公开(公告)号：US20210163301A1

公开(公告)日：2021-06-03

申请号：US17105200

申请日：2020-11-25

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Sang Whan PARK ,  Mi Rae YOUM ,  SUNG IL YUN

IPC: C01B32/97 ,  C01B32/977

Abstract: The present disclosure provide a method for producing large granular high-purity α-phase silicon carbide powders using a silicon dioxide/carbon composite, the method including: producing a gel in which the carbonaceous compound is dispersed in a silicon dioxide network structure through a sol-gel process using starting materials including liquid phase silicon containing compounds and liquid phase carbonaceous compounds; subjecting the gel to first heat treatment to thermally decompose the carbon carbonaceous compound, thereby producing a silicon dioxide/carbon composite including nano-sized carbon particles; and subjecting the silicon dioxide/carbon composite to second heat treatment at a higher temperature than that of the first heat treatment to obtain large granular high-purity α-phase silicon carbide powders.

公开(公告)号：US20210269364A1

公开(公告)日：2021-09-02

申请号：US17184081

申请日：2021-02-24

Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Sang Whan PARK ,  Mi Rae YOUM ,  SUNG IL YUN ,  Jun Hyung PARK

IPC: C04B35/563 ,  C04B35/645

Abstract: The present disclosure provides a boron carbide composite material having a novel composition with excellent mechanical properties, and a production method therefor. The boron carbide composite material has high fracture toughness and may be applied as a lightweight bulletproof ceramic material. The boron carbide composite material is a boron carbide/silicon carbide/titanium boride/graphite (B4C—SiC—TiB2—C) composite material. The composite material may overcome a technical limitation on increasing the fracture toughness of the boron carbide composite material, and may be produced as a high-density boron carbide composite material using a reactive hot-pressing sintering process at a relatively low temperature. The boron carbide composite material having excellent mechanical properties may be applied to general industrial wear-resistant parts and nuclear-power-related industrial parts, and particularly, may be actively used as a lightweight bulletproof material for personal use and for military aircraft including helicopters.