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Neutron diffraction measure method for CaO-Al2O3-SiO2 system microcrystalline glass residue stress

A technique of cao-al2o3-sio2, 1.cao-al2o3-sio2, applied in measurement devices, material analysis using wave/particle radiation, preparation of test samples, etc., can solve problems such as low radiation and weak penetrating ability question

Inactive Publication Date: 2006-09-06
WUHAN UNIV OF TECH
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Problems solved by technology

However, the energy of the rays is low, and the penetrating ability is very weak. It is found that the thickness of the stress layer is generally about 10 microns.

Method used

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  • Neutron diffraction measure method for CaO-Al2O3-SiO2 system microcrystalline glass residue stress
  • Neutron diffraction measure method for CaO-Al2O3-SiO2 system microcrystalline glass residue stress

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: prepare CaO-Al by the aforementioned method 2 o 3 -SiO 2 System glass-ceramic.

[0028]Put the dried glass frit into the prepared mold and put it into a high-temperature experimental furnace to raise the temperature from room temperature to 1120 °C at a rate of 3 °C / min, and keep it warm for 2 hours to make the glass particles crystallize and flatten, and then cool to room temperature after annealing , A glass-ceramic sample of 20 mm x 20 mm x 8 mm was prepared. The sample is divided into two pieces: the surface of one sample is ground and polished, and the surface of the other sample remains in the original state of automatic flattening. The neutron diffraction measurements were carried out on a two-axis neutron powder diffractometer next to the Heavy Water Research Reactor of the China Institute of Atomic Energy. The wavelength of incident neutrons is 0.1159 nanometers, the scattering angle is 25°-105°, and the step distance is 0.1°. The diffraction ...

Embodiment 2

[0031] Embodiment 2: prepare CaO-Al by the aforementioned method 2 o 3 -SiO 2 System glass-ceramic.

[0032] Put the dried glass frit into the prepared mold and put it into a high-temperature experimental furnace to raise the temperature from room temperature to 1120°C at a rate of 3°C / min, and keep it warm for 2 hours to make the glass particles crystallize and flatten, and set different annealing rates . Specimens with different annealing regimes were prepared for stress testing. The crystal plane constant under the stress state is tested, and the micro-strain in each axial direction is calculated, and the average strain result is obtained as follows: ϵ ‾ = 1 3 ( ϵ 11 + ϵ 22 + ϵ 33 ) . The ...

Embodiment 3

[0033] Embodiment 3: prepare CaO-Al by the aforementioned method 2 o 3 -SiO 2 System glass-ceramic. Changing CaO and Al of glass-ceramics 2 o 3 Glass-ceramic samples of different oxides were prepared. The crystal plane constant under the stress state is tested, and the micro-strain in each axial direction is calculated, and the average strain result is obtained as follows: ϵ ‾ = 1 3 ( ϵ 11 + ϵ 22 + ϵ 33 ) . The corresponding volume average strain is Δ = 1 V ∫ V ϵ ‾ dV , Substitute into the stress formula σ = ...

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Abstract

Wherein, first preparing the glass-ceramic; adjusting the neutron monochromator to select opposite monochromatic neutron; irradiating sample surface with neutron beam with diffraction angle 2theta as 10-75Deg; taking strain detection crystal face with principal crystalline phase as beta-wollastonite and obtaining the average strain result as: ªŠ=1 / 3(ªŠ11+ªŠ22+ªŠ33), opposite volume mean strain as í¸=1 / V(íʪŠdV); calculating with formulaªÊ=E / 3(1-2ªÈ)í¸ (wherein, E: Young's modulus; ªÈ: Poisson's ratio), and then obtaining the total strain on three axial directions ªñ=ea+eb+ec; exactly, here, selecting E=70GPa and ªÈ=0.245; repeating former steps to obtain different residual strain values to draw distribution curve. This invention can obtain the inner strain of sample and fit to massive sample.

Description

technical field [0001] The invention relates to a method for measuring the residual stress of glass-ceramics by neutron diffraction, in particular to CaO-Al 2 o 3 -SiO 2 Systematic glass-ceramic sample surface residual stress neutron diffraction measurement method. Background technique [0002] In recent years, architectural decorative glass-ceramic has been adopted at home and abroad, that is, β-wollastonite is the main crystal phase (see figure 1 ) glass-ceramics (CaO-Al 2 o 3 -SiO 2 There are many research reports on the system), among which the precipitation process of wollastonite crystals has been studied in depth. No matter from the discussion of the crystallization mechanism, or from the research on the factors affecting the composition and process, as well as the research on the mechanical properties of glass-ceramics by the degree of crystallization has penetrated to a certain depth. With CaO-Al 2 o 3 -SiO 2 In the development of the system glass-ceramic ...

Claims

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Application Information

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IPC IPC(8): G01N23/207G01N1/28G06F19/00
Inventor 程金树谢俊何峰汤李缨李宏全健
Owner WUHAN UNIV OF TECH
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