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A kind of temporary protective coating for titanium alloy heat treatment process and preparation method thereof

A heat treatment process and temporary protection technology, which is applied in the field of inorganic protective coatings, can solve problems such as limited protective effects, and achieve the effects of improving suspension performance, improving high-temperature fluidity, and increasing softening point

Active Publication Date: 2021-07-23
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When some titanium parts need to be heat treated for a long time, the protective effect of the temporary protective coating is limited

Method used

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  • A kind of temporary protective coating for titanium alloy heat treatment process and preparation method thereof
  • A kind of temporary protective coating for titanium alloy heat treatment process and preparation method thereof
  • A kind of temporary protective coating for titanium alloy heat treatment process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the present embodiment, TC4 alloy is substrate, prepares this enamel-based temporary protective coating, and its preparation process is as follows:

[0039] (1) Melting of enamel glaze:

[0040] In terms of mass percentage, the formula of enamel glaze is: 52% silicon dioxide, 3% aluminum oxide, 3% boron trioxide, 6% chromium oxide, 25% barium oxide, 5% strontium oxide, Zirconium 3%, calcium oxide 3%.

[0041] Mix the above oxides by ball milling at a speed of 320 rpm for 2 hours. After mixing evenly, heat and smelt. The smelting process is as follows:

[0042] RT (room temperature)→500°C, heating at a constant speed for 1 hour;

[0043] 500°C→1000°C, heating at an even speed for 30 minutes;

[0044] 1000°C→1650°C, heating at a constant speed for 1 hour;

[0045] Keep the temperature at 1650°C for 1 hour and then water quench to obtain enamel particles.

[0046] (2) Preparation of enamel micropowder: the enamel glaze obtained after water quenching was subjected t...

Embodiment 2

[0059] In this embodiment, Ti60 alloy is the substrate, and the enamel-based temporary protective coating is prepared, and its preparation process is as follows:

[0060] (1) Melting of enamel glaze:

[0061] In terms of mass percentage, the formula of enamel glaze is: 55% silicon dioxide, 2% aluminum oxide, 3% boron trioxide, 4% chromium oxide, 25% barium oxide, 5% strontium oxide, Zirconium 3%, calcium oxide 3%.

[0062] Mix the above oxides by ball milling at a speed of 320 rpm for 2 hours. After mixing evenly, heat and smelt. The smelting process is as follows:

[0063] RT (room temperature)→500°C, heating at a constant speed for 1 hour;

[0064] 500°C→1000°C, heating at an even speed for 30 minutes;

[0065] 1000°C→1650°C, heating at a constant speed for 1 hour;

[0066] After constant temperature of 1650°C for 1.5 hours, water quenching to obtain enamel particles.

[0067] (2) Preparation of enamel micropowder: the enamel glaze obtained after water quenching was sub...

Embodiment 3

[0072] In the present embodiment, TC4 alloy is substrate, prepares this enamel-based temporary protective coating, and its preparation process is as follows:

[0073] (1) Melting of enamel glaze:

[0074] In terms of mass percentage, the formula of enamel glaze is: 50% silicon dioxide, 5% aluminum oxide, 4% boron trioxide, 8% chromium oxide, 22% barium oxide, 5% strontium oxide, Zirconium 4%, calcium oxide 2%.

[0075] Mix the above oxides by ball milling at a speed of 320 rpm for 2 hours. After mixing evenly, heat and smelt. The smelting process is as follows:

[0076] RT (room temperature)→500°C, heating at a constant speed for 1 hour;

[0077] 500°C→1000°C, heating at an even speed for 30 minutes;

[0078] 1000°C→1600°C, heating at a uniform speed for 1 hour;

[0079] After constant temperature at 1600°C for 1.5 hours, water quenching to obtain enamel particles.

[0080] (2) Preparation of enamel micropowder: the enamel glaze obtained after water quenching was subjecte...

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Abstract

The invention relates to an inorganic protective coating technology, in particular to a temporary protective coating used in the heat treatment process of titanium alloys and a preparation method thereof. The coating is an enamel coating system composed of enamel glaze and fillers such as quartz and clay. The enamel glaze is 65-85%, the quartz is 10-20%, and the kaolin is 5-15%. The formula of enamel glaze is: silicon dioxide 50-55%, aluminum oxide 2-5%, boron oxide 2-5%, chromium oxide 4-8%, barium oxide 22-28%, strontium oxide 2-8%, zirconium dioxide 2-5%, calcium oxide 2-5%. The invention selects high temperature stable quartz particles and kaolin clay with good suspension performance and low cost as fillers, and the prepared enamel coating has compact structure, good high temperature stability, adjustable softening point and thermal expansion coefficient, and wide firing temperature range. Coated on the surface of titanium and titanium alloys, it can isolate the oxidizing atmosphere and reduce the oxidation loss during the heat treatment of the alloy, and the coating can be removed by simple sandblasting after heat treatment.

Description

technical field [0001] The invention relates to the technology of inorganic protective coating, and in particular provides a temporary protective coating used in the heat treatment process of titanium alloy and a preparation method thereof. Background technique [0002] Titanium is abundant in the earth and is an important structural metal material developed in the 1950s. Because of its high specific strength, good corrosion resistance, and high heat resistance, titanium alloys have attracted the attention of material researchers all over the world, and their applications in the industrial field have gradually increased. However, at present, more than 70% of titanium is used in the fields of aerospace or national defense, and the application in the field of civil industry is obviously less. The reason is mainly that the process performance of titanium alloy is poor, and cutting is difficult. During thermal processing, it is very easy to absorb impurities such as oxygen, hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/14C22F1/18
CPCC04B35/14C04B35/62222C04B35/66C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3241C04B2235/3244C04B2235/3409C22F1/183
Inventor 陈明辉喻政王群昌周文王福会
Owner NORTHEASTERN UNIV LIAONING
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