( 1. 東北大學 材料與冶金學院，沈陽 110004;
2. 遼寧科技學院冶金工程系，本溪 117022)
摘 要: 在熱力學分析的基礎(chǔ)上，以含鈦高爐渣為主要原料，采用碳熱還原氮化法合成了(Ca, Mg)α′-Sialon-AlN-TiN粉。確定了合成過程的最佳工藝參數(shù)：反應(yīng)溫度1 480 ℃，保溫10 h，配碳量為理論值的1.5倍，氮氣流量400 mL／min。采用X射線衍射儀和掃描電鏡研究了合成產(chǎn)物的相組成和顯微結(jié)構(gòu)。結(jié)果表明：產(chǎn)物中除有主要物相α′-Sialon、AlN和TiN外，還有少量β-SiC，15R和β-CaSiO3等雜質(zhì)相。其中，(Ca, Mg)α′-Sialon多以片狀而AlN多以球形或短柱狀形式存在。EDS分析結(jié)果表明， Ca2+、Mg2+都進入了α′-Sialon晶格中，但Ca2+的固溶量遠高于Mg2+。
關(guān)鍵字: 含鈦高爐渣; 碳熱還原氮化; (Ca, Mg)α′-Sialon-AlN-TiN
powders from titanium-bearing
blast furnace slag
（ 1. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. Metallurgy Engineering Department,
Liaoning Institute of Science and Technology, Benxi 117022, China）
Abstract: Based on thermodynamic analysis, (Ca, Mg)α′-Sialon-AlN-TiN composite powders were prepared by carbothermal reduction-nutridation from titanium-bearing blast furnace slag. The reaction process of synthesizing (Ca, Mg) α′-Sialon-AlN-TiN powders was confirmed and the optimum synthesizing process parameters were: reaction temperature 1 480 ℃, holding time 10 h, 1.5 times of theoretical consuming carbon mass, nitrogen gas flow of 400 mL/min. The phase composition and microstructure of sintered materials were investigated by X-ray diffraction and scanning electron microscope. The results show that the final products consist mainly of α′-Sialon, AlN and TiN. Small amounts of β-SiC, 15R and β-CaSiO3 were also identified in the synthesized powder. (Ca, Mg)α′-Sialon presented flaky grains and AlN taken on globular or short columnar shape mainly. EDS analysis result reveals that the solubility of Ca2+ is much higher than that of Mg2+ in the α′-Sialon lattice.
Key words: titanium-bearing blast furnace slag; carbothermal reduction-nitridation; (Ca, Mg)α′-Sialon-AlN-TiN
