表面涂覆提升氧化铝材料的冲压机械强度  

Impulse mechanical strength improvement of alumina by surface coating

作　　者：陈志强 罗玉宏 梁竞华 刘梦然 王青 董啸天 CHEN Zhiqiang;LUO Yuhong;LIANG Jinghua;LIU Mengran;WANG Qing;DONG Xiaotian(Beijing Key Laboratory of Research and Application for Aerospace Green Propellants,Beijing Institute of Aerospace Testing Technology,Beijing 100074,China;Aerospace Liquid Propellant Research Center,Beijing Institute of Aerospace Testing Technology,Beijing 100074,China)

机构地区：[1]北京航天试验技术研究所航天绿色推进剂研究与应用北京市重点实验室,北京100074 [2]北京航天试验技术研究所航天液体推进剂研究中心,北京100074

出　　处：《材料工程》2024年第3期176-181,共6页Journal of Materials Engineering

摘　　要：为了有效提升氧化铝材料的冲压机械强度,通过表面涂覆的方式对该材料的孔道结构进行改性。利用DL-3型强度测试仪测试发现,表面涂覆氯化铝的氧化铝样品在100~1100℃的温度范围内焙烧后,冲压机械强度从35 MPa提升至51 MPa,表面涂覆铝基络合的氧化铝样品在相同条件下,冲压机械强度从21 MPa提升至46 MPa,相比较而言,无表面涂覆的氧化铝样品在相同条件下,冲压机械强度从17 MPa提升至39 MPa。结合扫描电镜和X射线衍射等表征发现:氯化铝和铝基络合物的表面涂覆对氧化铝材料晶体类型影响较小,但是能够有效填充氧化铝材料的基体孔道,增加载体的密实程度,进而有效提升氧化铝材料的冲压机械强度。另外,相对于表面涂覆铝基络合物的氧化铝样品,表面涂覆氯化铝的氧化铝材料经过高温焙烧后比表面积更大、孔径更小、孔径分布也更为集中。更为重要的是:表面涂覆氯化铝的氧化铝样品,经过高温焙烧后表面会形成利于稳定活性金属的粗糙形貌。To increase the impulse mechanical strength of alumina,the pore structure of alumina was modified by surface coating.It was found that the impulse mechanical strength of alumina samples coated with aluminum chloride increases from 35 MPa to 51 MPa and the mechanical strength of alumina samples coated with aluminum-based complex increases from 21 MPa to 46 MPa at the calcination temperature range of 100℃to 1100℃by the DL-3 typed impulse mechanical strength test device,while the mechanical strength of uncoated alumina samples increases from 17 MPa to 39 MPa.According to scanning electron microscopy and X-ray diffraction,the surface coating of aluminum chloride has little influence on the crystal type of alumina materials after high temperature calcination.At the same time,it can effectively fill the matrix pore of alumina materials,increase the density of the support,and improve the mechanical strength of alumina materials.In addition,compared with the alumina sample coated with aluminum complex,the alumina material coated with aluminum chloride possesses larger surface area and smaller pore size after high temperature calcination.More importantly,the surface of the alumina sample coated with aluminum chloride formed a rough shape after high temperature calcination,which was beneficial to the loading and dispersion of the active metals.

关 键 词：氧化铝 冲压机械强度 表面涂覆 氯化铝 

分 类 号：O614.31[理学—无机化学]