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Preparation method of hot bending mold for normal pressure sintering of hexagonal boron nitride ceramic curved glass

A technology of hexagonal boron nitride and normal pressure sintering, which is applied in glass manufacturing equipment, glass molding, glass re-molding, etc., can solve problems such as the application of BN ceramics that have not yet been seen

Inactive Publication Date: 2018-07-20
苏州纳朴材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, BN ceramics have not been used in curved glass hot bending molds.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0024] Specific embodiment one, the manufacturing method of normal pressure sintered hexagonal boron nitride ceramic curved surface glass hot bending mold, its steps are:

[0025] (1) Raw material pretreatment, the BN powder is treated in an air atmosphere and at a temperature of 1200°C for 1 hour before use;

[0026] (2) Preparation of mixed powder, by weight ratio Al 2 o 3 : Y 2 o 3 =1.5 ratio to weigh Al 2 o 3 and Y 2 o 3 10 grams of powder, mixed evenly, recorded as AY powder, as a sintering aid; 90 grams of BN powder prepared in step (1) and AY powder were mixed evenly to prepare a mixed powder;

[0027] (3) Prepare the slurry, use water as the solvent, PVA as the binder, and the binder is 1 gram, and use the mixed powder and the binder as the solute to prepare a slurry with a solid content of 45wt% (weight percentage) ; followed by Al 2 o 3 The ball is used as a grinding ball to mix the slurry evenly;

[0028] (4), powder preparation, the slurry prepared in s...

specific Embodiment 2

[0034] Specific embodiment two, the manufacturing method of normal pressure sintered hexagonal boron nitride ceramic curved surface glass hot bending mold, its steps are:

[0035](1) Raw material pretreatment, the BN powder is treated in an air atmosphere and at a temperature of 1250°C for 1.2 hours before use;

[0036] (2) Preparation of mixed powder, by weight ratio Al 2 o 3 : Y 2 o 3 =1 ratio to weigh Al 2 o 3 and Y 2 o 3 5 grams of powder, and mixed evenly, recorded as AY powder, as a sintering aid; 95 grams of BN powder prepared in step (1) and AY powder were evenly mixed to prepare a mixed powder;

[0037] (3) Prepare the slurry, use alcohol as the solvent, PVB as the binder, the amount of the binder is 2 grams, and use the mixed powder and the binder as the solute to prepare a slurry with a solid content of 45wt% (weight percentage) material; followed by Al 2 o 3 The ball is used as a grinding ball to mix the slurry evenly;

[0038] (4) Preparation of powder...

specific Embodiment 3

[0044] Specific embodiment three, the manufacturing method of normal pressure sintered hexagonal boron nitride ceramic curved surface glass hot bending mold, its steps are:

[0045] (1) Raw material pretreatment, the BN powder is treated in an air atmosphere and at a temperature of 1200°C for 1 hour before use;

[0046] (2) Preparation of mixed powder, by weight ratio Al 2 o 3 : Y 2 o 3 =1 ratio to weigh Al 2 o 3 and Y 2 o 3 2 grams of powder, and mixed evenly, recorded as AY powder, as a sintering aid; 98 grams of BN powder prepared in step (1) and AY powder were evenly mixed to prepare a mixed powder;

[0047] (3) Prepare the slurry, use alcohol as the solvent, PVB as the binder, use 2 grams of the binder, and use the mixed powder and the binder as the solute to prepare a slurry with a solid content of 45wt% (weight percentage) ; followed by Al 2 o 3 The ball is used as a grinding ball to mix the slurry evenly;

[0048] (4) Preparation of powder, spraying and gra...

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Abstract

The invention relates to a preparation method of a hot bending mold for normal pressure sintering of hexagonal boron nitride ceramic curved glass and belongs to the technical field of boron nitride ceramic molds. Aiming to solve the problem that a hot bending mold for manufacturing curved glass by adopting graphite in the prior art cannot resistant to oxidative erosion, the invention provides a hot bending mold for manufacturing h-BN ceramic curved glass with a normal pressure sintering method by taking commercial BN powder as a raw material. The BN ceramic has high thermal conductivity and low thermal expansion coefficient, has non-wetting property and workability with glass, has better high-temperature oxidation resistance than a graphite material, is oxidized in the air at the high temperature of 1200 DEG C or above, and has lower hot bending temperature than glass with the softening point of 800 DEG C. Furthermore, the preparation method of the hot bending mold for normal pressuresintering of the hexagonal boron nitride ceramic curved glass is simple in process and lower in cost, can realize industrialized large-scale production and is suitable for being popularized and used.

Description

technical field [0001] The invention relates to a method for manufacturing a curved glass hot-bending mold for sintering hexagonal boron nitride ceramics under normal pressure, and belongs to the field of boron nitride ceramic molds. Background technique [0002] Hexagonal boron nitride (h-BN) is called "white graphite" because it has a layered crystal structure similar to graphite, and also has similar physical and chemical properties to graphite, such as good lubricity and thermal conductivity. Because of its high thermal conductivity, good electrical insulation performance, low thermal expansion coefficient, and non-wetting properties with most metals, h-BN structural ceramics have been widely used in high-temperature insulation components, atomic energy, metallurgy, aviation and other fields. Utilizing the high temperature resistance and electrical insulation of boron nitride, h-BN products can be used to make high-temperature insulating parts for plasma welding tools, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5833C04B35/622C03B23/023
CPCC03B23/023C04B35/583C04B35/622C04B2235/3217C04B2235/3225C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96C04B2235/9607
Inventor 徐常明陈健
Owner 苏州纳朴材料科技有限公司