2014年10月31日星期五

Modern superplastic deformation theory that grain boundary sliding is the titanium alloy pump main way of superplastic deformation

Modern superplastic deformation theory that grain boundary sliding is the main way of superplastic deformation, diffusion and dislocation motion inside the grain and the grain boundary is the main coordinating mechanism of grain boundary sliding. Superplastic forming of titanium alloy pump  B-phase diffusion creep or dislocation creep dominated: A phase to the grain boundary sliding-based, coordinated jointly by diffusion and bit dislocation motion; A and B are two phases flow to A and B phase boundary migration to complete. Hydrogen in the titanium alloy superplastic forming :( mainly plays a role in the following) was added to increase the Titanium precision castings diffusivity of hydrogen in the alloy elements, resulting in enhanced B-phase diffusion slip A creep and intergranular phase. (2) the diffusion of hydrogen activated dislocation pinning promote the climb and slide dislocations, improved sliding capacity of B grains, the coordinating role of dislocations in favor of A / A grain boundary sliding requested. (3) hydrogen-induced weak bond effect, reducing the diffusion activation energy, enhanced atomic diffusion capacity, titanium casting process improve the superplastic flow capacity. (4) the addition of hydrogen significantly reduces B \ A + B transition temperature, increase the volume fraction of the B phase, a direct result of the increase and decrease the flow stress of the plastic, so that the titanium alloy can be deformed at a lower temperature and higher deformation rates were superplastic forming.

2014年10月19日星期日

After pouring liquid metal into the runner must maintain the continuity of the metal flow

After pouring liquid metal into the runner must maintain the continuity of the metal flow, the middle can not stop there. So we must pay great attention to the runner to select the size of the design and the electromagnetic pump and current values.Magnetic pump should be titanium alloy pump placed as far as possible at the level of the runner, but this system can reduce the consumption of casting metal.Used as pharmaceutical and food and other uses of the heat exchanger. Due to the strong corrosion resistance of titanium, the heat exchanger so long life, and maintenance costs, in use, is also less. In addition, because of its small size, large heat capacity, etc., related equipment (eg pumps) of investment and operating costs can also be titanium pumps reduced accordingly.Of commercially pure titanium is widely used in all kinds of seafood farming, water heat exchanger, brine heat, chemical, food, pharmaceutical, metallurgy, refrigeration, light industry.

2014年10月15日星期三

Artificial kidneys using a micro titanium heat pumps

Medical Applications : biocompatibility TiNi alloy good use of its shape memory effect and superelasticity medical instances considerable . If the filter thrombosis , spinal titanium casting companies orthopedic rods, tooth orthopedic wire, cerebral aneurysm clips, plates , intramedullary nail , titanium heat pumps artificial joints, contraceptive devices , cardiac repair components, artificial kidneys using a micro- pumps. Tech applications Outlook: The 20th century was the era of mechanical and electrical science . Sensing - IC - driving is the most typical mechanical and electronic control Titanium precision castings  but the complexity and huge . Shape memory materials both sensing and driven dual function , the control system can achieve miniaturization titanium heat pumps and intelligent robots such as holograms , ultra- millimeter micro robots. The 21st century will be the titanium heat pumps era of e- learning materials . Action shape memory alloy robot Titanium alloy sheets addition to temperature conditions without any environmental impact is expected in high-tech fields reactors, accelerators , space laboratories flourish. Memory alloy spoke alloys, of course, talk about the titanium heat pumps most interesting alloys - memory alloy . Metal has a memory , an accidental discovery.

2014年10月8日星期三

Titanium and titanium alloy pump foundry in magnetic

Improve the liquid metal is poured into the mold but also by the pressure of the electromagnetic force to the liquid metal up to achieve this is to magnetic casting. Its basic principle is the magnetic titanium alloy pump installed in the runner through titanium casting process the outer liquid metal to create a magnetic field; while the DC also introduced into this already established metal flow field, in the alternating magnetic field and electric field, forming a liquid metal flow of the same direction and the electromagnetic force, thereby increasing the pressure of the liquid metal filling the mold. This approach allows the flow rate of the metal in the cavity only by the titanium alloy pump flow rate of the sprue in the ram effect of the titanium alloy pump metal is increased from 2 to 2.5 times higher than the stationary casting. When using this method has several casting should be noted:
1 After pouring liquid metal into the runner must maintain the continuity of the metal flow, the middle can not stop there. So we must pay great attention to the runner to select titanium pumps the size of the design and the electromagnetic titanium alloy pump and current values.
2 magnetic titanium alloy pump should be placed as far as possible at the level of the runner, but this system can reduce the consumption of casting metal.