Growth in the fast lane into the car with titanium

Titanium is a new structural and functional materials, it has excellent overall performance, density, high specific strength. Higher than the strength of the titanium alloy aluminum and steel, toughness and steel quite. Titanium and titanium alloy corrosion performance is good, better than stainless steel, particularly resistant to corrosion and micro-oxidizing atmosphere under chloride ion corrosion resistance in the marine atmosphere, a wide operating temperature titanium alloys, grade 2 titanium alloys at low temperature -253 ℃ but also to maintain good plasticity, and heat-resistant alloy operating temperature up to about 550 ℃, its heat resistance was significantly higher than that of aluminum and magnesium alloys, but also has good workability, weldability.
Titanium and titanium alloy Ti excellent performance since the industrial production on various tech industries much attention, along with the titanium industry started in the mid-1950s, titanium into the automotive industry. Into the 1990s, with the worldwide shortage of energy and people's awareness of environmental protection, especially in the automotive industry, the US, Japan and Europe and other countries have issued a series of ecological regulations, fuel rate, carbon dioxide emissions, vehicle weight, automobile safety, reliability and put forward higher requirements. Many developed countries and the famous car manufacturers are actively developing and increasing the use of Ti in terms of automotive investment, provided a powerful impetus for the car with titanium.
In the current automotive market, with luxury cars, sports cars and racing demand increases every year, Titanium components also increased year by year. 1990 Global Automotive titanium tubing is only about 50 tons / year in 1997 to 500 tons / year in 2002 to 1100 tons / year in 2009 to 3000 tons / year, next year will also maintain double-digit growth Thus, the automotive industry with titanium into accelerated growth phase.

titanium axle Research Investment casting with

Research Investment casting with titanium oxide ceramic shell -shell technology for
Titanium Investment casting technology to meet the needs of the aerospace industry and developed , has been widely used in aerospace titanium titanium components and civilian material titanium structures manufacturing. Practice has proved that the titanium alloy precision casting technology has become almost no margin of several forming processes to obtain maximum effectiveness of a process [ 1-3] . With the extensive application of titanium castings , its increasingly stringent quality and usability requirements , in addition, the level of costs also limit its application prospects is an important indicator . Graphite was low cost but poor quality of the casting surface , and is not suitable for the production of thin-walled complex parts [ 4 ] , but with the surface layer of refractory metal or yttrium oxide surface layer ceramic shell can be cast out of high quality titanium castings, but the cost is very high [ 5,6 ] . For this study the low -cost , suitable for the production of complex thin-walled shell technology for a new type of titanium oxide ceramic Investment casting is .
1 Materials and experimental methods
1.1 The main system shell material
Mold material : the material properties of the selected mode is shown in Table 1. The main use of imported wax wax casting specifically for titanium , gate part is low cost, performance can meet the requirements of homemade wax , respectively, after pressing, welding titanium wire price synthetic wax module.
Table 1 titanium casting mold materials with properties
Table1 Waxes used for making shells
Performance of imported wax homemade wax
Dropping Point / ℃ 69 ~ 71 70.5
Freezing point / ℃ 58 ~ 59 60 ~ 62
Linear shrinkage / % 1.3 0.4 0.6
Penetration / 1/10mm 12 ~ 14 11
Zhao hardness 21.1 19
Tensile strength / MPa 3.69 2.91
Adhesive wetting angle / ° 89 ~ 92 79 ~ 82
Density / g/mm3 0.91 ~ 0.94 0.95 ~ 1
Ash / % < 0.01 0.05
The surface layer and the adjacent surface layer of slurry : The main components of zirconia refractories , size of 30μm or less. Organic zirconium sol as a binder , the size of the refractory rubber match should be 10 ~ 15nm.
The surface layer and the adjacent surface layer of sanding : the main component of the surface layer is made of zirconium dioxide sand , the size of 150 ~ 300μm. To reduce costs, the use of adjacent surface layer is mainly composed of ZrO2.SiO2 zircon sand . The results show that the diffusion of Si is not seen in the casting , it is feasible the use of zircon sand .
Back layer system shell material: silica sol as a binder , using Morley powder and sand as refractories.
1.2 system shell method
The order of addition batter titanium plate suppliers followed binders , refractory powder , trace additives. Minor amounts of additives to improve the stability of the coating role is to improve the wettability of the material and the mold , etc., and to prevent drying of the surface layer after the return water soluble additive is selected micro- organic material can be removed during the calcination . Stir batter than 2h at room temperature ( about 20 ℃) ​​in the air , after the return of 1h to use .

O face the same batter pulp and raw materials , the production process is the same, only slightly smaller concentrations . Slurry feed back order binders , refractory powder. Also need to continuously stirred slurry back more than 2h , after the return of before use. Depending on the size of the backing layer casting , painted hanging normally takes 4-9 layers.

Drying : Drying time the surface layer and the adjacent surface layer are 24h, the temperature is 20 ℃, relative humidity of not less than 60% , the drying time of the backing layer is not less than 4h, the same as other conditions and the surface layer .

Dewaxing process : the use of microwave dewaxing , the equipment used for the large cavity size , 1500W Adjustable microwave intensity.

Roasting process : After dewaxing gas shell fired at without protection roaster .

Optimization of two main titanium rod for sale parameters of the Shell Technology

In all system shell process parameters on shell quality and ultimately a greater impact on the quality of castings are: batter ingredients, namely powder -liquid ratio , dewaxing and roasting process parameters [ 7 ] , this research labs now there are devices on the above parameters in-depth study and optimize selection.