(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 研究了Co和Ti(CN)含量對(duì)梯度硬質(zhì)合金的力學(xué)性能、 梯度結(jié)構(gòu)的影響。 測(cè)試了梯度硬質(zhì)合金刀片的切削性能。 結(jié)果表明： 隨著合金鈷含量的增多， 合金梯度層厚度增厚， 梯度結(jié)構(gòu)越明顯； 合金的強(qiáng)度提高， 磁飽和提高， 磁力、 硬度和密度減小。 隨著合金Ti(CN)含量的增多， 合金梯度層厚度有變薄的趨勢(shì); 隨合金的硬度提高， 合金的強(qiáng)度和密度減小。 切削試驗(yàn)表明： 具有梯度結(jié)構(gòu)涂層硬質(zhì)合金刀片的切削性能比無(wú)梯度結(jié)構(gòu)涂層硬質(zhì)合金刀片的切削性能優(yōu)良。 達(dá)到同一磨損高度hB=0.15 mm時(shí), 前者的切削壽命較后者提高了近一倍。 同時(shí)隨著合金鈷含量的增多， 硬質(zhì)合金刀片的切削性能提高。
關(guān)鍵字: 硬質(zhì)合金; 梯度結(jié)構(gòu); 強(qiáng)度; 硬度; 切削性能
gradient structure
YANG Jian-gao, LONG Zheng-yi
（ State Key Laboratory of Power Metallurgy, Central South University,
Changsha 410083, China）
Abstract: The effect of cobalt and Ti(CN) content on the structure and properties of graded cemented carbides was studied . The results show that, with the increase of cobalt content, the gradient structure becomes more distinct and the thickness of gradient structure increases, meanwhile, the transverse rupture strength and the magnetism saturation increases, while the hardness, coersive force and the density decrease. With the increasing Ti(CN) content, the thickness of gradient structure decreases; meanwhile, the hardness and coersive force increase, while the transverse rupture strength and the density decrease. The cutting tests demonstrate that the cutting property of the coated cemented carbide with gradient structure is much better than those without gradient structure. The severability of the forth is about one and a half of that of the later at hB=0.15 mm. Meanwhile, with the increasing cobalt content, the cutting properties increase.
Key words: cemented carbide; gradient structure; strength ; hardness; cutting property
