임경란 2024-01-12T08:10:15Z 2024-01-12T08:10:15Z 2000-11-17 https://pubs.kist.re.kr/handle/201004/81860 세라믹　소결체의　제조방법 Patent 2000-11-17 1992-12-09 3129870 4-351548 JA 특허 한국과학기술연구원