Preparation method of NiCrAlYSi powder spraying material
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A technology for spraying materials and powders, applied in metal material coating process, coating, melt spraying and other directions, can solve problems such as high temperature oxidation and corrosion, achieve good quality, reduce manufacturing costs, and achieve the effect of engineering applications
Inactive Publication Date: 2013-04-17
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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It is difficult for traditional high-temperature alloys to meet this requirement. Surface coating with protective coating
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Embodiment 1
[0034] Put the prepared raw materials into a magnesia crucible and adopt vacuum induction melting. The chemical composition ratio of the raw materials is weight percentage: Cr: 20.0; Al: 9.0; Si: 0.6; Y: 0.5; O: ≤0.050; N : ≤0.020; Ni balance.
[0035] The specific process flow is:
[0036] (1) Prefabricated master alloy: The master alloy is prepared by vacuum induction heating, the raw material is placed in a magnesia crucible, the pre-vacuum degree is higher than 2Pa, the refining temperature is 1410°C±20°C, the refining time is 15min, and casting The temperature is 1440℃±20℃, and after cooling, it is cast into an alloy rod with a diameter of 80mm;
[0037] (2) Composition analysis: carry out composition analysis on the obtained master alloy, and the obtained alloy composition does not exceed the chemical composition ratio of the NiCrAlYSi powder, and directly proceed to step (3);
[0038] (3) Gas atomization powder making: powder materials are prepared by ultrasonic gas a...
Embodiment 2
[0052]The difference from Example 1 is that the atomization temperature is 1530°C, the atomization pressure is 8MPa, and the gas flow rate is 10m 3 / min, the alloy liquid flow rate is 3kg / min.
[0053] The obtained NiCrAlSiY alloy powder is uniform in texture, dry, free of foreign impurities and agglomeration. Its bulk density and fluidity meet the requirements of spraying.
Embodiment 3
[0055] The difference from Example 1 is that the atomization temperature is 1510°C, the atomization pressure is 8MPa, and the gas flow rate is 13m 3 / min, the alloy liquid flow rate is 2kg / min.
[0056] The obtained NiCrAlSiY alloy powder is uniform in texture, dry, free of foreign impurities and agglomeration. Its bulk density and fluidity meet the requirements of spraying.
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Abstract
The invention aims at provides a preparation method of an NiCrAlYSi powder spraying material. The method adopts a technology of 'mother alloy pre-preparation and ultrasonic gas atomization' and a purpose of uniform control for chemical components of powder is achieved. The method comprises the specific steps that (1), a mother alloy is pre-prepared by a vacuum induction heating method; raw materials are placed into a magnesia crucible, with forvacuum degree higher than 2Pa, refining temperature of 1390-1430 DEG C, refining period of 15-20min, and casting temperature of 1420-1460 DEG C; the raw materials are cooled and cast to an alloy bar with a diameter of 70-100mm; (2) component analysis is conducted on the obtained mother alloy; if components of the obtained alloy exceed a proportion of the chemical components of the NiCrAlYSi powder, secondary stock preparation is conducted according to the proportion; (3), gas atomization pulverization is conducted, with atomization temperature of 1500-1530 DEG C, atomization pressure of 8-10MPa, gas flow of 10-15m<3>/min, alloy liquid flow of 2-4kg/min, and an atomization medium of pure argon.
Description
technical field [0001] The invention belongs to the technical field of coating of surface coatings, and in particular provides a preparation method of a nickel-based spraying powder material, which can be widely used in the preparation of surface coatings of similar parts of various engines. Background technique [0002] The development of modern aero-engines requires aero-engines to work at higher temperatures while prolonging their service life, which puts forward higher and higher requirements for the materials of engine hot-end parts. Traditional high-temperature alloys are difficult to meet this requirement, and surface coating with protective coatings is the most effective way to solve the problems of high-temperature oxidation, corrosion and heat resistance of materials. [0003] The low-pressure turbine guide vane material of an engine is a nickel-based intermetallic compound. The material does not contain Ti but contains 1.0~2.0% Hf, and the content of Al+Ta+Cr is h...
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