And study the influence of welding speed and active gas for welding porosity defect. 着重研究了焊接速度与活性气体对气孔形成的影响关系。
The results show that the additions of active NR powder and nano-fiber mineral can improve the particle grade of the system and the microstructure of secondary interface in the cement-based materials can increase uniformity, reduce porosity and optimize pore structure of the system. 结果表明,加入活性NR粉纳米纤维矿物可改善体系的颗粒级配和水泥基材料中二级界面的显微结构,提高均匀性,降低孔隙率,优化体系的孔结构。
There was only a physical filling effect for both active and inert mineral admixtures during the initial hydration period. The porosity and strength of the pastes were controlled by the proportion of mineral admixtures. 常温水化初期,活性与惰性矿物掺合料都只具有物理填充的作用,硬化浆体的孔隙率和强度由矿物掺合料的掺量所决定。
In this paper we briefly analyze the mechanism of engendering pores in powder metal material ( PM), and study the influence of welding speed and active gas for welding porosity defect. 简要分析了粉末冶金材料激光焊接中气孔的产生机理,着重研究了焊接速度与活性气体对气孔形成的影响关系。
The existence of active source rocks and reservoir rocks with relatively high porosity and permeability in the deep part of basins is fundamental for petroleum accumulation in deeply buried subtle traps. 深部存在活跃源岩和具有较高孔隙度和渗透率的储层是深层隐蔽油气藏成藏的基础。
The results showed that the inclusion of active fillers could decrease the porosity of the green compacts effectively, increase ceramic yields of PCS by reacting with N 2, free carbon and/ or gas volatile of PCS during pyrolysis to produce new compounds. 研究表明,在先驱体中加入活性填料能有效降低陶瓷素坯的气孔率,可与PCS气态裂解产物、游离碳和(或)N2气氛反应生成新的化合物,提高PCS的陶瓷产率。
The measuring methods of various paste density and active material porosity of plate after formation are included and the controlling ways of porosity are also discussed. 并测定不同铅膏密度的生极板及化成极板活性物质的孔率,探讨控制活性物质孔率的途径。