The current book contains twenty-two chapters and is divided into three sections. Section I consists of nine chapters which discuss synthesis through innovative as well as modified conventional techniques of certain advanced ceramics (e.g. target materials, high strength porous ceramics, optical and thermo-luminescent ceramics, ceramic powders and fibers) and their characterization using a combination of well known and advanced techniques.
Tham khảo sách 'advances in ceramics synthesis and characterization, processing and specific applications_1', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả
From high-performance, economical and environmental points of view, Powder metallurgy process shows remarkable advantages in production of parts and components due to their special compositions by elemental mixing and 3-dimensional near net shape forming methods. Powder metallurgy process can be applied to not only metal materials but also ceramics and organic materials, which both are employed as structural and electrical products.
laser fusing of ceramic powders to fabricate parts as an alternative to the use of metal powders. A system that would regulate and mix metal powder to modify the properties of the prototype is also being investigated. Optomec Design Company, Albuquerque, New Mexico, has announced that direct fusing of metal powder by laser in its LENS process is being performed commercially. Protypes made by this method have proven to be durable and they have shown close dimensional tolerances.
Sintering is one of the final stages of ceramics fabrication and is used to increase the strength of the compacted material. In the Sintering of Ceramics section, the fabrication of electronic ceramics and glass-ceramics were presented. Especially dielectric properties were focused on. In other chapters, sintering behaviour of ceramic tiles and nano-alumina were investigated. Apart from oxides, the sintering of non-oxide ceramics was examined.
Sintering refers to the science and technology of production objects from fines or
powders. Being a very complex phenomenon, sintering covers a broad subject field
and combines chemistry, physics and mechanics. Sintering deals with various material
systems such as metals, non-metals, ceramics, polymers, and their combinations.
Processes of sintering may occur in a wide temperature range - in a solid state as well
as with participation of a liquid phase.
POWDER METALLURGY has been called a lost art. Unlike clay and other ceramic materials, the art of molding and firing practical or decorative metallic objects was only occasionally applied during the early stages of recorded history. Sintering of metals was entirely forgotten during the succeeding centuries, only to be revived in Europe at the end of the 18th century, when various methods of platinum powder production were recorded (
In the additive RP processes, photopolymer systems are based on suc-
cessively depositing thin layers of a liquid resin, which are then solidi-
fied by exposure to a specific wavelengths of light. Thermoplastic sys-
tems are based on procedures for successively melting and fusing solid
filaments or beads of wax or plastic in layers, which harden in the air to
form the finished object. Some systems form layers by applying adhe-
sives or binders to materials such as paper, plastic powder, or coated
ceramic beads to bond them.