Few of them based on china ' s notorious tabula rasa , many of them try to find new relationships between historical substance and new buildings , others effectively densify carelessly planned extensions 它们中鲜有，其中很多都致力于找到历史遗存与新建筑的全新关系，另外一些则有效地改善了缺乏规划的扩建工程。
2.
The results show that " the frame - pack rolling " technology can increase the densify , avoid cracking during rolling , and effectively improve the deformability and mechanical properties of the spray deposited porous aluminum alloy sheets 结果表明：外框限制轧制工艺提高了喷射沉积多孔材料的致密度，避免了轧制过程中裂纹的形成，有效地改善了喷射沉积板坯的轧制性能及材料的力学性能。
3.
Cyclic pressing is a new kind of densification processing , which is introduced to densify as - deposited ring of al - 20 % si / sicp . this paper includes the densification result and rule of this technics . the research shows that this technics can be successfully used to densify spray - forming porous material and can be availably adopted to improve mechanical performance and microstructure . this technics is characterized by simple equipment 、 small expense and flexible process , and these characters will make it come true to producing spray - deposited rings less costly 本文采用一种新型致密化工艺?楔压工艺?对喷射沉积al - 20 % si / sicp大环进行了致密化加工,采用密度硬度分布、抗拉强度变化和检测显微组织变化的实验研究方法对其致密化效果及该工艺规律进行了研究,通过研究表明了楔压工艺可以成功地用来致密化喷射沉积多孔材料,该工艺有效地提高了喷射沉积大环件的致密度和抗拉强度并改善了组织。
4.
In this dissertation , al - si / sicp composites brake rotor with diameter of 1200mm was firstly fabricated by a novel spray deposition technology , and simultaneously coupled brake pad was prepared by a novel dry - powder processing route , termed as two - step pressing process . a wedge pressing technology was developed to densify the as - produce al - si / sicp composite brake rotor 本文首次采用喷射沉积技术制备了直径达1200mm的al - si / sicp制动盘,同时采用二次压制工艺制备出了配套的合成闸片,研究了制动盘的楔压致密化技术、机理,复合材料摩擦磨损性能及机理。
5.
As an advanced materials preparation technology , spray - deposition has shown remarkable superiority in producing large - sized alloys and metal matrix composites . however , the spray deposeted preforms usually contain a certain quantity of porosity . besides , the oxide films on the surface of the particles lead to week metallurgic conjunction between the particles . in order to obtain an ideal structure and performance , the porous preforms need further densifying and plastical forming . in this paper , a new technology named wedge pressing was used to densify spray - deposeted 5a06 aluminium alloy , in which the large deformation can be obtained through the sum - up of local deformation and multi - step small deformation . this method can also solved the problems in traditional processing and greatly decreased the producing cost . what ’ s more , the reserch on the wedge pressing desification rules about the large - sized spray deposeted preforms was significant it was vital not only to the further densification of the prefoums but also to the further research on plastical deforming the research was also benefit to the industrialization an the application of the spray deposeted porous materials 坩埚移动式喷射沉积技术作为一种先进的材料制备新技术,在制备大尺寸合金及金属基复合材料方面具有显著的优越性。然而喷射沉积坯件特别是大型坯件通常存在一定量的孔隙,颗粒表面存在一定量的氧化膜,颗粒之间未能完全达到良好的冶金结合状态,因此需要进行后续致密化和塑性变形才能获得理想的组织和性能。本文采用一种新型的楔形压制工艺,即通过局部变形、多道次小变形累积实现大变形的致密化加工方法,对喷射沉积多孔坯料进行后续致密化和塑性变形,很好地解决了传统加工工艺的难题,大大降低了生产成本。
