摘要
探讨熔模型离心微铸造技术,并制备出适合于该技术的熔模材料,同时针对工艺参数对微拉伸件晶粒尺寸和硬度的影响规律进行研究。通过试验得出,α-高强石膏粉与耐高温氧化铝粉按质量比6∶4配制的熔模材料符合熔模型微铸造工艺的要求。该材料既能很好复制细节,并能高温烧结,同时易与金属微拉伸件分离。并依据熔模型离心微铸造技术,在离心转速1 500r/min,模具预热温度280℃条件下,制备出长30mm的微拉伸件,最小截面尺寸为0.43mm×1mm。同时得出,在模具预热温度一定时,随着离心转速的增加,液态金属在熔模型中充填长度增加,同时晶粒越来越细小,硬度逐渐增大。
T he technology of the centrifugal microcasting based on investment is discussed in this paper . T he chemical composition of investment is confirmed .T he influences of the processing parameters on the grain size and hardness of microscale tensile parts produced by microcasting are investigated .It is found from the experiments that the investment with α‐high‐strength gypsum powder and high temperature aluminum oxide powder （60/40 wt% ） conforms to the requirements of investment microcasting . The investment has the good ability of copying details ,and can be sintered to high temperature .Then it is separated easily with micro tensile parts of metal . On the basis of the microcasting , the microscale specimens with a nominal length of 30 mm and a smallest cross section of 0.43 mm × 1 mm are prepared under the condition of the rotational speed 1 500 r/min and the temperature 280 ℃ .Additionally ,the liquid metal filling length in investment mold increases with the increase of centrifugal speed under constant preheating temperature .Then constantly increasing centrifugal speed leads to finer grain size and higher hardness .
出处
《黑龙江工程学院学报》
CAS
2015年第4期43-46,61,共5页
Journal of Heilongjiang Institute of Technology
基金
黑龙江省教育厅骨干教师资助项目(1253G050)
关键词
微铸造
熔模材料
离心转速
预热温度
microcasting
investment
centrifugal speed
preheating temperature
