??? ???? ???? ?? ??? 3.175mm ??? ??? ?? ??? ???? ?? ??? ??? ????. ???? ?? ??? ???? ??? ??? ?????? ?? ??? ??? ??, ?? ?? ??, ?? ??, ?? ??? ? ??? ??? ?? ??? ??? ???????.
??? ??? ??? ?????? :
http://www.tungsten-carbide.com.cn/Korean/index.html

??? ???? ???? ?? ??? ??? ??? 6 ?? % ?? 14 ?? %? ??? ? ? ??? ??? ????? ?? ???? ???? ??? ???? ? ?????? ????. ??? ??? ???, ??, ??? ? ???? ???? 0.04≤ (c + d) / (a ??+ b + c + d) ≤0.10 ? 0.50≤c / (c + d? ??? ????? ?? ???? ??? ≤0.95, ??? a, b, c ? d? ?? ???, ???, ?? ? ???? ???? ????. ??? ?? ??? ???? ???? ?? ??? ????? ???? ??????? ????. ?? ???? ?? ?? ???? ?? ??? ????? ??? ???? ?? ?????.
 
					 
						
		![[Korean] ??? ???? ???? ?? ?? ??? ???? ???? ?? ?? ??](http://www.51zzhui.com/jp/wp-content/uploads/2020/05/tungsten-carbide-microdrill-bit-picture-1-702x336.jpg) 
					
										
								
				![[korean] ?? ?? ??? ?? ??? ???? ?? ?? ??? ?? ??? ????](http://www.51zzhui.com/jp/wp-content/uploads/2025/08/nano-tungsten-trioxide-applied-for-transparent-heat-insulation-glass-picture-214x140.jpg) 
									 
									![[korean] ?? ?? ??? WO3 ?? ?? ?? ??? WO3 ??](http://www.51zzhui.com/jp/wp-content/uploads/2025/08/wo3-powder-applied-for-transparent-heat-insulation-glass-picture-214x140.jpg)