Progress in the fabrication of Si3N4 turbine rotors by pressure slip casting

Lyckfeldt, Ola; Lidén, Eva; Persson, Michael; Carlsson, Roger; Apell, Petra

doi:10.1016/0955-2219(94)90076-0

Cited by 17 publications

(8 citation statements)

References 8 publications

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“…In these methods, an external pressure (Ͻ4 MPa) substantially higher than the capillary suction pressure is applied to the ceramic suspension. 10 The traditional drain-casting methods are plagued by some generic problems. The liquid flow affects the suspension microstructure and tends to orient nonspherical constituents, such as whiskers.…”

Section: Current Processesmentioning

confidence: 99%

Novel Powder‐Processing Methods for Advanced Ceramics

Sigmund

Bell

Bergström

2000

Journal of the American Ceramic Society

444

252

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Novel approaches for optimized powder processing of advanced ceramics are reviewed with an emphasis on directcasting methods and solid freeform fabrication techniques. The fundamental principles for green body formation are discussed; a distinction is made between physical and chemical gels based on the nature of the induced gelation. An overview of the properties of dense suspensions is presented, with a focus on the factors controlling the maximum solids loading. Recent work on direct measurements of interparticle forces in ceramic systems is presented and related to rheological properties.

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Section: Current Processesmentioning

confidence: 99%

Novel Powder‐Processing Methods for Advanced Ceramics

Sigmund

Bell

Bergström

2000

Journal of the American Ceramic Society

444

252

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“…The measurement methods noted above À laser flash, hot-disk, and hot wire À do not take porosity in reticulate foams properly into account. Independent of pore form, dimension and size Lyckfeld et al [117] estimated an effective thermal conductivity λ eff depending on the volumetric porosity P vol ¼ V pores corresponding to the measured thermal conductivity λ means as follows:…”

Section: Thermal Characterizationmentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

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Reticulated ceramic foams are used in a wide range of applications such as filters, catalyst supports, lightweight materials, energy absorptions materials, or as scaffolds for tissue engineering as the most common ones. Based on gaseous foaming processes of polymers, a stochastic distribution of closed pores is obtained. By reticulation processing thin foam windows are removed between cells turning a closed cell into an open cell structure. These foams are used as template for porous ceramics manufacturing: With different processing approaches, for example, with dip coating of a ceramic slurry and a subsequent (multistep) thermal treatment ceramic reticulate foams are obtained. A variety of material properties strongly depend on the cell and strut size, as well on material composition. Functionalization of ceramic foam surfaces (outer surface functionalization), for example, with zeolites or nanosized aggregates lead to an increase of the specific surface area or provides catalytic or heat storage functionality. Filling of struts (inner surface functionalization) may lead to improved mechanical stability or may provide functionalities such as electric conductivity. The present work summarizes the processing steps from the template foam to the final cellular ceramic, functionalization strategies, and the most common characterization techniques.

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“…It is generally a slow process, because the casting rate decreases parabolically with thickness of the cast layer. Pressure casting is a modification of slip casting that has been developed to obtain a higher green density, and in this method, an external pressure below 4 MPa substantially higher than the capillary suction pressure is applied to the ceramic suspension . The traditional drain‐casting methods are plagued by some generic problems as the liquid flow affects the suspension microstructure and tends to orient nonspherical constituents, such as whiskers.…”

Section: Selection Of Near‐net Shape Fabrication Techniquementioning

confidence: 99%

Development of Silicon Nitride‐Based Ceramic Radomes — A Review

Kandi

Thallapalli

Rao

2014

Int J Applied Ceramic Tech

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Radome is an aerodynamic structural part attached to the fore‐end of a missile. It transmits electromagnetic signals with minimum attenuation and also protects radar communication system, and thus, the radomes are made of ceramics as they have desirable properties required by the radomes. The flexural strength, dielectric constant, and loss tangent values of various ceramic materials used in the development of radomes are important in the selection of radome materials. Different nose cone shapes of missile radomes are also important. Ceramic materials show variational properties with sintering time, temperature, and other additives. The existing different near‐net shape fabrication techniques for manufacturing of ceramic radomes are discussed and compared. Gelcasting is one of the manufacturing techniques to produce radomes with homogeneous and high green strength. Gelcast parts of silicon nitride ceramics are hard, tough, brittle, and wear‐resistant and are difficult to machine using conventional methods of machining. Therefore, laser‐assisted machining is used for fine finish of ceramic radomes with excellent surface integrity and productivity. This paper deals with a review of development of ceramic radomes, manufacturing methods for variety of applications.

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Progress in the fabrication of Si3N4 turbine rotors by pressure slip casting

Cited by 17 publications

References 8 publications

Novel Powder‐Processing Methods for Advanced Ceramics

Novel Powder‐Processing Methods for Advanced Ceramics

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

Development of Silicon Nitride‐Based Ceramic Radomes — A Review

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