scholarly journals The possibility of the boronizing process on the pressed samples of iron powder

2009 ◽  
Vol 63 (3) ◽  
pp. 253-258
Author(s):  
Emina Pozega ◽  
Svetlana Ivanov ◽  
Vesna Conic ◽  
Branislav Cadjenovic
Keyword(s):  
Experimental Investigation ◽  
Thermal Treatment ◽  
Iron Powder ◽  
Ammonium Chloride ◽  
Treatment Process ◽  
Polynomial Function ◽  
Potassium Fluoride ◽  
Volume Changes ◽  
Fourth Degree ◽  
Powder Samples

The paper presents results of the experimental investigation of the boronizing process on nonsintering iron powder samples (NC100.24, H?gan?s, Sweden). Experiments are planned within the limits of applicability of simultaneous sintering at chemical-thermal treatment process (boronizing). The simlex plan of 15 experimental points was used for the experiment, while a polynomial function of fourth degree was employed in the modeling of a mixture composition based on the volume changes, porosity and the depth layer changes. Boronizing was carried out in mixture with born carbide by addition of ammonium bifluoride, ammonium chloride and boron potassium fluoride as activators, by proportion definited plan.

scholarly journals Influence of activators on constitutes of diffusion layer at boronizing pressed samples from iron powder

2008 ◽  
Vol 62 (3) ◽  
pp. 164-169 ◽  
Author(s):  
Emina Pozega ◽  
Svetlana Ivanov
Keyword(s):  
Experimental Investigation ◽  
Chemical Composition ◽  
Iron Powder ◽  
Ammonium Chloride ◽  
Diffusion Layer ◽  
Potassium Fluoride ◽  
Mixture Composition ◽  
Ammonium Bifluoride ◽  
Mathematical Processing ◽  
Quantitative Changes

In this paper, results of experimental investigation which contributes to study of quantitative changes of porosity during chemical-thermical process, apropos boronizing of pressed samples from iron powder, with variation of boronizing mixture composition are presented. The basic mixture is modified by the addition of activators with different chemical composition and in different percentage rate (0-4 wt%). Mixtures with ammonium chloride, ammonium bifluoride and boron potassium fluoride were investigated. According to the results of the experiments it is found that the content of activators has an influence on the porosity of pressed samples from iron powder. In order to obtain better boride layers it was necessary to choose a mixture for boronizing and to determine the most useful activators and their ratio. The results of research and mathematical processing enable the choice of optimal mixture composition for boroning. .

scholarly journals Influence of the composition of the boroning mixture on the dimension change of pressed and boroned samples from iron powder

2008 ◽  
Vol 40 (2) ◽  
pp. 197-205
Author(s):  
S. Ivanov ◽  
E. Pozega
Keyword(s):  
Mathematical Modelling ◽  
Iron Powder ◽  
Metal Powder ◽  
Volume Change ◽  
Potassium Fluoride ◽  
Chemical Compositions ◽  
Thermal Treatments ◽  
Volume Changes ◽  
Dimension Change ◽  
Powder Samples

Volume changes occur during sintering and chemical-thermal treatments of metal powder samples. The results of the investigation of the volume change of pressed and boroned samples from an iron powder, depending on the mixture composition used for the boroning process, are presented in this paper. The basic mixture, used for boroning of the investigated samples from iron powder, is modified by the addition of activators with different chemical compositions and in different concentrations, of up to 4 wt %. Mixtures with ammonium bifluoride, ammonium chloride and boron potassium fluoride were investigated. The research results and the mathematical modelling enable the choice of mixture compositions for boroning based on the volume change given in advance.

scholarly journals The influence of density of pressed iron powder samples on the quality of boride layers

2003 ◽  
Vol 35 (2) ◽  
pp. 93-98 ◽  
Author(s):  
S. Ivanov ◽  
B. Stanojevic
Keyword(s):  
Thermal Treatment ◽  
Boron Carbide ◽  
Iron Powder ◽  
Solid Mixture ◽  
Powder Samples ◽  
Sintered Materials

In this work the influence of the density of pressed iron powder on the quality of boride layers has been analysed. Examinations were performed on pressed samples of iron powder. The used granulation was 50-100, 100-150 and 150-200 mm. The samples were pressed under pressure of 200, 400, 600, 800 and 1000 MPa. Boroning was performed in a solid mixture based on boron-carbide, and was in principle the same for all samples. The obtained boride layers varied in depth and quality (porosity, the contact with metal). It has been observed that simultaneously with boroning sintering also occurred, and this fact offers a wide application possibility in the chemical-thermal treatment for sintered materials.

scholarly journals Using Thermal Treatment Process to Enhance Anodic Oxidation TiO2 Nanotubes with High Degradation Effect of Methylene Blue

2018 ◽  
pp. 655 ◽  
Author(s):  
Wei Chien ◽  
Chi-Yu Lin ◽  
Shang-Te Tsai ◽  
Cheng-Fu Yang ◽  
Chiu-Chen Chang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Thermal Treatment ◽  
Anodic Oxidation ◽  
Tio2 Nanotubes ◽  
Treatment Process ◽  
Degradation Effect

Facile synthesis of ultrathin and perpendicular NiMn2O4 nanosheets on reduced graphene oxide as advanced electrodes for supercapacitors

2018 ◽  
Vol 5 (7) ◽  
pp. 1714-1720 ◽  
Author(s):  
Long Li ◽  
Hongli Hu ◽  
Shujiang Ding
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Thermal Treatment ◽  
Reduced Graphene Oxide ◽  
Treatment Process ◽  
Facile Synthesis ◽  
Storage Performance ◽  
Reduced Graphene ◽  
Co Precipitation ◽  
Electrodes For Supercapacitors

A NiMn2O4 NSs@rGO nanocomposite was successfully fabricated through a facile co-precipitation and thermal treatment process, which exhibits enhanced energy storage performance.

Electrospray and Thermal Treatment Process for Enhancing Surface Roughness of Fecralloy Coating Layer on a Large Sized Substrate

2017 ◽  
Vol 24 (1) ◽  
pp. 46-52
Author(s):  
Hye Moon Lee ◽  
Hye Young Koo ◽  
Sangsun Yang ◽  
Dahee Park ◽  
Sooho Jung ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Thermal Treatment ◽  
Treatment Process ◽  
Coating Layer

scholarly journals Study on Properties of Waste Concrete Powder by Thermal Treatment and Application in Mortar

2020 ◽  
Vol 10 (3) ◽  
pp. 998 ◽  
Author(s):  
Yuwu Sui ◽  
Chuping Ou ◽  
Shu Liu ◽  
Jinshuai Zhang ◽  
Qingbo Tian
Keyword(s):  
Particle Size ◽  
Thermal Treatment ◽  
Treatment Process ◽  
Activity Index ◽  
Recycled Aggregate ◽  
Thermal Treatments ◽  
High Quality ◽  
Active Elements ◽  
Waste Concrete ◽  
Mechanical Strengths

Waste concrete must be crushed, screened, and ground in order to produce high-quality recycled aggregate. In this treatment process, 15–30% waste concrete powder (<0.125 mm) can be generated. Hydration activity and the reuse of waste concrete powders (WCPs) were studied in this work, and the results illustrated that the particle size changed after a series of thermal treatments at temperatures from 400 ℃ to 800 ℃. The particle size of waste concrete powder decreased by 700 ℃ thermal treatment, and by 600 ℃ thermal treatment, it increased. More active elements appeared in WCP heated by 800 ℃. Nevertheless, the activity index (AI) of WCP, measured by the ratio of mechanical strengths between mortar with a 30% replacement of the cement with WCP and normal mortar without WCP, indicated that the WCP by 700 ℃ thermal treatment had an optimal AI value, which meant WCP treated at 700 ℃ could be used in mortar or concrete as an admixture.

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