Ceramic Powder Forming

This lecture covers the process of forming ceramic powders to create green bodies, including dry pressing, wet shaping, plastic forming, and additive manufacturing techniques. It discusses the challenges and objectives of each method, such as achieving homogeneous green bodies and minimizing defects. Various shaping techniques like uniaxial and isostatic pressing, slip casting, and plastic forming are explained. The lecture also delves into the importance of drying and debinding processes in ceramic powder forming, highlighting the impact of density gradients and energy storage during pressing. Additionally, it explores examples of ceramic products made through different shaping methods, emphasizing the diverse applications and properties required for each. The session concludes with insights into the significance of removing organic additives before sintering.

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Related concepts (37)

MSE-214: Mise en oeuvre des matériaux I

Introduction aux relations mise en œuvre-structures-propriétés des polymères et céramiques, fournissant les bases nécessaires à la sélection de matériaux et procédés pour la fabrication de composants

Plastic

Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptability, plus a wide range of other properties, such as being lightweight, durable, flexible, and inexpensive to produce, has led to its widespread use. Plastics typically are made through human industrial systems.

Plastic recycling

Plastic recycling is the processing of plastic waste into other products. Recycling can reduce dependence on landfill, conserve resources and protect the environment from plastic pollution and greenhouse gas emissions. Recycling rates lag those of other recoverable materials, such as aluminium, glass and paper. Through 2015, the world produced some 6.3 billion tonnes of plastic waste, only 9% of which has been recycled, and only ~1% has been recycled more than once.

Plastic pollution

Plastic pollution is the accumulation of plastic objects and particles (e.g. plastic bottles, bags and microbeads) in the Earth's environment that adversely affects humans, wildlife and their habitat. Plastics that act as pollutants are categorized by size into micro-, meso-, or macro debris. Plastics are inexpensive and durable, making them very adaptable for different uses; as a result, manufacturers choose to use plastic over other materials.

Ceramic

A ceramic is any of the various hard, brittle, heat-resistant, and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain, and brick. The earliest ceramics made by humans were pottery objects (pots, vessels, or vases) or figurines made from clay, either by itself or mixed with other materials like silica, hardened and sintered in fire.

Ceramic matrix composite

In materials science, ceramic matrix composites (CMCs) are a subgroup of composite materials and a subgroup of ceramics. They consist of ceramic fibers embedded in a ceramic matrix. The fibers and the matrix both can consist of any ceramic material, whereby carbon and carbon fibers can also be regarded as a ceramic material. The motivation to develop CMCs was to overcome the problems associated with the conventional technical ceramics like alumina, silicon carbide, aluminum nitride, silicon nitride or zirconia – they fracture easily under mechanical or thermo-mechanical loads because of cracks initiated by small defects or scratches.