Modified composition of binder for titanium alloy investment casting and application thereof

Abstract

The invention discloses a modified composition of an adhesive for titanium alloy investment casting and its application, including a viscosity reducer and a film aid, the viscosity reducer includes a derivative of soluble polycarboxylic acid; the aid The film contains at least one of diisopropanol adipate, low molecular weight polyvinyl alcohol or 2,2,4-trimethyl 1,3-pentanediol monoisobutyrate, and the viscosity reducer The mass ratio of film aid and film aid is 1: (2.5-4). Through the modified composition of the present invention, the performance of the modified adhesive is stabilized, and then the powder-to-liquid ratio of the surface layer slurry is improved, and the shortcomings of the surface layer coating such as thinner and poorer density are improved, thereby Significantly improves the strength and quality of the finish.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a modified composition of an adhesive for titanium alloy investment casting and an application thereof. Background technique [0002] Titanium alloy is an excellent structural material with a series of excellent properties such as low density, high specific strength, corrosion resistance, and good biocompatibility. It is widely used in aerospace, ocean transportation, energy, chemical industry, medical care, etc. industry. Titanium alloy castings have their own unique advantages, especially in the process of investment precision casting, the shape can be arbitrarily complex, and it can be formed as a whole with almost no margin or even no margin. However, because titanium is an extremely active chemical element, liquid titanium has chemical reactions with almost all molding materials to varying degrees. These reactions can increase the brittleness of titaniu...

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Problems solved by technology

However pure ZrO 2 A phase transition will occur at about 1000°C, from monoclinic to tetragonal, and a volume change of about 9% will occur at the same time. When applied in the field of titanium alloy investment precision casting, the strength of the surface layer will be insufficient, causing the shell surface Peeling and exfoliation of layers

In addition, both zirconium sol and yttrium sol have the disadvantages of low powder-liquid ratio, thin surface coating and poor density when preparing surface layer slurry.

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