(Ca,Mg)α′-Sialon-AlN-TiN粉的影響
( 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: 以含鈦高爐渣、硅灰、 高鋁礬土熟料和炭黑為原料， 采用碳熱還原氮化法合成了(Ca, Mg)α′-Sialon-AlN-TiN粉。 用X射線衍射法測定了產(chǎn)物相組成及相對含量，研究了合成溫度和恒溫時間對反應(yīng)過程的影響， 并對合成機理進行了探討。 結(jié)果表明： 合成溫度對(Ca, Mg)α′-Sialon-AlN-TiN粉的合成過程影響顯著， 隨著合成溫度升高， 產(chǎn)物中α′-Sialon相含量增大， 1 480 ℃時α′-Sialon含量達最大， 是最佳的合成溫度。恒溫時間對產(chǎn)物相組成的影響不十分顯著， 但較長的恒溫時間可使還原氮化反應(yīng)進行得更充分， 恒溫8 h的試樣中α′-Sialon含量最高， 是較理想的恒溫時間。 合成過程中SiO的揮發(fā)導致試樣較大的質(zhì)量損失，且隨著合成溫度升高和恒溫時間延長而增大。
關(guān)鍵字: 含鈦高爐渣；碳熱還原氮化； (Ca, Mg)α′-Sialon-AlN-TiN；工藝參數(shù)； 合成機理
of (Ca, Mg)α′-Sialon-AlN-TiN powders from
titanium-bearing blast furnace slag by carbothermal reduction-nitridation
（1. School of Materials and Metallurgy, Northeastern University,
Shenyang 110004, China;
2. Department of Metallurgy Engineering,
Liaoning Institute of Science and Technology, Benxi 117022, China）
Abstract: With titanium-bearing blast furnace slag, silica fume, bauxite chalmette and carbon black as raw materials, (Ca, Mg)α′-Sialon-AlN-TiN powders were synthesized by carbothermal reduction-nitridation (CRN). Phase composition of reaction products was determined by X-ray diffractometry. The influence of synthesis temperature and holding time on synthesis was studied and synthesis mechanism was discussed in detail. The results show that synthesis temperature affects the formation of (Ca, Mg)α′-Sialon-AlN-TiN significantly. Content of α′-Sialon in the products increases with the increase of synthesis temperature and reaches the maximum at 1 480 ℃, which is assumed to be the best synthesis temperature. Holding time does affect the phase composition significantly, but with holding time expending, carbothermal reduction-nitridation reaction proceeds much sufficiently. Content of α′-Sialon in the samples reaches the maximum at 8 h, which is perfect holding time. Volatilization of SiO results in great mass loss of the samples and increases with synthesis temperature increasing and holding time expending.
Key words: titanium-bearing blast furnace slag; carbothermal reduction-nitridation; (Ca, Mg)α′-Sialon-AlN-TiN; process parameter; synthesis mechanism
