Boron carbide:
Boron carbide (chemical formula approximately B4C) is an extremely hard boron–carbon ceramic material used in tank armor, bulletproof vests, engine sabotage powders, as well as numerous industrial applications.
en.wikipedia.org
碳化硼:
碳化硼（化學式B4C）是一種極硬的陶瓷材料，用於坦克車的裝甲、避彈衣和很多工業應用品中。
zh.wikipedia.org
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Boron carbide碳化硼