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Infrared permeated alpha-sialon ceramic material and preparation method

A 3si10al2on15, ceramic material technology, applied in the field of infrared-transmitting α-sialon material and its preparation technology, which can solve problems such as quantitative research on light transmittance

Inactive Publication Date: 2007-02-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mandal et al [J EuroCeram Soc 1999 19 2949~2957] prepared Nd 2 o 3 and Yb 2 o 3 Stabilized α-sialon ceramics, but light transmittance was not quantified

Method used

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  • Infrared permeated alpha-sialon ceramic material and preparation method
  • Infrared permeated alpha-sialon ceramic material and preparation method
  • Infrared permeated alpha-sialon ceramic material and preparation method

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Experimental program
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specific Embodiment approach 1

[0011] Embodiment 1: The molecular formula of the infrared-transmitting α-sialon ceramic material in this embodiment is Re m / 3 Si 12-(m+n) Al m+n o n N 16-n , where m=1, 0.5<n<2, Re is a rare earth element (Y, Yb, Dy, Lu and other α-sialon stabilizers).

specific Embodiment approach 2

[0012] Specific implementation mode 2: In this implementation mode, the infrared-transmitting α-sialon ceramic material is prepared according to the following method:

[0013] a. According to the molecular formula Re m / 3 Si 12-(m+n) Al m+n o n N 16-n For α-sialon ingredients, use Si 3 N 4 , AlN, Al 2 o 3 、Re 2 o 3 Powder is the raw material, and the above-mentioned substances are mixed.

[0014] b. The light-transmitting α-sialon material is prepared by a hot-pressing sintering process, and the sintering condition is (1800-1900°C) / (20-40MPa axial pressure) / (30-90min). Before heating up, the furnace chamber is evacuated and filled with N with a purity greater than 99.9%. 2 To one atmospheric pressure, the heating rate is 5-50°C / min.

[0015] c. Carry out high-temperature nitriding treatment on the material, the process is 2.0-4.0MPaN 2Keep warm at 1800-1900°C in the atmosphere. The holding time (unit, min) is proportional to the thickness of the product (unit, mm),...

specific Embodiment approach 3

[0016] Specific embodiment three: this embodiment is different from specific embodiment two in that a sintering aid (Re 2 o 3 ), the amount added is Re m / 3 Si 12-(m+n) Al m+n o n N 16-n 0.1-10% by weight. Adding a small amount of rare earth oxide can promote densification and realize the control of material densification and intergranular phase content.

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Abstract

This invention provides a method for preparing IR-transmitting alpha-sialon ceramic with the molecular formula of Rem / 3Si12-(m+n)Alm+nOnN16-n, wherein m is 1, n is in 0.5-2, and Re is rare earth metal. The alpha-sialon ceramic is prepared from Si3N4, AlN, Al2O3 and Re2O3 powder. The method comprises: (1)c preparing the above raw materials according to the molecular formula; (2) preparing photic alpha-sialon material by hot-pressing sintering; (3) nitrifying at high temperatures, and cooling in the temperature range higher than 1200 deg.C. The alpha-sialon content is adjusted to alpha-beta phase boundary to reduce the content of inter-crystal phase.

Description

technical field [0001] The invention belongs to the technical field of infrared-transmitting ceramic materials, and in particular relates to an infrared-transmitting α-sialon material and a preparation process thereof. Background technique [0002] Since its discovery, sialon has received continuous financial support as a high-temperature structural material with a temperature up to 1500 °C. Among them, self-toughening α-sialon ceramics have the characteristics of easy densification, good chemical stability, wear resistance, and oxidation resistance, as well as excellent mechanical properties at room temperature and high temperature, and have broad application prospects in the fields of aviation and aerospace. [0003] Research has found that sialon ceramics have excellent optical properties [J Mater Res 1996 11(11) 2790-2794; J Mater Sci Lett 1982 1 25-26], and dense samples with a thickness of 0.5-1.0mm can be clearly placed below The text is reflected; Sialon ceramics ad...

Claims

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Application Information

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IPC IPC(8): C04B35/599C04B35/622
Inventor 叶枫刘利盟
Owner HARBIN INST OF TECH