scholarly journals Comparison of Three Manufacturing Techniques for Sustainable Porous Clay Ceramics

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 167
Author(s):  
Fernanda Andreola ◽  
Isabella Lancellotti ◽  
Rachele Sergi ◽  
Valeria Cannillo ◽  
Luisa Barbieri
Keyword(s):  
Electrical Conductivity ◽  
Processing Time ◽  
Room Temperature ◽  
Raw Materials ◽  
Green Roofs ◽  
Powder Pressing ◽  
Manufacturing Techniques ◽  
Clay Ceramics ◽  
Positive Effect ◽  
Potential Use

This study proposes different manufacturing techniques (manual pelletization, powder pressing, and “shell scaffold”) to obtain lightweight clay ceramics containing recovery raw materials. The sintering in an electrical furnace (1000 °C, 1 h processing time) was conducted by traditional firing from room temperature, for pressed and shell-scaffold samples, while the flash heating (i.e., samples directly put at 1000 °C) was used only for the pellets. The porous materials (porosity 40–80%), functionalized with nutrients (K and P) in amounts to confer the fertilizer capability, gave suitable results in terms of pH (6.7–8.15) and electrical conductivity (0.29–1.33 mS/cm). Thus, such materials can be considered as feasible lightweight clay ceramics, with a positive effect on the soil. These findings permit us to hypothesize a potential use in green roofs or in agronomic applications.

The Potential of Electronic High Temperature Devices Based Upon Polymer Derived Ceramics

2005 ◽  
Author(s):  
Weixing Xu ◽  
Jayanta Kapat ◽  
Louis C. Chow ◽  
Linan An ◽  
Wenge Zhang
Keyword(s):  
Electrical Conductivity ◽  
High Temperature ◽  
Room Temperature ◽  
Polymer Derived Ceramics ◽  
Micro Parts ◽  
Varied Composition ◽  
Potential Use ◽  
Lithography Technique ◽  
High Temperature Gas ◽  
Good Agreement

In this paper, we describe the potential use of polymer-derived ceramics (PDCs) for micro-sensors for high-temperature gas turbine applications. PDCs have several unique properties such as ease of microfabrication, excellent mechanical, materials and thermal properties, and tunable electrical conductivity. The electrical conductivity of PDCs with varied composition is measured as a function of temperature from room temperature upon to 700°C. Our results reveal that with suitable doping, the electrical conductivity could be controlled from insulating to semiconducting. Next, we measure the cure depth of the precursors as a function of UV intensity and exposure time. A model is developed to predict the cure depth as a function of photoinitiator concentration and light intensity. Good agreement between theory and experimental data is obtained. Finally, a few typical micro parts are fabricated by lithography technique.

Annealing Effect on the Thermoelectric Properties of Hot Extruded Bi2(Te0.94Se0.06)3+0.07wt%I+0.03wt%CuBr+0.02wt%Te Compound

2006 ◽  
Vol 15-17 ◽  
pp. 404-409
Author(s):  
Wang Kee Min ◽  
Sung Doo Hwang ◽  
Chang Ho Lee ◽  
Young Do Park ◽  
Yang Do Kim ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Raw Materials ◽  
Extrusion Process ◽  
Annealing Process ◽  
Annealing Effect ◽  
Z Value

The n-type Bi2(Te0.94Se0.06)3 thermoelectric compound was prepared by the direct extrusion process using the powder as raw materials. Hot extruded specimens were annealed at 200°C and 350°C for 2hrs. The electrical conductivity, thermoelectric power and thermal conductivity of hot extruded and annealed specimens were measured at room temperature. The fractographs of the specimens showed that the grain size became coarser and a lot of porosities were generated during annealing process. The power factor value (PF) decreased with increasing the annealing temperature. The electric conductivity and thermal conductivity of the specimens also decreased with the increase of annealing temperature. This may be reasoned that the generated porosities affect the thermal conductivity of the specimens prepared in this study. The figure of merit (Z) value of the annealed specimens at 350°C was improved about 10%. The highest Z value of the specimens annealed at 350°C was 2.0 x 10-3/K among the prepared specimens.

Preparation and Thermoelectric Properties of (Ca1-x-yKxBiy)3Co4O9 Ceramic

2008 ◽  
Vol 368-372 ◽  
pp. 559-561 ◽  
Author(s):  
Hao Ming Hu ◽  
Yuan Deng ◽  
Jian Li ◽  
Guang Sheng Wang
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Room Temperature ◽  
Raw Materials ◽  
Sol Gel ◽  
Sintering Process ◽  
Conventional Sintering

The precursor of (Ca1-x-yKxBiy)3Co4O9 was synthesized by sol-gel method using nitrate salts as raw materials and citrate acid as agent. The final product was obtained after the precursor was calcined at 800°C for 4 h. The polycrystalline bulk samples were fabricated by a conventional sintering process at 900°C for 12 h. XRD and SEM were used to characterize the microstructures and the composition of the samples. The transport properties of the samples at room temperature were determined by measuring electrical conductivity and Seebeck coefficient. The Bi and K-doped samples show an excellent transport properties even at room temperature. The value of power factor of (Ca0.90K0.075Bi0.025)3Co4O9 reaches 1.42×10-4Wm-1K-2 at 293K, close to the performance of pure Ca3Co4O9 at 1000K.

Room-Temperature Electrical Conductivity Property of Si3N4/TiN Composite Ceramics

2010 ◽  
Vol 150-151 ◽  
pp. 257-261 ◽  
Author(s):  
Shu Hui Zhang ◽  
Zhi Qiang Kang ◽  
Qing Lu
Keyword(s):  
Electrical Conductivity ◽  
Electrical Discharge ◽  
Room Temperature ◽  
Electrical Discharge Machining ◽  
Raw Materials ◽  
Electric Resistivity ◽  
Composite Ceramics ◽  
Titanium Slag ◽  
Conductivity Property ◽  
Iron Ore Tailing

Room-temperature electrical conductivity property of Si3N4/TiN composite ceramics fabricated by Si3N4 powders from iron ore tailing and high titanium slag was investigated. Si3N4/TiN composite ceramics were machined by electrical discharge machining. The results show that the minimum amount of TiO2 in initial raw materials is about 20wt% for the formation of electroconductive network in the composites, of which the electric resistivity is 4.25×10-2•cm. The electric resistivity decreases slightly with increasing the sintering temperature. Surface roughness enhances significantly with the speed of the electrical discharge machining rising.

scholarly journals PENGARUH KUALITAS BAHAN BAKU DAN PROSES PRODUKSI TERHADAP KUALITAS PRODUK PT. MENJANGAN SAKTI

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Diovita Hilary ◽  
Imam Wibowo
Keyword(s):  
Production Process ◽  
Product Quality ◽  
Room Temperature ◽  
Raw Materials ◽  
Raw Material ◽  
Improve Product Quality ◽  
Improve Product ◽  
Analysis Technique ◽  
Positive Effect

<em>This study aims to analyze the effect of the quality of raw materials on product quality at PT. Menjangan Sakti, the influence of the production process on product quality at PT. Menjangan Sakti and the quality of raw materials and production processes simultaneously on product quality at PT. Menjangan Sakti. The number of samples in this study were 88 respondents. The analysis technique uses simple regression analysis and multiple regression. The results showed that the quality of raw materials and the production process simultaneously had a significant effect on product quality, because the quality of raw materials was maintained in terms of room temperature according to the type of raw materials stored and the production process where workers worked according to applicable regulations. The quality of raw materials has a positive effect on product quality. This shows that the quality of raw materials that are maintained in terms of room temperature according to the type of raw material stored can improve product quality. The production process has a positive effect on product quality. This shows that the workforce working according to the applicable regulations can significantly improve product quality.</em>

scholarly journals Synthesis of high quality 2D carbide MXene flakes using a highly purified MAX precursor for ink applications

2021 ◽  
Author(s):  
Shi-Hyun Seok ◽  
Seungjun Choo ◽  
Jinsung Kwak ◽  
Hyejin Ju ◽  
Ju-Hyoung Han ◽  
...  
Keyword(s):  
Raw Materials ◽  
High Quality ◽  
Max Phases ◽  
Painting Process ◽  
Manufacturing Techniques

A method of pelletizing raw materials was used to tackle unwarranted variations in MXene products depending on the parent MAX phases, manufacturing techniques, and preparation parameters, enabling a direct painting process on various surfaces for ink applications.

Preparation of High-Purity Ultrafine α-Al2O3 by Solid-State Reaction at Room Temperature

2008 ◽  
Vol 368-372 ◽  
pp. 683-685
Author(s):  
Cheng Wei Hao ◽  
Bo Lin Wu ◽  
Ji Yan Li
Keyword(s):  
Solid State ◽  
High Purity ◽  
Solid State Reaction ◽  
Room Temperature ◽  
Raw Materials ◽  
Phase Particle ◽  
Phase Transformation Temperature ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Α Al2o3

Ammonium aluminium carbonate hydroxide (AACH), with a small quantity of γ-AlOOH, was synthesized through solid-state reaction at room temperature using AlCl3·6H2O and NH4HCO3 as raw materials and polyethylene glycol (PEG-10000) as the dispersant. After calcined at 1100°C for 1.5h, α-Al2O3 powders with primary particle sizes of 20~30nm were obtained. The crystal phase, particle size and morphology of the high-purity ultrafine α-Al2O3 were characterized. The results showed that a small quantity of γ-AlOOH in the AACH decomposed and formed crystal seeds. The presence of crystal seeds reduced the nucleation activation energy and therefore reduced the phase transformation temperature.

Application of lean practices in small and medium-sized food enterprises

2013 ◽  
Vol 116 (1) ◽  
pp. 125-141 ◽  
Author(s):  
Manoj Dora ◽  
Dirk Van Goubergen ◽  
Maneesh Kumar ◽  
Adrienn Molnar ◽  
Xavier Gellynck
Keyword(s):  
Food Processing ◽  
Lean Manufacturing ◽  
Raw Materials ◽  
Current Status ◽  
Food Sector ◽  
Statistical Process ◽  
Content Type ◽  
Lean Practices ◽  
The Status ◽  
Manufacturing Techniques

Purpose – Recent literature emphasizes the application of lean manufacturing practices to food processing industries in order to improve operational efficiency and productivity. Only a very limited number of studies have focused on the implementation of lean manufacturing practices within small and medium-sized enterprises (SMEs) operating in the food sector. The majority of these studies used the case study method and concentrated on individual lean manufacturing techniques geared towards resolving efficiency issues. This paper aims to analyze the status of the lean manufacturing practices and their benefits and barriers among European food processing SMEs. Design/methodology/approach – A structured questionnaire was developed to collect data. A total of 35 SMEs' representatives, mostly CEOs and operations managers, participated in the survey. The study investigated the role of two control variables in lean implementation: size of the company and country of origin. Findings – The findings show that lean manufacturing practice deployment in food processing SMEs is generally low and still evolving. However, some lean manufacturing practices are more prevalent than others; e.g. flow, pull and statistical process control are not widely used by the food processing SMEs, whereas total productive maintenance, employee involvement, and customer association are more widespread. The key barriers encountered by food SMEs in the implementation of lean manufacturing practices result from the special characteristics of the food sector, such as highly perishable products, complicated processing, extremely variable raw materials, recipes and unpredictable demand. In addition, lack of knowledge and resources makes it difficult for food processing SMEs to embark on the lean journey. Originality/value – The gap in the literature regarding the application of lean manufacturing in the food sector is identified and addressed in this study. The originality of this paper lies in analyzing the current status of the use of lean manufacturing practices among food SMEs in Europe and identifying potential barriers.

Structure and Conductivity of Iodine-Doped C60 Thin Films

1994 ◽  
Vol 359 ◽  
Author(s):  
Jun Chen ◽  
Haiyan Zhang ◽  
Baoqiong Chen ◽  
Shaoqi Peng ◽  
Ning Ke ◽  
...  
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Room Temperature ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
X Ray ◽  
Thermally Activated ◽  
Order Of Magnitude

ABSTRACTWe report here the results of our study on the properties of iodine-doped C60 thin films by IR and optical absorption, X-ray diffraction, and electrical conductivity measurements. The results show that there is no apparent structural change in the iodine-doped samples at room temperature in comparison with that of the undoped films. However, in the electrical conductivity measurements, an increase of more that one order of magnitude in the room temperature conductivity has been observed in the iodine-doped samples. In addition, while the conductivity of the undoped films shows thermally activated temperature dependence, the conductivity of the iodine-doped films was found to be constant over a fairly wide temperature range (from 20°C to 70°C) exhibiting a metallic feature.

The Influence of Silicon Dopant and Processing on Thermoelectric Properties of B4C Ceramics

1998 ◽  
Vol 545 ◽  
Author(s):  
Ke-Feng Cai ◽  
Ce-Wen Nan ◽  
Xin-Min Min
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Figure Of Merit ◽  
Room Temperature ◽  
A Value ◽  
Si Doped

AbstractB4C ceramics doped with various content of Si (0 to 2.03 at%) are prepared via hot pressing. The composition and microstructure of the ceramics are characterized by means of XRD and EPMA. Their electrical conductivity and Seebeck coefficient of the samples are measured from room temperature up to 1500K. The electrical conductivity increases with temperature, and more rapidly after 1300K; the Seebeck coefficient of the ceramics also increases with temperature and rises to a value of about 320μVK−1. The value of the figure of merit of Si-doped B4C rises to about 4 × 10−4K−1 at 1500K.

Sign in / Sign up

Export Citation Format

Share Document