Publication

Freeform Microstructuring of Cast Polymer-Derived Ceramics by Sacrificial Direct Laser Writing

2021
Talks

Abstract

Polymer-derived ceramics are known for their resistance to high temperatures and harsh environments as well as property tunability and compatibility with various shaping techniques. We demonstrate here a new hierarchical micro-manufacturing process combining the advantages of casting and direct laser writing. The parts’ general shape is defined by a reusable silicon mold whereas individual freeform microfeatures such as a micro QR-code are implemented through the addition of sacrificial photoresin microstructures. An organopolysilazane-based formulation is cast and thermally converted into SiCN. Resulting parts are fully dense, have the microstructure imprinted, and exhibit high mechanical strength and tunable electrical properties.

Official source

https://infoscience.epfl.ch/entities/publication/cb32af7f-6fcb-41ed-80b4-06ce40220842

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2021
Talks

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cb32af7f-6fcb-41ed-80b4-06ce40220842

About this result

Related concepts (32)

Ceramic engineering

Ceramic engineering is the science and technology of creating objects from inorganic, non-metallic materials. This is done either by the action of heat, or at lower temperatures using precipitation reactions from high-purity chemical solutions. The term includes the purification of raw materials, the study and production of the chemical compounds concerned, their formation into components and the study of their structure, composition and properties. Ceramic materials may have a crystalline or partly crystalline structure, with long-range order on atomic scale.

Tunable metamaterial

A tunable metamaterial is a metamaterial with a variable response to an incident electromagnetic wave. This includes remotely controlling how an incident electromagnetic wave (EM wave) interacts with a metamaterial. This translates into the capability to determine whether the EM wave is transmitted, reflected, or absorbed. In general, the lattice structure of the tunable metamaterial is adjustable in real time, making it possible to reconfigure a metamaterial device during operation.

Cast iron

Cast iron is a class of iron–carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured; white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing.