How to measure the melt viscosity titanium plate

How to measure the melt viscosity titanium plate 
Drums and surface tension of the melt is aerospace investment casting cast alloy melt important physical properties, they are directly related to the melting conditions, but also decided plate fluid flow and an important factor in filling of titanium. 
     Viscosity of titanium former Soviet scholars have conducted a lot of research was, and that the new structure of the melt, whereas in the binary titanium plate, with the alloy to the transition from a single-phase region multiphase region, the viscosity increases several times. When the melt viscosity was measured using a titanium crucible twist method, the graphite material of the crucible, and the crucible was measured in the elastic suspension with the gold wire twisting motion. Since the graphite crucible materials Titanium Casting Manufacturer contaminate the carbon component alloy, therefore measured viscosity values will be affected, but by comparing different carbon titanium viscosity liquid at different temperatures, and extrapolated to determine the titanium plate viscosity of the melt.‪#‎Titanium_Casting_Golf_Heads‬,Titanium Welded Tubes,Titanium bicycle frames‪#‎Titanium_Casting_Golf_Heads‬,Titanium Welded Tubes,Titanium bicycle frames‪#‎Titanium_alloy_sheets‬,Titanium alloy valve,Titanium sheets

titanium foundry Titanium tube is removed by heat treatment

Titanium tube is removed by heat treatment method other substances
When excessive hydrogen content of sunrui titanium foundry , become brittle leaving notched impact toughness and tensile strength of a sharp decline in the general provisions of the hydrogen content of titanium tubes shall not exceed 0.015% . To reduce the amount of hydrogen absorption , parts should be removed prior to heat treatment fingerprints, rolling mill mark , grease and other residue , no vapor heat treatment furnace atmosphere . If the hydrogen content of titanium tube exceeds the allowable value , must be removed by vacuum annealing . Dehydrogenase is generally vacuum annealing at 538-760 ℃, maintained under a pressure lower than 0.066Pa 2-4h.
    When the temperature does not exceed 540 ℃ , the titanium oxide film surface of the tube does not significantly thickened , however, the heat treatment at higher temperature (760 ℃ above ) , the oxidation rate is rapidly increased, sunrui Titanium Artificial Joint and the oxygen expansion inside material to form a diffusion layer - contaminated layers. Oxygen contamination layer has a high ratio leads to brittle parts of the surface cracks and damage. Removing contaminated layers of oxygen with mechanical processing methods ( such as room cut , sandblasted , etc. ) , or pickling, chemical milling and other chemical methods , in the heat treatment , the heating time should be guaranteed under the premise of the heat treatment is shortened as much as possible meteorite , but also in performed in a vacuum furnace or an inert gas (argon , nitrogen, etc. ) furnace . Application of appropriate Xu Min can avoid or reduce contamination titanium Titanium casting tube furnace parts heating in air generated .

Impact on performance titanium heat treatment cycle

The phase transition in titanium stress is small, with a simple heat treatment, it is difficult to change the original casting organizations, especially the grain boundary organization. 
To refine casting titanium organization, people were cycling in the heat treatment. Volume effect of the use of the accumulation phase, resulting in 
And increased stress, prompting aerospace investment castings recrystallization, resulting in multilateral and grain refinement sheet of tissue. 
     Experimental results show that the alloy has Ti6A14v thick widmanstatten, the P-phase region through a ten cyclic heat treatment (980 a 
500 ℃), enables thin sheet first roughening, and broken off, so that the structure refinement. Then a continuous grain boundary is not 
Change, and even some coarsening. titanium precision casting  If the cyclic heat treatment (980 a 500 ℃, 10 times the water-cooled ten 900 ℃, 2h air-cooled) before pre-
P first heated to a broken fire zone (1010 ℃, water quenching), become fully martensite after cycle heating and cooling, a grain boundary 
Disappeared or broken off, the degree of refinement and organizational uniformity will increase its alloys have significantly improved fatigue performance.

Titanium pump and electric clearing ion pump

Method for trapping gas molecules can also use ionizing adsorption. Using a high-speed electron impact gas molecules can be obtained positive ion, positive ion in the electric field was banished to the negative electrode,titanium ingot price and after due to intermolecular Vander Vauls Ley was metal adsorption and no longer leave electrode.

  This reduces the space gas molecule concentration can be obtained, the purpose of vacuum. This phenomenon is called electric clearance, using the electric clearance to reach the purpose of degassing pump ( titanium pumps )called ion pump. Gas ion pump on the adsorption of no selective.