Titanium alloy casting ingot surface glass coating and preparing method thereof

A technology of surface glass and glass coating, which is applied to the device and coating of the surface coating liquid to improve the high temperature stability, solve the effect of anti-oxidation and forging cracking, and improve the coefficient of thermal expansion

Active Publication Date: 2020-02-04
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glass coating improves the viscosity and softening temperature of the glass matrix through the design and control of the composition and composition of the raw glass matrix, thereby improving the service temperature and high temperature stability of the glass coating and the bonding performance with the titanium alloy ingot. A continuous, complete and smooth glass coating with excellent high temperature protection properties is formed on the surface of titanium alloy ingots, which solves the problems of surface oxidation resistance and forging cracking of titanium alloy ingots

Method used

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  • Titanium alloy casting ingot surface glass coating and preparing method thereof
  • Titanium alloy casting ingot surface glass coating and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The glass coating on the surface of the TC17 titanium alloy ingot of this embodiment is prepared from the following raw materials in mass percentages: 65% of glass matrix, 5% of clay, 30% of aluminum oxide and silicon oxide with a particle size of less than 5 μm; the clay is Calcined kaolin of grade 3 or above;

[0031] The glass matrix is ​​prepared by smelting raw materials with the following mass percentages: B 2 o 3 5%, Al 2 o 3 4%, ZrO 2 8%, Cr 2 o 3 9%, CaO 11%, KNO 3 5%, the balance is SiO 2 ; The preparation process of the glass matrix is: the B 2 o 3 、Al 2 o 3 , ZrO 2 、Cr 2 o 3 , CaO, KNO 3 and SiO 2 Put it in a ball mill and mix it evenly, then melt it at 1450°C for 4 hours, quench it with water to get the glass glaze slag and dry it, then use a ball mill to mill it at a speed of 500r / min for 100 hours to get a particle size smaller than 10μm glass powder.

[0032] The additives in the glass coating preparation raw materials in this embod...

Embodiment 2

[0041] The glass coating on the surface of the TC4 titanium alloy ingot of the present embodiment is prepared from the raw materials of the following mass percentages: glass matrix 65%, water glass 35%; the water glass is potassium silicate with a modulus of 3.5 and a mass concentration of 43%. water glass;

[0042] The glass matrix is ​​prepared by smelting raw materials with the following mass percentages: B 2 o 3 12%, Al 2 o 3 20%, ZrO 2 8%, NiO 3%, BaO 3%, Na 2 CO 3 8%, the balance is SiO 2 ; The preparation process of the glass matrix is: the B 2 o 3 、Al 2 o 3 , ZrO 2 , NiO, BaO, Na 2 CO 3 and SiO 2 Put it in a ball mill and mix it evenly, then smelt it at 1600°C for 10 hours, quench it with water to get the glass glaze slag and dry it, then use a ball mill to mill it at a speed of 500r / min for 100 hours to get a particle size smaller than 10μm glass powder.

[0043] The preparation method of the TC4 titanium alloy ingot surface glass coating of the pr...

Embodiment 3

[0049] The difference between this embodiment and Example 2 is that the composite slurry obtained in step 2 is pre-placed on the cleaned TC4 titanium alloy ingot surface in step 1 by means of pneumatic spraying, and the spraying air pressure of the pneumatic spraying is It is 0.4MPa, and the spraying distance is 40cm.

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Abstract

The invention discloses a titanium alloy casting ingot surface glass coating. The glass coating is manufactured through the following raw materials including, by mass, 65%-95% of a glass matrix, 5%-35% of a bonding agent and 0%-30% of an additive. The glass matrix is manufactured through the following raw materials including, by mass, 5%-12% of B2O3, 4%-20% of Al2O3, 3%-8% of ZrO2, 3%-9% of NiO and/or Cr2O3, 3%-11% of CaO and/or BaO, 5%-15% of a compound N and the balance SiO2. The invention further discloses a preparing method of the titanium alloy casting ingot surface glass coating, the rawmaterials are evenly mixed and put on the surface of a titanium alloy casting ingot in advance, and the glass coating is formed through heat treatment. The composition of the glass matrix is regulated, and the glass coating can have good high-temperature protection performance; and the technology is simple and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of high-temperature protection and thermal processing of titanium alloys, and in particular relates to a glass coating on the surface of a titanium alloy ingot and a preparation method thereof. Background technique [0002] In order to change the casting structure of the titanium alloy ingot and obtain the billet of the necessary size, the ingot is generally opened by forging. However, titanium alloy ingots have high temperature oxidation resistance problems during thermal processing. During thermal processing, the ingot must first be heated to 950°C to 1100°C and kept for more than 5 hours. Due to the high affinity between titanium and oxygen and the high solubility of oxygen (atomic fraction can reach 34%), under high temperature oxidation conditions, oxygen-dissolved embrittlement and surface oxidation of titanium alloys will inevitably occur, resulting in porosity on the surface of the ingot. The oxide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D7/24C03C6/00
CPCB05D7/14B05D7/24B05D2202/35C03C1/00
Inventor 汪欣李争显杨涛李晴宇严鹏马秀芬
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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