Effect of Molding Press Direction on Properties of Periclase-spinel-carbon Brick

The effect of press direction on the thermal expansion, slag resistance, etc. of periclase spinel carbon brick has been studied in this article. The results show that the thermal expansion rate in the direction parallel to the press axis is larger than that in the direction perpendicular to the press axis and the slag resistance in the direction parallel to the press axis is much better than that in the perpendicular direction. The directional distribution of graphite in the specimen is observed with the microscope.

热等静压及恢复热处理工艺对DZ125蠕变损伤的影响

选用4种不同参数的热等静压及恢复热处理工艺对DZ125蠕变损伤试样进行显微组织演化的研究,并进行力学性能评价。结果表明:DZ125合金经预持久损伤实验后,显微组织出现了γ′相退化、蠕变孔洞形成等,但是碳化物没有出现由MC型向M_(23)C_6及M6C型分解。此外,热等静压的温度在孔洞愈合过程中作用显著,1200℃及1250℃温度下分别出现了γ′同心筏排结构及合金的初熔现象。同时,通过选取合适的热等静压参数,可以避免内部再结晶的产生。合理的热等静压及恢复热处理工艺可以改善蠕变损伤的显微组织,并使其显微硬度达到原始态水平,且持久寿命得到提高。

一种新型自动拉布机的设计

针对目前服装制作企业广泛运用人工拉料劳动强度大、效率低以及现有拉布设备只能单向拉布且断布等问题,通过对人工拉料和现有拉布设备的分析,设计了一种新型自动拉布机,包括铺布平台、拉布装置、铺布装置、压布装置,提高了拉布的品质和效率,也为同类设备的设计提供了参考。