想問一下~碳化鈦是不是比碳化鎢硬???

之前看一本書上面介紹硬度的分類~~上面寫碳化鈦比碳化鎢硬~~我就納悶了~那為什麼市面上切些工具還是只用到碳化鎢~卻沒用到碳化鈦?
��碳化鈦 (TiC)性質An extremely hard and light refractory material with high thermal shock and abrasion resistance. It is used for powder metallurgical (P/M) parts including cutting tool tips

dies and wear parts and resistant coatings. It is also used as an additive to plastic