Moderne Röntgenbeugung

Spieß, Lothar; Teichert, Gerd; Schwarzer, Robert; Behnken, Herfried; Genzel, Christoph

doi:10.1007/978-3-8348-8232-5

Cited by 40 publications

(33 citation statements)

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“…The relative intensities of reflections (110), (040), and (130) are different for the measurements before and after the heat–cool cycle. This can be explained by the flow‐induced orientations of the spherulites (see Section ) that originate from the FFF process . After the melting and controlled cooling step, the processing texture and morphology are largely deleted.…”

Section: Resultsmentioning

confidence: 99%

Polypropylene Filled With Glass Spheres in Extrusion‐Based Additive Manufacturing: Effect of Filler Size and Printing Chamber Temperature

Spoerk

Arbeiter

Raguž

et al. 2018

Macro Materials & Eng

108

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A challenge in extrusion‐based additive manufacturing of polypropylene (PP) filled with spherical particles is the combination of decent processability, excellent warpage control, and the retention of the tensile strength of neat PP. This study addresses this issue by adopting two approaches. Firstly, different size fractions of borosilicate glass spheres incorporated into PP are compared. Secondly, the temperature of the printing chamber (TCh) is varied. The effects of these features on the thermal, crystalline, morphological, tensile, impact, and warpage properties of 3D‐printed parts are examined. Smaller glass spheres (<12 µm) are found to be superior to larger fractions in all investigated aspects. Notably, the corresponding composites show higher tensile strengths than neat PP. An increase in TCh results in a more homogeneous temperature distribution within the printing chamber and promotes annealing during printing. Consequently, the dimensional accuracy of printed parts is improved. Additionally, β‐crystals and larger spherulites are formed at a higher TCh.

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Section: Resultsmentioning

confidence: 99%

Polypropylene Filled With Glass Spheres in Extrusion‐Based Additive Manufacturing: Effect of Filler Size and Printing Chamber Temperature

Spoerk

Arbeiter

Raguž

et al. 2018

Macro Materials & Eng

108

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“…A TC of one corresponds to no preference of the examined plane. When TC i { hkl } approaches k (number of examined crystallographic planes), it indicates a preference of the plane . Since only two crystallographic planes were examined in this study, the maximum value of TC equals two.…”

Section: Methodsmentioning

confidence: 96%

“…To determine the particle alignment in the compound, the texture grade ( TC ) was calculated according to eq. () for the (002) and (100) crystallographic planes of h‐BN:

T C_{i {h k l}} = \frac{\frac{I_{{h k l}}}{I_{{h k l}}^{0}}}{\frac{1}{k} \sum_{i = 1}^{k} \frac{I_{{h k l}}}{I_{{h k l}}^{0}}}

…”

Section: Methodsmentioning

confidence: 99%

Thermal, dielectric, and mechanical properties of h‐BN‐filled PTFE composites

Zimmermann-Ptacek

Muggli²,

Wildhack³

et al. 2018

J of Applied Polymer Sci

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In order to obtain materials for improved printed circuit boards (PCBs) with high thermal conductivity and low dielectric losses, hexagonal boron nitride (h-BN) was incorporated into a polytetrafluoroethylene (PTFE) matrix. The filler loading in the composite was varied up to a filler volume content of 50%. Thermal conductivity and coefficient of thermal expansion (CTE) were investigated with respect to filler orientation. Further dielectric and mechanical properties were investigated. The incorporation of h-BN improved the heat transport significantly, while the loss factor decreased. Fillers with a higher aspect ratio have a greater effect on increasing thermal conductivity. For a filler volume loading of 30%, the in-plane thermal conductivity was up to 14 times higher than the thermal conductivity of the matrix, while the loss factor decreased slightly. The permittivity increased with the increasing filler volume content, while the CTE also decreased. Though the filler affects the mechanical properties negatively, 40% of the tensile strength could be maintained if a filler volume content of 30% is not exceeded. Such compositions may be used as raw materials for future printed circuit boards.

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“…For detailed information about X-ray stress analysis (XSA) the authors refer to the available textbooks (for example, Hauk, 1997;Noyan & Cohen, 1987;Spiess et al, 2019;Birkholz, 2006). Here, only a brief summary is presented in order to explain the basis of the residual stress analysis used in EDDIDAT.…”

Section: Theory Of Ed Depth-resolved X-ray Stress Analysismentioning

confidence: 99%

EDDIDAT: a graphical user interface for the analysis of energy-dispersive diffraction data

et al. 2020

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EDDIDAT is a MATLAB-based graphical user interface for the convenient and versatile analysis of energy-dispersive diffraction data obtained at laboratory and synchrotron sources. The main focus of EDDIDAT up to now has been on the analysis of residual stresses, but it can also be used to prepare measurement data for subsequent phase analysis or analysis of preferred orientation. The program provides access to the depth-resolved analysis of residual stresses at different levels of approximation. Furthermore, the graphic representation of the results also serves for the consideration of microstructural and texture-related properties. The included material database allows for the quick analysis of the most common materials and is easily extendable. The plots and results produced with EDDIDAT can be exported to graphics and text files. EDDIDAT is designed to analyze diffraction data from various energy-dispersive X-ray sources. Hence it is possible to add new sources and implement the device-specific properties into EDDIDAT. The program is freely available to academic users.

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Moderne Röntgenbeugung

Cited by 40 publications

References 0 publications

Polypropylene Filled With Glass Spheres in Extrusion‐Based Additive Manufacturing: Effect of Filler Size and Printing Chamber Temperature

Polypropylene Filled With Glass Spheres in Extrusion‐Based Additive Manufacturing: Effect of Filler Size and Printing Chamber Temperature

Thermal, dielectric, and mechanical properties of h‐BN‐filled PTFE composites

EDDIDAT: a graphical user interface for the analysis of energy-dispersive diffraction data

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