceramics, which can strengthen the ceramics. And the best value of the bulk density, apparent porosity, cold crushing strength and the thermal conductivity of the prepared ceramics is 0.96g.cm-3,60.7%,5.3MPa and 0.212W·m-1·K-1, respectively.

Bamboo Waste-based Bio-composite Substance: An application for Low-cost Construction Materials

2020 ◽  
Vol 4 (1) ◽  
pp. 41-48
Author(s):  
Teodoro Astorga Amatosa ◽  
Michael E. Loretero
Keyword(s):  
Composite Materials ◽  
Sea Water ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Single Layer ◽  
High Strength ◽  
Green Technology ◽  
Experimental Medium ◽  
Natural Treatment

Bamboo is a lightweight and high-strength raw materials that encouraged researchers to investigate and explore, especially in the field of biocomposite and declared as one of the green-technology on the environment as fully accountable as eco-products. This research was to assess the technical feasibility of making single-layer experimental Medium-Density Particleboard panels from the bamboo waste of a three-year-old (Dendrocalamus asper). Waste materials were performed to produce composite materials using epoxy resin (C21H25C105) from a natural treatment by soaking with an average of pH 7.6 level of sea-water. Three different types of MDP produced, i.e., bamboo waste strip MDP (SMDP), bamboo waste chips MDP (CMDP) and bamboo waste mixed strip-chips MDP (MMDP) by following the same process. The experimental panels tested for their physical-mechanical properties according to the procedures defined by ASTM D1037-12. Conclusively, even the present study shows properties of MDP with higher and comparable to other composite materials; further research must be given better attention as potential substitute to be used as hardwood materials, especially in the production, design, and construction usage.

scholarly journals Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2910
Author(s):  
Chaoyi Ding ◽  
Chun Liu ◽  
Ligang Zhang ◽  
Di Wu ◽  
Libin Liu
Keyword(s):  
Diffusion Couple ◽  
Titanium Alloys ◽  
High Throughput ◽  
Volume Fraction ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
High Yield ◽  
Α Phase ◽  
Cr System

The high cost of development and raw materials have been obstacles to the widespread use of titanium alloys. In the present study, the high-throughput experimental method of diffusion couple combined with CALPHAD calculation was used to design and prepare the low-cost and high-strength Ti-Al-Cr system titanium alloy. The results showed that ultra-fine α phase was obtained in Ti-6Al-10.9Cr alloy designed through the pseudo-spinodal mechanism, and it has a high yield strength of 1437 ± 7 MPa. Furthermore, application of the 3D strength model of Ti-6Al-xCr alloy showed that the strength of the alloy depended on the volume fraction and thickness of the α phase. The large number of α/β interfaces produced by ultra-fine α phase greatly improved the strength of the alloy but limited its ductility. Thus, we have demonstrated that the pseudo-spinodal mechanism combined with high-throughput diffusion couple technology and CALPHAD was an efficient method to design low-cost and high-strength titanium alloys.

Study of structures of tillage working bodies with overhead chisel

2021 ◽  
pp. 10-15
Author(s):  
A. A. Kazubov ◽  
D. A. Mironov
Keyword(s):  
Wear Resistance ◽  
Energy Intensity ◽  
Raw Materials ◽  
High Strength ◽  
Its Regions ◽  
Land Cultivation ◽  
Strength Material ◽  
Working Bodies ◽  
Important Branch

Agriculture is the most important branch of the national economy, providing the population of our country with food and obtaining raw materials for a number of industries. The role of agriculture in the economy of Russia and its regions shows the structure and level of development of the state. It is impossible to get a good harvest without proper cultivation of the land. Cultivation of any crops begins with basic tillage, which is one of the most time-consuming operations. For this purpose, mounted and semi-mounted ploughshares are used. One of the effective ways to reduce the energy intensity of the main tillage process is chisel-shaped ploughshares with a protruding toe (chisel), which is located below the blade by 20 … 25 mm. Due to this, the sinking capacity of the hull and its resource are improved. To achieve this goal, such methods are used as the influx of metal in the field-cut zone, which increases its thickness, the surfacing of the nose part, which increases wear resistance and, accordingly, reduces wear of the sock in thickness, welding to the sock with a plate made of a more high-strength material [1].

Preparation and characterization of low-cost high-performance mullite-quartz ceramic proppants for coal bed methane wells

2018 ◽  
Vol 25 (5) ◽  
pp. 957-961 ◽  
Author(s):  
Kaiyue Wang ◽  
Huijun Wang ◽  
Yi Zhou ◽  
Guomin Li ◽  
Yaqiao Wu ◽  
...  
Keyword(s):  
High Performance ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Low Cost ◽  
Quartz Ceramic ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Sintering Process ◽  
Flow Mechanism

AbstractIn this study, the mullite-quartz-based proppants were successfully prepared by using the coal gangue as the raw materials. Then, the effects of the additive and the sintering temperature on the composition, microstructure, and properties of the proppants were investigated. Results showed that the proppants sintered at 1250°C with the 10 wt% bauxite additive presented the best performance, which was very close to that of the quartz-proppant, and met the operational requirements of the 52 MPa coal bed methane wells. The viscous flow mechanism of the liquid phase formed during the sintering process also promoted the arrangement of the grains, thus benefiting the densification and the strength of the proppants.

Low-cost biodiesel production using waste oil and catalyst

2020 ◽  
pp. 0734242X2093517
Author(s):  
Raheleh Talavari ◽  
Shokoufe Hosseini ◽  
GR Moradi
Keyword(s):  
Electron Microscopy ◽  
Fossil Fuels ◽  
Building Materials ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Waste Frying Oil ◽  
X Ray

With the production of renewable biofuels, concerns about the end of fossil fuels have been partially eliminated. On the other hand, the utilization of low-cost and waste materials to provide the raw essential substances to manufacture these fuels is of paramount importance. Biodiesel is one of these fuels and the required raw materials for the reaction are oil (triglycerides), alcohol and catalyst. In this work, travertine stone powder (as waste in the manufacture of building materials) was used as a catalyst and waste frying oil as a source of triglyceride for biodiesel production. Using thermogravimetric and X-ray diffraction analysis, optimum temperature for catalyst calcination was selected at 900°C. Furthermore, X-ray fluorescence, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, transmission electron microscopy and scanning electron microscopy analyses were performed. Using the design of experiments Response Surface Methodology, the optimum reaction conditions for biodiesel production yield of 97.74% were: reaction temperature 59.52°C (~60°C), time 3.8 h (228 min), catalyst concentration 1.36 wt.% and the methanol to oil molar ratio of 11:6. After reusing four times, the catalyst efficiency was reduced a little, and the biodiesel yield was 89.84%, indicating high strength and stability of the catalyst.

Influence of Reactive Organic Flame Retardants on Properties of Resol Phenoplast Foams

2014 ◽  
Vol 1025-1026 ◽  
pp. 451-454
Author(s):  
Mihail Gerasimovich Bruyako ◽  
Larisa Grigorieva ◽  
Evgeniya Viktorovna Sokoreva
Keyword(s):  
Production Process ◽  
Economic Performance ◽  
Heat Conductivity ◽  
Flame Retardants ◽  
Heat Insulation ◽  
Organophosphorus Compounds ◽  
Raw Materials ◽  
Low Cost ◽  
Insulating Materials ◽  
Foam Plastics

Found that Organophosphorus Compounds Reduce the Flammability of Resol Phenoplast Foams. Quality Improves Thermal Insulation Materials, the Use of such Phenolicfoam. Analysis of Using the Heat-Insulating Materialsindicates that Heat Insulation Made with Filling Phenol Foam Plastics Havinglow Heat-Conductivity and Relatively Low Cost of Raw Materials is Superior Bytheir Technical and Economic Performance to Mineral and other Polymericheat-Insulating Materials. Meanwhile, Relatively Low Strength and Smolderingpropensity of Resole Foam Phenol Plastics, as well as Excessive Fumes Duringthe Production Process of Heat-Insulating Materials on their Base, Containwider Usage of Phenol Foam Plastics in Building.

scholarly journals Transforming natural resources into industrial advantage: the case of China’s rare earths industry

2017 ◽  
Vol 37 (3) ◽  
pp. 504-526 ◽  
Author(s):  
CARLOS AGUIAR DE MEDEIROS ◽  
NICHOLAS M. TREBAT
Keyword(s):  
Rare Earth ◽  
Natural Resources ◽  
Division Of Labor ◽  
Rare Earths ◽  
Raw Materials ◽  
Low Cost ◽  
Value Added ◽  
International Division ◽  
State Technological

ABSTRACT This paper analyzes the development of China’s rare earths industry, emphasizing the role of state technological initiatives in the country’s transition from rare earth exporter to large industrial consumer of these raw materials. Like other industrial powers before it, China takes advantage of low-cost domestic supplies of strategic raw materials to promote higher value-added manufacturing. We argue that, in the case of rare earths, this strategy has been largely successful, disrupting a classic international division of labor that existed prior to 2000, in which China exported most of its rare earth output to wealthy countries, and transforming Chinese firms into exporters of more sophisticated downstream products.

Preparate and Properties on Rare Earth PVA Complex Nanofibers

2014 ◽  
Vol 894 ◽  
pp. 332-335
Author(s):  
Di Zhang ◽  
Qing Shan Li ◽  
Li Jiao Zhao
Keyword(s):  
Composite Nanofibers ◽  
Single Phase ◽  
Raw Materials ◽  
Low Cost ◽  
Impact Resistance ◽  
Synthesis Method ◽  
Research Field ◽  
Uniform Size ◽  
Research Directions ◽  
Potential Applications

Nanofiber is an important part in nanomaterials research field, and the polymer nanofibers is one of the important research directions. RE, which has unique electronic structure, the optical, electrical and magnetic aspects of the special nature, combine with the polymer, that has rich raw materials, simple synthesis method, easy processing, high impact resistance, light weight and low cost advantages, to get a new kind materials of practical uses and potential applications. This topic was prepared PVA/Sm (NO3)3composite nanofibers using an electrostatic spinning, and the PVA/Sm (NO3)3nanofibers were treated at an appropriate temperature to obtain Sm2O3nanofibers. Samples were characterized and analyzed by the SEM, FTIR, XRD, TG-DTA and other modern means. The results show that the surface of PVA/Sm (NO3)3composite fibers is smooth, uniform size and amorphous. Sm (NO3)3is not interact with the PVA groups, and the diameter of fiber is 200nm. After firing, the diameter of fibers was reduced to 100nm. PVA, Sm (NO3)3and the water are completely decomposed at 600°C or more, finally obtained Sm2O3 nanofibers of single-phase crystalline state.

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