scholarly journals PROCESSING OF DUROPLASTICS

2005 ◽  
Vol 11 (2) ◽  
pp. 115-122
Author(s):  
Friedhelm Pracht
Keyword(s):  
High Temperatures ◽  
High Stability ◽  
Performance Ratio ◽  
Process Technology ◽  
Cost Performance ◽  
Building Technology ◽  
Main Emphasis ◽  
The Cost

Duroplastics are used in the building technology, as well as in other important technical components. If high stability of the form is demanded in connection with high temperatures, there are still possible fields of application for duroplastics particularly if the main emphasis is on the cost‐performance ratio, compared with thermoplastics which are becoming more and more important today. This article is about duroplastics and their process technology. Some examples of the use of duroplastics are: installation material such as switches and sockets, ashtrays for automobiles and in sanitation: toilet covers.

scholarly journals Roughing Milling with Ceramic Tools in Comparison with Sintered Carbide on Nickel-Based Alloys

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 734
Author(s):  
Pablo Fernández-Lucio ◽  
Octavio Pereira Neto ◽  
Gaizka Gómez-Escudero ◽  
Francisco Javier Amigo Fuertes ◽  
Asier Fernández Valdivielso ◽  
...  
Keyword(s):  
Cutting Speed ◽  
High Volume ◽  
Cemented Carbide ◽  
Performance Ratio ◽  
Cost Performance ◽  
Ceramic Tools ◽  
The Cost ◽  
Engine Components ◽  
Coated Carbide ◽  
Milling Tools

Productivity in the manufacture of aircrafts components, especially engine components, must increase along with more sustainable conditions. Regarding machining, a solution is proposed to increase the cutting speed, but engines are made with very difficult-to-cut alloys. In this work, a comparison between two cutting tool materials, namely (a) cemented carbide and (b) SiAlON ceramics, for milling rough operations in Inconel® 718 in aged condition was carried out. Furthermore, both the influence of coatings in cemented carbide milling tools and the cutting speed in the ceramic tools were analysed. All tools were tested until the end of their useful life. The cost performance ratio was used to compare the productivity of the tested tools. Despite the results showing higher durability of the coated carbide tool, the ceramic tools presented a better behavior in terms of productivity at higher speed. Therefore, ceramic tools should be used for higher productivity demands, while coated carbide tools for low speed-high volume material removal.

Aspects of Improving the Cost-Performance Ratio for the Manufacturing of Small-Size Cast Parts

2010 ◽  
Vol 43 (17) ◽  
pp. 349-354
Author(s):  
Cristian Deac ◽  
Melania Tera ◽  
Cristina Biris ◽  
Marius Bibu ◽  
Valentin Oleksik
Keyword(s):  
Performance Ratio ◽  
Cost Performance ◽  
The Cost ◽  
Cast Parts

scholarly journals Key Parameters in the Manufacture of SiC-Based Composite Materials by Reactive Melt Infiltration

2019 ◽  
Author(s):  
Mario Caccia ◽  
Javier Narciso
Keyword(s):  
Composite Materials ◽  
Dwell Time ◽  
Performance Ratio ◽  
Cost Performance ◽  
Vacuum Atmosphere ◽  
Protection Systems ◽  
Melt Infiltration ◽  
The Cost ◽  
Reactive Melt Infiltration ◽  
Reactive Melt

The manufacture of SiC-based composites is quite widespread, and currently different methods are employed for to produce them. The most efficient method, taking into account the cost/performance ratio, is reactive melt infiltration. It consists in infiltrating liquid silicon into a porous preform that must contain carbon, so that SiC is produced during infiltration. This chemical reaction is, in fact, the driving force of the process. In the present work, the synthesis of two SiC-based composite materials with very different applications and microstructures has been studied and optimized. In both cases, materials have been obtained with suitable properties for the selected applications. One of the materials studied is SiCp/Si for protection systems such as armor jackets, and the other one is Cf/SiC for use in braking systems. For the optimization, the dwell time and the atmosphere (Ar or primary vacuum) were used as variables. It has been found that in both preforms the optimum conditions are 1 hour dwell time and a vacuum atmosphere at 1450 °C. The effect of these parameters on microstructure and infiltration kinetics are discussed.

scholarly journals Assessment of the Usefulness of Observation and Tracking Heads of the Long-Range for the Stratospheric Aerostat Recognition System

2018 ◽  
Vol 9 (4) ◽  
pp. 163-176
Author(s):  
Paweł DOBRZYŃSKI ◽  
Mariusz KRAWCZAK ◽  
Stanisław LIPSKI ◽  
Bogdan MACHOWSKI
Keyword(s):  
Long Range ◽  
Armed Forces ◽  
Recognition System ◽  
Performance Ratio ◽  
Cost Performance ◽  
Technical Parameters ◽  
Intelligence Collection ◽  
Operational Capabilities ◽  
The Cost ◽  
Production And Operation

The paper presents the problems of applications of stratospheric systems to increase the tactical and reconnaissance capabilities of the Polish Armed Forces. The paper contains the results from examples of simulations which were designed to determine the cost/performance ratio of the production and operation of aerostats with strictly identified technical parameters in the context of their operational capabilities. It also describes the principles of operation of aerostats for the support of intelligence collection and the limitations imposed on aerostats by the specificity of tropospheric and stratospheric regions.

Development of a New 300kv Ultra-High-Resolution/High Performance Analytical TEM (H-9000)

1985 ◽  
Vol 43 ◽  
pp. 142-143
Author(s):  
H. Fujita ◽  
K. Ura ◽  
H. Sata ◽  
K. Miyauchi ◽  
T. Onai ◽  
...  
Keyword(s):  
High Resolution ◽  
Full Advantage ◽  
Diffraction Pattern ◽  
High Voltage ◽  
High Performance ◽  
Performance Ratio ◽  
General View ◽  
Lens System ◽  
Cost Performance ◽  
The Cost

Higher voltage is advantageous for better imaging resolution, better EELS performance and easier microscopy. Generally it results in a large scaled instrument with many associated problems. In the analytical area, there is a possibility of optimum voltage when a total performance balance is taken in consideration. We have developed a 300 KV TEM for both ultra high resolution and high performance analytical applications in view of these parameters. We have suceeded in making the instrument as compact as possible in order that it may improve the cost/performance ratio. We have taken full advantage of our ultra high voltage microscope experiences.Fig. 1 is a general view of the instrument. It is only 2.68m high and the same as conventional 200KV instruments. It consists of a 3-stage illumination and a 5-stage imaging lens system. This design allows the orientation matching for the diffraction pattern and TEM image throughout the entire magnification range.

Basic Study on Pre-Processing by the Shock Wave for Freeze-Drying

2008 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Ayumi Takemoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Food Processing ◽  
Food Industry ◽  
Freeze Drying ◽  
Performance Ratio ◽  
Experimental Result ◽  
Wave Loading ◽  
Basic Study ◽  
Cost Performance ◽  
The Cost

In the food industry, it is hoping high value-aided product and the increase in efficiency of food processing. On the other hand, we get an experimental result that the load of the shock wave improves an extraction of food, and soften food. We tried to examine the effectivity of the shock wave as pre-processing for freeze-drying from the result in permeation character seen in the radish and so on. In the case of freeze-drying, the object tends to be limited to the small or thin one with size, from the sublimability in processing, the performance in case of the restoration and the viewpoint of the cost performance ratio. We report the result that shock wave loading was done to various food as pre-processing of freeze-drying.

Comparison of the Cost Performance between Pure Cashmere Siro-Spun Yarn and Pure Rabbit Hair Ring-Spun Yarn

2011 ◽  
Vol 331 ◽  
pp. 40-43
Author(s):  
Yue Ling Liu ◽  
Bu Kun Sun
Keyword(s):  
Market Price ◽  
Scientific Basis ◽  
Raw Material ◽  
Performance Ratio ◽  
Cost Performance ◽  
Spun Yarn ◽  
Yarn Properties ◽  
Ring Spun Yarn ◽  
Yarn Hairiness ◽  
The Cost

This paper systematically analysied and measured the main properties of the pure cashmere siro-spun yarn and pure rabbit hair ring-spun yarn, including the yarn evenness, thin and thick , neps, raw material nature, yarn strength, yarn hairiness, twist level, wearing resistance and etc. And the market price of yarn was also investigated. The model of the cost performance ratio was established to analyse the yarn properties scientifically. The results indicated that the pure rabbit hair yarn is better than the pure cashmere yarn. It provided the guidance suggestions and scientific basis for the manufacturers to improve the performance and reduce the cost price of the yarn.

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