Sang-Jin Lee

Title: Innovations of Sang-Jin Lee

Introduction

Sang-Jin Lee is a notable inventor based in Chonnam, South Korea. He has made significant contributions to the field of ceramic composites, focusing on enhancing their toughness and mechanical properties. With a total of 2 patents, his work has implications for various high-temperature applications.

Latest Patents

Sang-Jin Lee's latest patents include innovations in high-temperature tolerant ceramic composites. This invention relates to a ceramic composite that exhibits enhanced toughness and decreased brittleness. The composite comprises a first matrix that includes a first ceramic material, such as alumina, mullite, yttrium aluminate garnet, yttria stabilized zirconia, celsian, and nickel aluminate. Additionally, it features a porous interphase region that includes a substantially non-sinterable material, which can include alumina platelets. These platelets lie in random 3-D orientation, providing a debonding mechanism that is independent of temperature in chemically compatible matrices. The non-sinterable material induces constrained sintering of a ceramic powder, resulting in permanent porosity in the interphase region. For high-temperature properties, the addition of a sinterable ceramic powder to the non-sinterable material provides sufficiently weak debonding interphases. The ceramic composite can be provided in various forms, including a laminate, a fibrous monolith, and a fiber-reinforced ceramic matrix.

Another significant patent by Sang-Jin Lee focuses on toughening ceramic composites through transformation weakening of interphases. This invention provides a toughened ceramic composite and a method to enhance the mechanical strength of ceramic matrix composites using a transformation weakened interphase material. The ceramic composite includes a ceramic matrix, a second material as a second phase, and a metastable interphase material positioned between the ceramic matrix and the second phase material. The metastable interphase material is capable of undergoing a shear or stress-induced phase transformation, which may or may not involve a crystallographic unit cell shape change.

Career Highlights

Sang-Jin Lee has worked at prestigious institutions, including the University of Illinois. His research has significantly advanced the understanding and application of ceramic materials in various industries.

Collaborations

One of his notable collaborators is Waltraud M Kriven, with whom he has worked on various projects related to ceramic composites.

Conclusion