Plumbaginous dope for Ti and Ti alloy casting

Abstract

The invention provides a graphite paint used for casting a titanium and a titanium alloy. The key point is that the invention is prepared by the uniform fixing of a fireproof aggregate powder of 28-70wt%, an adhesive of 29-70wt%, a surfactant of 0-2wt% and an antifoam agent of 0-1wt% according to the weight percentage. The fireproof aggregate powder consists of at least one of a yttria powder, a yttrium rare earth oxide powder and a zirconia powder; the granularity of the fireproof material powder is less than 0.053mm; the adhesive is a zirconium acetate solution with the consistency of 30-40wt%; the surfactant is a JFC; the antifoam agent is a normal butanol. The invention has the advantages that: (1) the filling capability of titanium liquid is effectively improved, and the defects such as pouring shortage, cold shut, cracks, etc. which are caused by the chilling of graphite is reduced; (2) the surface finish of casting is obviously improved, (3) the thermal stability is high, the thickness of the pollution layer of the casting is obviously lower than that of the normal machine-made type; (4) the withdrawing capability of the graphite mold in the solidification process can be improved, and the blocking function of the mold can be reduced when the casting is contracted; (5) the mold is easy to be removed.

Description

technical field [0001] The invention relates to a paint, in particular to a graphite-type paint for casting titanium and titanium alloys. Background technique [0002] Titanium alloys have high strength, low density, and good corrosion resistance, making titanium alloy castings widely used in aviation, aerospace, ships, metallurgy, and chemical industries. The design of titanium castings tends to have the characteristics of complex structure, large size, thin wall and uneven wall thickness. The quality requirements of castings are getting higher and higher, which makes the casting technology of titanium castings more and more difficult. At present, single piece, small batch and large complex titanium alloy castings are all produced by graphite-type process. This process uses artificial graphite to make molds. Although the chemical stability of graphite material to titanium liquid is good, the surface roughness of the cast casting is ≥12.5μm, and the thickness of the contam...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above problems, to provide a graphite-type coating for titanium and titanium alloy casting, in the titanium and titanium alloy graphite-type casting process, use the coating to coat the cavity surface of the graphite mold, that is, introduce the coating Technology, the surface roughness of the castings produced is ≤6.3μm, the surface contamination layer is ≤0.05mm, and the titanium castings have no defects such as high-density inclusions, insufficient pouring, surface cold shuts and cracks.