Titanium alloy fine casting melting method

A titanium alloy and precision casting technology, applied in the direction of casting mold, casting mold composition, casting molding equipment, etc., can solve the problems affecting the application of titanium alloy, difficulty in manufacturing casting blanks, poor alloy performance, etc., and achieve excellent corrosion resistance. , to solve the surface accuracy problem, the effect of structural refinement

Inactive Publication Date: 2008-03-19
DALIAN JINMEI VALVE
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Problems solved by technology

It is very difficult to manufacture casting blanks, and the properties of alloys are not good, etc.
Affected the application of titanium alloy

Method used

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  • Titanium alloy fine casting melting method
  • Titanium alloy fine casting melting method

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Embodiment Construction

[0021] As shown in Figure 1, the titanium alloy precision casting and smelting method is mainly to make the shell after the wax mold, and then go through dewaxing, shell firing, pouring and post-processing steps:

[0022] Shell making and firing: NaLcog1130 silica sol is used as the binder: Si02=30%PH=10 Average particle size 8μm Average surface area 275m 2 / , 1.214g / cm 3 , Viscosity: less than 10CP (1CP=10 -3 )Pa.S)Na20=0.70%. The refractory filler is mixed with 95% yttrium oxide and 5% zirconia through electric fusion processing, and then crushed into 325 mesh powder, yttrium oxide-silica sol coating, adding a certain amount of base ion source to adjust the pH value of the coating to PH≥ 11. This kind of paint can guarantee that it will not gel for 6 days or more, and the viscosity of the paint should be controlled at 36-42 seconds. The temperature requirement of the shell-making operation room during shell-making: 26°C±1°C. The first and second layers use fused Zr02, wit...

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Abstract

The invention relates to a method of processing titanium alloy. The method of casting and melting the titanium alloy is: after wax pattern is made, a shell is made; and then processes of de-waxing, roasting, pouring and post-processing are practiced. Wherein, the process of roasting adopts fireproof silica solution coating to make the shell. Refractory fillers are yttrium oxide of 95 per cent and zirconia mixture powder of 5 per cent. The shell is made up of 6 layers and a half to 8 layers and a half. The process of melting begins when vacuum of the melting and the pouring reach 6.65 to 0.665 Pa. When the temperature of titanium reaches the required temperature, a centrifugal rotary table is started and rotational speed is adjusted to reach all values. The whole pouring process is completed within 3 to 5 minutes. After a casting is cooled in a furnace until the temperature of the casting is below 400 DEG C, a precise casting of titanium alloy is manufactured. The titanium alloy manufactured by the invention has a wider operation temperature range, the low temperature of which is 253 DEG C below zero and the high temperature of which is 550 DEG C. The titanium ally manufactured by the invention has low density, light weight, high strength, good resistance to decay and stable property, which can be used in different medium such as nitric acid and manganic acid.

Description

Technical field: [0001] The invention relates to a titanium alloy processing method. Background technique: [0002] With the construction of high value-added ships, titanium alloy valves are widely used in ships. In addition, aviation and other industries also need a large amount of titanium alloys. Because titanium alloys are too active, they can react with oxygen, nitrogen, hydrogen, silicon, and carbon. Various acids react with various oxides, such as SiO2, Mgo, etc., so the gradual production of titanium and titanium alloys brings great difficulties from shell making, smelting and pouring. At present, most titanium alloys are inverted, and cast with tools after smelting. The smelting and casting process is complicated, and the process conditions are not ideal. The smelting equipment uses vacuum consumable electrode arc shell furnace, but the consumable electrode it uses It is very troublesome to manufacture, and the superheat of the second titanium liquid is limited, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22D21/00
Inventor 于长鲲张令建
Owner DALIAN JINMEI VALVE
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