Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite

Sandro Aparecido Baldacim; Claudinei dos Santos; Olivério Moreira Macedo Silva; Cosme Roberto Moreira Silva

doi:10.4028/www.scientific.net/MSF.591-593.543

Paper Titles

Developing of Ceramic Roof Tiles Process by Powder Pressing and Firing in Roller Kiln
p.521

Study of Operational Conditions for the Precipitated Calcium Carbonate Production
p.526

Thermal and Physico-Mechanical Characterization of Paraíba’s State Soils to Applying in Soil-Cement Bricks
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Evaluation of Silicon Nitride Ceramic Cutting Tools with Diamond Coatings
p.537

Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite
p.543

Powder Diffraction of Components Subject to Corrosion in Fuse Cutouts with Ceramic Insulation
p.548

Evaluation of the Performance of α-SiAlON Tool when Turning Ti–6Al–4V Alloy without Coolant
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High Temperature Properties of Silicon Nitride with Neodymium Oxide Additions
p.560

α-SiAlON: Development and Machining Test on Gray Cast Iron
p.565

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Silicon Carbide Whiskers Interference on Silicon Nitride Based Composite

Abstract:

Silicon nitride based composite has been prepared, using a direct mixture process as alternative route. Silicon carbide whiskers were mixed directly to silicon nitride based powders containing yttrium and neodymium oxide as sintering aids. Uniaxial hot pressing was used to prepare sintered samples. Crystalline phases were identified using x-ray diffractometry. Intergranular phases were analyzed using Scanning Electron Microscopy. Some mechanical properties (microhardness and fracture toughness) were also evaluated. The obtained high values of fracture toughness were correlated to the activation of toughening mechanisms, such as crack bridging and crack deflection.