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A kind of anti-adhesive coating on the surface of cemented carbide sintered boat and its preparation method

An anti-stick coating, cemented carbide technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem that the service life cannot meet the industrial production and other problems

Active Publication Date: 2021-03-16
INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the deficiencies of artificial brush coating, researchers began to try to use plasma spraying technology to spray a layer of anti-sticking material on the surface of the boat, such as the Chinese patent that the publication number is CN 102744404A discloses spraying an anti-sticking coating on the surface of the boat, but The sintering times of the coating are only about 10 times, and the service life cannot meet the needs of industrial production.

Method used

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preparation example Construction

[0032] The present invention also provides a preparation method of the anti-sticking coating described in the above technical solution, comprising the following steps:

[0033] Preheating the cemented carbide sintered boat to obtain a preheated sintered boat;

[0034] The surface of the preheated sintered boat is sequentially sprayed with an intermediate transition coating and a working surface layer to obtain the anti-adhesive coating.

[0035] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0036] The invention preheats the cemented carbide sintered boat to obtain the preheated sintered boat. In the present invention, before the preheating, the cemented carbide sintered boat is preferably cleaned and roughened by sandblasting. In the present invention, the cleaning is preferably sequentially cleaning the sintered boat with alcohol and acetone. In the present inv...

Embodiment 1

[0043] The sintering boat selects a flat graphite boat for sintering of hard alloy numerical control blades;

[0044] After cleaning the sintered boat with alcohol and acetone in sequence, the surface of the sintered boat was sandblasted and roughened at a sandblasting pressure of 0.3 MPa by using a special sandblasting machine with 60 mesh white corundum grains;

[0045] Fix the sintered boat after sandblasting and roughening treatment on the workbench, use plasma flame to preheat the sintered boat, and control the preheating temperature to 160±10°C;

[0046] The aluminum oxide intermediate transition coating is prepared by plasma spraying technology. The spraying process parameters of the coating are: the main gas for spraying is argon, and the auxiliary gas for spraying is hydrogen; the flow rate of argon gas: 2.0m 3 / h, hydrogen flow rate 0.3m 3 / h, current: 780A, powder feeding rate: 40g / min, spraying distance: 100mm; during the spraying process, compressed air is used t...

Embodiment 2

[0050] Described sintering boat selects the slotted graphite boat for sintering of cemented carbide rods;

[0051] After the sintered boat was cleaned with alcohol and acetone in sequence, the surface of the sintered boat was sandblasted and roughened at a sandblasting pressure of 0.2 MPa using a special sandblasting machine with 100 mesh white corundum sand grains;

[0052] Fix the sintered boat after sandblasting and roughening treatment on the workbench, use plasma flame to preheat the sintered boat, and control the preheating temperature to 160±10°C;

[0053] The silicon carbide intermediate transition coating is prepared by plasma spraying technology. The spraying process parameters of the coating are: the main gas for spraying is argon, and the auxiliary gas for spraying is hydrogen; argon flow rate: 3.5m 3 / h, hydrogen flow rate: 0.3m 3 / h, current: 880A, powder feeding rate: 30g / min, spraying distance: 80mm; during the spraying process, compressed air is used to cool ...

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Abstract

The invention relates to the technical field of sintering boat coatings, in particular to an anti-sticking coating on the surface of a cemented carbide sintering boat and a preparation method thereof.The anti-sticking coating on the surface of the cemented carbide sintering boat comprises an intermediate transition coating and a working surface layer; the intermediate transition coating is an aluminum oxide coating or a silicon carbide coating; the working surface layer is a zirconium oxide layer; and the zirconium oxide layer is doped with a rare earth oxide. With the anti-sticking coating,the sintering boat can be repeatedly used 40 times or more.

Description

technical field [0001] The invention relates to the technical field of sintered boat coatings, in particular to an anti-adhesive coating on the surface of a cemented carbide sintered boat and a preparation method thereof. Background technique [0002] Cemented carbide has a series of excellent properties such as high hardness, high strength, high wear resistance, good thermal stability and red hardness. It is widely used in the manufacture of cutting tools, mining tools and wear-resistant parts. It has the status of "industrial teeth". reputation. The main production process of cemented carbide includes the preparation of raw materials - compact forming - sintering. The sintering process refers to placing the cemented carbide compact on a graphite boat to form a high-density cemented carbide product through a high-temperature reaction at 1350-1550 °C. This process plays a vital role in product quality and pass rate. Due to the good wettability of the binder phase (cobalt,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/11
CPCC23C4/10C23C4/11C23C4/134
Inventor 张林伟余玖明邱伊健谢仕芳王日昕曾卫军杨学兵
Owner INST OF APPLIED PHYSICS JIANGXI ACADEMY OF SCI
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