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A kind of cyan silicon nitride ceramics and preparation method thereof

A technology of silicon nitride ceramics and silicon nitride powder, which is applied in the field of cyan silicon nitride ceramics and its preparation, and ceramic preparation, can solve the problems of monotonous color of silicon nitride ceramics and darkening of the color of silicon nitride ceramics, and achieve cost reduction. Low, non-destructive performance, easy to manufacture effects

Active Publication Date: 2021-10-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, affected by additives, impurities and sintering conditions, the color of silicon nitride ceramics is relatively monotonous and mostly gray, and the color of silicon nitride ceramics becomes darker as the formed silicide impurities increase.
Obviously, a single color is difficult to meet people's growing demand for silicon nitride ceramic decorative materials. Therefore, the research and development of colored silicon nitride ceramics has broad market prospects

Method used

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  • A kind of cyan silicon nitride ceramics and preparation method thereof
  • A kind of cyan silicon nitride ceramics and preparation method thereof
  • A kind of cyan silicon nitride ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 61.52g of silicon nitride powder, 3.23g of neodymium oxide colorant, 0.7g of PVB binder and 5.26g of sintering aid magnesium oxide-YAG powder in 140g of absolute ethanol, and the weight ratio of magnesium oxide and YAG phosphor is 1:6. After ball milling on a planetary ball mill at a speed of 380r / min for 3 hours, the suspension was poured out, and after drying to remove alcohol, the ceramic powder was ground and passed through a 100-mesh sieve, and prepared into 50×50×5mm by isostatic pressing. Ceramic bodies. Under vacuum, heat up to 900°C at a rate of 3°C / min and hold for 1 hour to complete debonding. After slow debonding, in a carbon tube furnace, heat at a rate of 5°C / min to 1800°C, and hold in a nitrogen atmosphere for 2 hours to achieve sintering . Can get dense, uniform color cyan silicon nitride ceramic sheet;

[0041] The density of the sintered cyan silicon nitride ceramic sheet measured by the Archimedes drainage method is 97.71%. The thermal conduct...

Embodiment 2

[0043] Add 60.99g of silicon nitride powder, 3.11g of neodymium oxide colorant, 0.7g of PVB binder and 5.89g of sintering aid magnesium oxide-YAG powder in 140g of absolute ethanol, and the weight ratio of magnesium oxide and YAG powder is 1 :8. After ball milling on a planetary ball mill at a speed of 380r / min for 3 hours, the suspension was poured out, and after drying to remove alcohol, the ceramic powder was ground and passed through a 100-mesh sieve, and prepared into 50×50×5mm by isostatic pressing. Ceramic bodies. Under vacuum, heat up to 900°C at a rate of 3°C / min and hold for 1 hour to complete debonding. After slow debonding, in a carbon tube furnace, heat at a rate of 5°C / min to 1800°C. In a nitrogen atmosphere, hold for 2 hours. sintering. Can get dense, uniform color cyan silicon nitride ceramic sheet;

[0044] The density of the sintered cyan silicon nitride ceramic sheet measured by the Archimedes drainage method is 97.15%. The thermal conductivity of silico...

Embodiment 3

[0046] Add 65.60g of silicon nitride powder, 3.38g of neodymium oxide colorant, 0.7g of PVB binder and 1.01g of sintering aid magnesium oxide into 140g of absolute ethanol. After ball milling on a planetary ball mill at a speed of 380r / min for 3 hours, the suspension was poured out, and after drying to remove alcohol, the ceramic powder was ground and passed through a 100-mesh sieve, and prepared into 50×50×5mm by isostatic pressing. Ceramic bodies. Under vacuum, heat up to 900°C at a rate of 3°C / min and hold for 1 hour to complete debonding. After slow debonding, in a carbon tube furnace, heat at a rate of 5°C / min to 1800°C, and hold in a nitrogen atmosphere for 2 hours to achieve sintering . Can get dense, uniform color cyan silicon nitride ceramic sheet;

[0047] The density of the sintered cyan silicon nitride ceramic sheet measured by the Archimedes drainage method is 98.12%. The thermal conductivity of silicon nitride ceramics measured by laser thermal conductivity me...

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Abstract

The invention relates to a cyan silicon nitride ceramic and a preparation method thereof. The preparation method comprises: using silicon nitride powder or / and silicon powder as a raw material powder, adding sintering aids and colorants and mixing to obtain Mixed powder, the sintering aid is selected from Al 2 o 3 , AlN, CaO, MgO, Y 2 o 3 , YAG, Ce 2 o 3 , Y 2 o 3 : Ce 3+ At least one of them, the coloring agent is an oxide of rare earth metal neodymium; the obtained mixed powder is mixed with a binder, and then pressed to obtain a ceramic body; after vacuum debinding of the obtained ceramic body, the Sintering is carried out to obtain the cyan silicon nitride ceramics.

Description

technical field [0001] The invention relates to a cyan silicon nitride ceramic and its preparation method and application, belonging to the technical field of ceramic preparation methods. Background technique [0002] Silicon nitride ceramics are a traditional structural ceramic material. It has excellent properties such as high strength, high toughness, impact resistance and thermal shock resistance, and low dielectric loss, and is widely used in various fields, such as cutting tools, molds, refractory materials, valves, etc. In recent years, with the continuous improvement of people's requirements for decorations, colored silicon nitride ceramics can be widely used in high-end watches by virtue of its excellent mechanical properties, bright and elegant colors, metallic luster, environmental friendliness, non-toxic and non-allergic characteristics. Cases, watch chains, high-end buttons, mobile phone casings, etc. It is particularly noteworthy that silicon nitride ceramics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/587C04B35/622C04B35/64
CPCC04B35/587C04B35/622C04B35/64C04B2235/3206C04B2235/3222C04B2235/3224C04B2235/3225C04B2235/428C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/658C04B2235/668C04B2235/96C04B2235/9607C04B2235/9661
Inventor 张景贤刘宁段于森马瑞欣
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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