纳米结构Al_2O_3+13%TiO_2热喷涂喂料的研究  

Study on Nanostructured Al_2O_3+13%TiO_2 Feedstock for Thermal Spray

作　　者：叶雄林[1] 李长青[1] 朱有利[1] 

机构地区：[1]装甲兵工程学院装备表面工程研究所,北京100072

出　　处：《热加工工艺》2005年第6期20-22,共3页Hot Working Technology

摘　　要：纳米结构的Al2O3+13%TiO2混合粉经过球磨制浆和喷雾干燥,制得了25～50μm的球形大颗粒结构,分别采用高温电炉和高速火焰两种方式,对喷雾造粒的纳米结构Al2O3+13%TiO2颗粒进行了致密化处理,制备了适合热喷涂的纳米颗粒喂料。测试了喂料形貌、晶粒尺寸及物相成分。分析结果表明,应用高温电炉烧结造粒喂料时,在选定的温度范围内(1100～1300℃),喂料的相成分没有改变,晶粒没有显著长大;采用高速火焰烧结造粒喂料,喂料经高温快速激冷,Al2O3晶粒尺寸仍在100nm以下,但因火焰温度高(2500～3200℃),相成分分析表明,喂料中发生α-Al2O3→γ-Al2O3及金红石TiO2→板钛矿TiO2的转变。Through using the step of ball milling, slurry forming and spray drying, the nanostructured Al2O3+13%TiO2 mixed powders were reconstituted 25~50 micron agglomerated particles. Two sintering technologies(high temperature elec tric furnace sintering and high velocity flame sintering)were used . The nanostr uctured feedstock for thermal spray was fabricated by sintering. The morphologie s, grain sizes and phase components of the feedstock were tested. The results sh ow that feeds phase components using high temperature electric furnace sintering at 1100～1300℃ do not change, the grain size do not increase, obviously. Feeds tock phase components using high velocity flame sintering changed because the fl ame temperature is 2500～3200℃ high, where α-Al2O3 changed to γ-Al2O3 and rut ile-TiO2 changed to brookite-TiO2, though grain size of nano-Al2O3 do not grow a nd is under 100nm because cooling velocity is too quick.

关 键 词：纳米结构喂料 等离子喷涂 烧结 晶粒尺寸 

分 类 号：TG174.442[金属学及工艺—金属表面处理]