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Selb, Germany

Knappe S.,NETZSCH Geratebau GmbH
16th European Conference on Composite Materials, ECCM 2014 | Year: 2014

The measurement results presented clearly demonstrate the high capabilities of the selected thermoanalytical and thermophysical techniques for comprehensive thermal characterization of different carbon fiber-reinforced plastics (CFRPs). By means of Differential Scanning Calorimetry (DSC) and Dielectric Analysis (DEA), the curing behavior of thermosetting resins can be investigated. DMA (Dynamic-Mechanical Analysis) is ideal for the determination of the glass transition temperature Tg and the stiffness and damping behavior of the composite. With Laser or Light Flash Analysis (LFA), the thermal conductivity can be determined according to the fiber orientation, which rounds out a comprehensive thermal characterization program for fiber-reinforced plastics. Source

Rambaldi E.,Centra Ceramico | Lindemann A.,NETZSCH Geratebau GmbH
CFI Ceramic Forum International | Year: 2012

In this work thermal conductivity of traditional ceramic materials with different porosity is investigated in order to assess the contribution of the microstructure. The aim is to correlate microstructural and physical characteristics of ceramic tiles with their thermal conductivity. A porcelain stoneware mix has been selected as reference material. The contribution of the open and closed pores to thermal conductivity is investigated by using different percentages of two polymethylmethacrylate (PMMA) powders, as pore-forming agents, and by varying the firing cycle. The evaluation of the experimentally measured values evidences the influence of microstructure and porosity of the materials on the thermal conductivity and diffusivity. Source

Fuglein E.,NETZSCH Geratebau GmbH | Walter D.,Justus Liebig University
Journal of Thermal Analysis and Calorimetry | Year: 2012

Lanthanum oxide (La 2O 3) is of great interest as catalyst material. When La 2O 3 particles are prepared from lanthanum hydroxide (La(OH) 3) by thermal processes under air, various oxycarbonate phases are formed which are resistant to thermal hydroxylation. This phenomenon has not yet been extensively investigated, even though oxycarbonate phases at the particle surfaces cause a change in lanthanum oxide's catalytic activity. The carbonate phases formed cannot be detected by means of XRD or REM-EDX investigations due to their detection limits. Thermal analysis, particularly TG-FT-IR, allows not only for the detection of the carbonate phases in La(OH) 3, but also for the tracking of the entire dehydration process from La(OH) 3 via LaOOH to La 2O 3 as well as the correct interpretation of mass changes during the thermal transformations. Pursuant to the investigations here carried out, it was determined that carbonate-free lanthanum hydroxide compounds can only be prepared and stored in a CO 2-free protective gas atmosphere (e.g., argon). © 2012 Akadémiai Kiadó, Budapest, Hungary. Source

Montalvo J.,U.S. Department of Agriculture | Von Hoven T.,U.S. Department of Agriculture | Cheuk S.,U.S. Department of Agriculture | Schindler A.,NETZSCH Geratebau GmbH
Textile Research Journal | Year: 2010

The standard test methods for moisture in lint cotton are based on oven drying at 105-110°C. All of the loss in weight is attributable to moisture. The U.S. cotton industry questions the reliability of the oven-drying method due to the concern that non-aqueous volatiles released during drying may be of an amount sufficient to bias the results. Our approach in these initial studies was to conduct a series of probing experiments to help understand the nature of the nonaqueous volatiles. Cottons were assayed for moisture content by standard oven drying and Karl Fischer Titration. The titration results were significantly lower. We oven-dried cottons of varying mass, changed the gaseous atmosphere during heating from air to nitrogen and attempted to "fingerprint" the non-aqueous volatiles by thermogravimetric analysis and thermogravimetric analysis-quadrupole mass spectrometry. The results demonstrate that complicated side reactions occur during oven-drying. However, no specific volatile organics were detected at standard ovendrying conditions. © The Author(s), 2010. Source

Knappe S.,NETZSCH Geratebau GmbH
ECCM 2012 - Composites at Venice, Proceedings of the 15th European Conference on Composite Materials | Year: 2012

The high performance of the modular designed Dielectric Analyzer DEA 288 Epsilon provides reliable data for in-situ cure monitoring. Practice-related application examples for RTM (Resin Transfer Molding) and SMC (Sheet Molding Compound) molding processes are demonstrated. Source

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