A kind of chemical milling paste for precision casting of single crystal superalloy and its preparation method and application

Abstract

A chemical milling paste for single crystal high-temperature alloy precision castings and its preparation method and application, belonging to the field of surface milling technology. The single crystal high temperature alloy precision casting milling paste is a mixture of mixed aqueous solution and orthosilicate compounds. According to the volume ratio, mixed aqueous solution: orthosilicate compound = 1: (2~5); mixed aqueous solution: sulfuric acid is 9~18mol·L ‑1 ,FeCl 3 is 0.3~2.0mol·L ‑1 ,MnO 2 3.0~10.0g·L ‑1 . The preparation method is to prepare a mixed aqueous solution, add orthosilicate compounds and stir for 1 to 2 hours. It performs chemical milling on single crystal high temperature alloy precision castings and test pieces, and is especially suitable for chemical milling on the local surface of single crystal high temperature alloy precision castings. This single crystal high-temperature alloy precision casting milling paste has low volatility, good milling effect, and is relatively environmentally friendly. It is mainly used to remove the residual stress concentration layer caused by plastic deformation on the local surface of single crystal high-temperature alloy precision castings during the casting process. Effectively reduce recrystallization defects during subsequent heat treatment.

Description

technical field [0001] The invention relates to the technical field of surface chemical milling, in particular to a chemical milling paste for precision castings of single crystal superalloys and its preparation method and application. Background technique [0002] Nickel-based superalloy is a high-temperature structural material based on nickel, which has high room temperature strength and high temperature strength, excellent creep and fatigue resistance, good oxidation resistance and thermal corrosion resistance, good structural stability and Use reliability. Nickel-based superalloys are mainly used to manufacture the hottest parts of aviation jet engines and various industrial gas turbines, such as guide blades, working blades, turbine disks, etc. of the turbine part. It is also an irreplaceable material for high-temperature hot-end parts of rocket engines and gas turbines. [0003] In the past two decades, nickel-based superalloys have gone through several stages such ...

AI Technical Summary

Problems solved by technology

Among these chemical milling methods, hydrochloric acid is a very volatile acid, hydrofluoric acid is a very serious acid to the environment and human body, and under the condition of strong oxidizing acid, chromic anhydride will become a carcinogen, which is extremely harmful to the human body.