The Study of the Red Mud Foam Lightweight Insulation Materials

2013 ◽  
Vol 327 ◽  
pp. 36-39
Author(s):  
Long Ma ◽  
Guo Zhong Li
Keyword(s):  
Electron Microscopy ◽  
Material Properties ◽  
Red Mud ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Insulation Material ◽  
Mechanism Analysis ◽  
Sintering Process ◽  
Micro Structure ◽  
Scanning Electron

Red mud foam lightweight insulation material was prepared by using red mud, fly ash, coal gangue and so on as raw materials by the method of foaming and sintering process. Influences of sintering temperature on thermal insulation material properties were studied. The micro-structure of samples was characterized by scanning electron microscopy (SEM) and mechanism analysis was made. The results show that in this condition, the optimum sintering temperature is 1120°C. The flexural strength of the samples is 0.41MPa, the compressive strength is 1.15MPa and the density is 479kg/m3.

scholarly journals Capabilities and Limitations of Using Desktop 3-D Printers in the Laser Sintering Process

2020 ◽  
Vol 10 (18) ◽  
pp. 6184
Author(s):  
Michał Olejarczyk ◽  
Piotr Gruber ◽  
Grzegorz Ziółkowski
Keyword(s):  
Electron Microscopy ◽  
Computed Tomography ◽  
Material Properties ◽  
Raw Materials ◽  
Laser Sintering ◽  
Sintering Process ◽  
Scanning Calorimetry ◽  
Group A ◽  
End Use ◽  
Scanning Electron

Almost one-third of the revenues of the Additive Manufacturing (AM) machines market is generated by desktop systems. A new category of such devices are Laser Sintering (LS) machines, in which we can find a few representatives of this group. A growing interest in the use of desktop AM solutions in research and industry is visible, and therefore an evaluation of its capabilities and limitations is desirable. The presented paper focuses on comparing desktop (Sintratec S1; Sinterit Lisa) and industrial (Formiga P110) LS systems. The properties of raw materials were characterized by Scanning Electron Microscopy (SEM) and Differential Scanning Calorimetry (DSC), as well as by determining the Particle Size Distribution (PSD) and static and dynamic flowability of powder. Laser Sintering commercial sets were characterized by their mechanical properties (tensile strength), surface quality (roughness), as well as by their accuracy and porosity (computed tomography). The conducted test showed significant differences, especially in the case of material properties and manufacturing repeatability. The found differences between desktop and industrial LS systems suggest that the use of a low-budget LS system, especially for the research and production of end-use parts, has to take into account its limitations.

Influence of Foaming Agent on Properties of Red Mud Lightweight Baking-Free Brick

2014 ◽  
Vol 541-542 ◽  
pp. 388-391
Author(s):  
Long Ma ◽  
Guo Zhong Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Red Mud ◽  
Micro Structure ◽  
Foaming Agent ◽  
Scanning Electron

Red mud lightweight baking-free brick was prepared by red mud, fly ash and cement, mixed with a certain amount of activator agent and foaming agent. The influence of foaming agent on properties of red mud lightweight baking-free brick was studied. The micro-structure of red mud lightweight baking-free brick was characterized by scanning electron microscopy (SEM). The results show that when the foaming agent content is 10ml, the sample with better performance obtained and the density is 423kg/m3, flexural strength is 0.49MPa and compressive strength is 1.87MPa.

Preparation and Properties of CaF2 Nano-Powder

2016 ◽  
Vol 680 ◽  
pp. 257-260
Author(s):  
Meng Yun Dong ◽  
Cheng Zhang ◽  
Jin Feng Xia ◽  
Hong Qiang Nian ◽  
Dan Yu Jiang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Sintering Temperature ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nano Powder ◽  
Direct Precipitation ◽  
Scanning Electron

CaF2 nano-power was prepared by direct precipitation methods with Ca(NO3)2 and KF as raw materials. The influences of presintering temperature and sintering temperature on the particle size and distribution of CaF2 nano-power were studied by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). This study provided an experimental method for preparation of CaF2 nano-power. The results show that the best presintering temperature of CaF2 nano-power is 500°C and the best sintering temperature of CaF2 ceramic is 900°C.

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

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.

Preparation and Study on the Performance of Glazed Hollow Beads Thermal Insulation Materials

2013 ◽  
Vol 662 ◽  
pp. 335-338
Author(s):  
Xiao Long Li ◽  
Guo Zhong Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermal Insulation ◽  
Material Properties ◽  
Cementitious Materials ◽  
Insulation Material ◽  
Action Mechanism ◽  
Molding Process ◽  
Internal Morphology ◽  
Scanning Electron

The glazed hollow beads thermal insulation board was made of glazed hollow beads and perlite by selecting cement and fly ash as cementitious materials, and adding appropriate amount of VAE emulsion and fibers, in the compression molding process. In this paper, the influence of different dosages of perlite replacing vitrified beads, VAE emulsion and fiber on the material properties were studied. Besides, the internal morphology of the sample was observed by scanning electron microscopy, and the action mechanism of the insulation material was explored.

Densification Technique of Al2O3/Al Metal Ceramics Using Powder Metallurgy Method

2018 ◽  
Vol 281 ◽  
pp. 291-296
Author(s):  
Yin Yan Ju ◽  
Ai Xia Chen ◽  
Rui Hua Wang ◽  
Fang Wang ◽  
Ming Han Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Holding Time ◽  
Molding Pressure ◽  
Powder Metallurgy Method ◽  
Sintering Process ◽  
Good Oxidation Resistance ◽  
Corrosion Medium ◽  
Scanning Electron

In atmospheric environments, Al2O3 ceramics have good oxidation resistance in water, acid, and other solutions and suitable corrosion medium resistance. Al2O3 ceramics is one of the most widely used engineering ceramics. In this paper, Al2O3/Al cermet matrix composites were prepared by mixing a series of powders with aluminum and alumina powders as raw materials. The interface of Al2O3/Al cermet was observed by scanning electron microscopy. The densification process of Al2O3/Al cermet was then explored from the aspects of formulation, molding pressure, holding time, and sintering process. After mixing and dry pressing, 50 wt% Al and 50 wt% Al2O3 were appropriate for sintering. Following sintering and measuring density, density was improved under 20 MPa with a 20-minute holding time. Through a comparison of the sintering process, the interface structure was observed via scanning electron microscopy, which found that secondary sintering is conducive to improving the density of Al2O3/Al cermet.

Heat Preservation Time on the Properties of Red Mud Lightweight Insulation Brick

2014 ◽  
Vol 540 ◽  
pp. 225-228 ◽  
Author(s):  
Long Ma ◽  
Guo Zhong Li ◽  
Ji Rui Hu
Keyword(s):  
Electron Microscope ◽  
Fly Ash ◽  
Scanning Electron Microscope ◽  
Red Mud ◽  
Sintering Temperature ◽  
Raw Material ◽  
Sintering Process ◽  
Heat Preservation ◽  
Fluxing Agent ◽  
Scanning Electron

The red mud lightweight insulation brick was prepared by the sintering process as red mud, fly ash, bentonite as the main raw material, adding a certain amount of pore forming agent and fluxing agent. The sintering heat preservation time of red mud insulation brick on the properties was studied. The red mud lightweight insulation brick damage fracture microstructure was analyzed using scanning electron microscope (SEM) and the sintering mechanism was discussed preliminarily. The results show that with sintering temperature of 1100°C heating for 180 minutes, the performance of thermal insulation brick is better. When the heat preservation time extends to continue, the performances of sample remain stable basically.

scholarly journals THE MAIN CHARACTERISTICS OF POCERLAIN PRODUCTS BASED ON ANORTHITE CAS2

2018 ◽  
Vol 54 (5A) ◽  
pp. 208
Author(s):  
Nguyen Vu Uyen Nhi
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Heating Process ◽  
High Melting ◽  
Micro Structure ◽  
High Melting Temperature ◽  
Microscope Images ◽  
Scanning Electron

It is very difficult to synthesize pure CAS2 because of high melting temperature (1553 oC) In this paper, the formation of CAS2 during sintering period from the raw materials of kaolin, wollastonite, feldspar, sand and alumina at 1250 oC with holding time of 10 and 30 minutes is studied. The change during heating process was studied by the differential thermal analysis (DSC - TG). CAS2 minerals was analyzed by means of Rőntghen diffraction analysis (XRD) and phase idenfitication was performed by X'Pert High Score Plus software. The micro structure of the products has been studied through microscope images of scanning electron microscopy (SEM). The results showed that the water absorption of the products was less than 0.006 %, flexural strength reached 71-122 MPa, the Vicker’s hardness was in range from 2369 to 2666 MPa, the density was in range 2.36 – 2.59 g/cm3, the whiteness was in the range L* = 91.27 to 91.89 (according to CIELAB whiteness scale).

The Preparation of Red Mud Foam Lightweight Thermal Insulation Material

2014 ◽  
Vol 541-542 ◽  
pp. 104-107
Author(s):  
Long Ma ◽  
Guo Zhong Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Red Mud ◽  
Raw Materials ◽  
Insulation Material ◽  
Test Results ◽  
Sintering Process ◽  
Thermal Insulation Material ◽  
Properties Of Materials

Red mud foam lightweight thermal insulation material was prepared by red mud, fly ash, cement as main raw materials, adding a certain amount of adhesive, through ingredients, mixing, molding, foam, sintering process. The influence of the ratio of red mud and fly ash on the properties of materials was studied and the mechanism of influence was analyzed. The test results show that performances of the samples were best when the ratio of red mud and fly ash is 5:4 and its flexural strength is 0.44MPa, compressive strength is 1.23MPa, density is 481kg/m3.

Activator on Properties of Red Mud Lightweight Baking-Free Brick

2013 ◽  
Vol 468 ◽  
pp. 36-38
Author(s):  
Long Ma ◽  
Guo Zhong Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Red Mud ◽  
Micro Structure ◽  
Scanning Electron

Red mud lightweight baking-free brick was prepared by red mud, fly ash and cement. The influence of activator on properties of red mud lightweight baking-free brick was studied. The micro-structure of red mud lightweight baking-free brick was characterized by scanning electron microscopy (SEM). The results show that when the activator content is 1%, the sample with better performance obtained and the flexural strength increased by 64.4%, the compressive strength increased by 44.1% compared with the blank style.

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