西安交通大学学报
西安交通大學學報
서안교통대학학보
JOURNAL OF XI'AN JIAOTONG UNIVERSITY
2010年
5期
71-74
,共4页
氧化铝陶瓷%冲蚀磨损%磨粒硬度%高铬铸铁
氧化鋁陶瓷%遲蝕磨損%磨粒硬度%高鉻鑄鐵
양화려도자%충식마손%마립경도%고락주철
α-Al_2O_3 ceramics%erosion-wear%abrasive particle hardness%high chromium cast iron
以冲蚀磨损工况下的泵用材料Cr15Mo3高铬铸铁为对比材料,采用转盘式液-固双相流试验机研究了系列α-Al_2O_3结构陶瓷(90瓷、95瓷、99瓷)的耐冲蚀磨损性能及微观失效机制.结果表明:在不同磨粒硬度试验条件下,Cr15Mo3的冲蚀磨损率均比α-Al_2O_3结构陶瓷的高4～6倍,且随着磨粒硬度的增加,Cr15Mo3的冲蚀磨损率增加幅度更大;α-Al_2O_3结构陶瓷的冲蚀磨损体积随磨料含量的增加略有增加,但在相同磨粒硬度试验条件下相差不大,因此该工况下可使用90瓷或95瓷,从而提高应用材料的性价比;Cr15Mo3的微观失效有明显的方向性和腐蚀痕迹,主要以微切削、犁沟和冲蚀坑等形式为主,而α-Al_2O_3结构陶瓷的失效主要是晶界玻璃相失去,有少量冲蚀坑和晶粒剥落痕迹,迅速增加径向和横向断裂表面能是其主要耗能方式.
以遲蝕磨損工況下的泵用材料Cr15Mo3高鉻鑄鐵為對比材料,採用轉盤式液-固雙相流試驗機研究瞭繫列α-Al_2O_3結構陶瓷(90瓷、95瓷、99瓷)的耐遲蝕磨損性能及微觀失效機製.結果錶明:在不同磨粒硬度試驗條件下,Cr15Mo3的遲蝕磨損率均比α-Al_2O_3結構陶瓷的高4～6倍,且隨著磨粒硬度的增加,Cr15Mo3的遲蝕磨損率增加幅度更大;α-Al_2O_3結構陶瓷的遲蝕磨損體積隨磨料含量的增加略有增加,但在相同磨粒硬度試驗條件下相差不大,因此該工況下可使用90瓷或95瓷,從而提高應用材料的性價比;Cr15Mo3的微觀失效有明顯的方嚮性和腐蝕痕跡,主要以微切削、犛溝和遲蝕坑等形式為主,而α-Al_2O_3結構陶瓷的失效主要是晶界玻璃相失去,有少量遲蝕坑和晶粒剝落痕跡,迅速增加徑嚮和橫嚮斷裂錶麵能是其主要耗能方式.
이충식마손공황하적빙용재료Cr15Mo3고락주철위대비재료,채용전반식액-고쌍상류시험궤연구료계렬α-Al_2O_3결구도자(90자、95자、99자)적내충식마손성능급미관실효궤제.결과표명:재불동마립경도시험조건하,Cr15Mo3적충식마손솔균비α-Al_2O_3결구도자적고4～6배,차수착마립경도적증가,Cr15Mo3적충식마손솔증가폭도경대;α-Al_2O_3결구도자적충식마손체적수마료함량적증가략유증가,단재상동마립경도시험조건하상차불대,인차해공황하가사용90자혹95자,종이제고응용재료적성개비;Cr15Mo3적미관실효유명현적방향성화부식흔적,주요이미절삭、리구화충식갱등형식위주,이α-Al_2O_3결구도자적실효주요시정계파리상실거,유소량충식갱화정립박락흔적,신속증가경향화횡향단렬표면능시기주요모능방식.
Erosion resistance of series α-Al_2O_3 ceramics is investigated by water slurry with different abrasive particles hardness on a liquid-solid dual phase erosion test machine. High chromium cast iron Cr15Mo3 for industrial pumps is taken as a reference material in the erosion-wear test. The erosion-wear failure mechanism of the test materials in slurry erosion is discussed. The result shows that the slurry erosion volume of Cr15Mo3 is 4 to 6 times larger than that of series α-Al_2O_3 ceramics with the different abrasive particles hardness, and increases with the increasing abrasive particles hardness. The slurry erosion volume of series α-Al_2O_3 ceramics slightly increases with the increasing volume fraction of α-Al_2O_3, therefore the ceramics with 90% or 95% volume fraction of α-Al_2O_3 may replace the one with 99% volume fraction of α-Al_2O_3 in most cases to lower the material cost. It is observed bv SEM that there exist obvious corrosive and erosive pits on the worn surface of Cr15Mo3 iron, while a little such pits and particle stripping-off pits on the worn surface of the α-Al_2O_3 ceramics. The failure of the α-Al_2O_3 ceramics is mainly due to losing the binding phase in crystal boundary. The major mode of energy consumption of α-Al_2O_3 ceramics is rapidly increasing radial and transverse fracture surface energy.
