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 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.

Combinatory Effect of Thermal Treatment and Blending on the Quality of Pomegranate Juices

2012 ◽  
Vol 6 (11) ◽  
pp. 3186-3199 ◽  
Author(s):  
Pedro Mena ◽  
Nuria Martí ◽  
Domingo Saura ◽  
Manuel Valero ◽  
Cristina García-Viguera
Keyword(s):  
Thermal Treatment

KOH-ETCH Related Defects on Processed Silicon Wafers

1992 ◽  
Vol 259 ◽  
Author(s):  
Laurent E. Kassel
Keyword(s):  
Thermal Treatment ◽  
Epitaxial Growth ◽  
Silicon Wafers ◽  
Processing Steps ◽  
Crystallographic Orientations

ABSTRACTKOH, an anisotropic etchant of monocrystalline Si, may cause roughness and defects whose shapes are related to crystallographic orientations. This paper studies the effect of processing steps on the formation of geometric etch defects. Implantation, thermal treatment, epitaxial growth or photoresist were not the source of such defects. In the scope of this study, only unwanted damage caused geometric etch defects. This makes the observation of the wafer after KOH etch a good indicator of the quality of previous steps.

scholarly journals Problems of Analyzing Microstructure Images in Assessing the Impact of Technological Parameters of Combined Strain Wave Hardening on the Quality of the Surface Layer

2019 ◽  
Author(s):  
Андрей Киричек ◽  
Andrey Kirichek ◽  
Дмитрий Соловьев ◽  
Dmitriy Solovyev ◽  
Александр Хандожко ◽  
...  
Keyword(s):  
Surface Layer ◽  
Thermal Treatment ◽  
Strain Wave ◽  
Technological Parameters ◽  
Steel Microstructure ◽  
Main Indicator ◽  
Metallographic Images ◽  
Surface Layer Quality ◽  
The Impact

The problems of analyzing metallographic images and the method of their solution using modern software for the analysis of metallographic images are described. There is given an analysis of microstructure images as the main indicator of the surface layer quality by the example of studying the research results of strain wave hardening combinations and chemical-thermal treatment, in particular the influence of previous strain wave hardening and subsequent thermal and chemical- thermal treatment on the alloy steel microstructure or previous thermal and chemical- thermal treatment and subsequent strain wave hardening. On the basis of the analysis the effectiveness of strain wave hardening and chemical and thermal treatment is established.

scholarly journals Thermal treatment of carbon fibre reinforced polymers (Part 1: Recycling)

2019 ◽  
Vol 37 (1_suppl) ◽  
pp. 73-82 ◽  
Author(s):  
Marco Limburg ◽  
Jan Stockschläder ◽  
Peter Quicker
Keyword(s):  
Thermal Treatment ◽  
Carbon Fibre ◽  
Polymer Matrix ◽  
Energy Recovery ◽  
State Of The Art ◽  
Reinforced Polymers ◽  
Carbon Fibre Reinforced Polymers ◽  
High Production ◽  
High Production Cost

The increasing use of carbon fibre reinforced polymers requires suitable disposing and recycling options, the latter being especially attractive due to the high production cost of the material. Reclaiming the fibres from their polymer matrix however is not without challenges. Pyrolysis leads to a decay of the polymer matrix but may also leave solid carbon residues on the fibre. These residues prevent fibre sizing and thereby reuse in new materials. In state of the art, these residues are removed via thermal treatment in oxygen containing atmospheres. This however may damage the fibre’s tensile strength. Within the scope of this work, carbon dioxide and water vapour were used to remove the carbon residues. This aims to eliminate or at least minimize fibre damage. Improved quality of reclaimed fibres can make fibre reuse more desirable by enabling the production of high-quality recycling products. Still, even under ideal recycling conditions the fibres will shorten with every new life-cycle due to production-based blending. Fibre disposal pathways will therefore always also be necessary. The problems of thermal fibre disintegration are summarized in the second part of this article (Part 2: Energy recovery).

Thermal treatment and modified atmosphere packaging delay chilling injury and preserve the quality of cactus stems (Opuntia ficus-indicaMill.) cv Atlixco

2019 ◽  
Vol 43 (3) ◽  
pp. e12773
Author(s):  
Lizette L. Rodríguez-Verástegui ◽  
Juliana Osorio-Córdoba ◽  
Fernando Díaz de León-Sánchez ◽  
Ana M. López-Ramos ◽  
Blanca R. Pérez-Salvador ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Chilling Injury ◽  
Modified Atmosphere Packaging ◽  
Modified Atmosphere

Sintering of Commercial B4C with Synthesized B4C Additions

2008 ◽  
Vol 591-593 ◽  
pp. 588-592
Author(s):  
Rosa Maria da Rocha ◽  
Jonas S. Gutierres ◽  
Francisco Cristóvão Lourenço de Melo
Keyword(s):  
Thermal Stability ◽  
Carbon Source ◽  
Carbon Black ◽  
Boron Carbide ◽  
Carbothermal Reduction ◽  
Pressureless Sintering ◽  
High Chemical ◽  
Powder Mixtures ◽  
B4c Powder ◽  
Sintered Materials

Boron Carbide is a ceramic material of technological application due to its extreme hardness and high chemical and thermal stability. The effect of synthesized boron carbide addition on pressureless sintering and hot-pressing of a commercial B4C was investigated. B4C synthesized by carbothermal reduction using carbon black as carbon source was mixtured in 10, 30 and 50 wt% to a commercial B4C. Powder mixtures were compacted into pellets and sintered by pressureless sintering at 2050 °C/30min Samples were compared to a pure commercial B4C and characterization results have not showed great differences. Relative densities of as-sintered materials exceed 93% of theoretical for all compositions and microhardness Hv of ∼ 32 GPa was obtained.

scholarly journals Application of NIR analysis to verify cocoa powder authenticity

2004 ◽  
Vol 22 (SI - Chem. Reactions in Foods V) ◽  
pp. S329-S332 ◽  
Author(s):  
A. Trilčová ◽  
J. Čopíková ◽  
M. A Coimbra ◽  
A. Barros ◽  
L. Egert ◽  
...  
Keyword(s):  
Analytical Methods ◽  
Reliable Control ◽  
Control Methods ◽  
Ir Spectrometry ◽  
Cocoa Powder ◽  
Powder Samples ◽  
Ft Ir ◽  
Quality Of Food

At the present time the use of reliable control methods to ensure the labeled quality of food is task for organizations that have to limit or eliminate the falsification. The presentation describes the results of common analytical methods, NIR spectrometry and FT-IR spectrometry applied to cocoa powder. The two spectrometric techniques are statistically processed that allows discrimination of authentic and fraudulent cocoa powder samples.

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