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Fabrication of ZrO2-Bearing lithium-silicate glass-ceramics by pressureless sintering and spark plasma sintering.
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2020-02-19 , DOI: 10.1016/j.jmbbm.2020.103709
M Ghayebloo 1 , P Alizadeh 1 , R M Melo 2
Affiliation  

Objective

the present study evaluated the effect of the Spark Plasma Sintering (SPS) and Pressureless Sintering (PLS) methods on the physical and mechanical properties of ZrO2-bearing Lithium Silicate (ZLS) glass-ceramics.

Method

SPS and PLS methods were used for fabricating of the zirconia-bearing Lithium Silicate glass-ceramics. Several sintering temperatures were applied in order to achieving the best mechanical and physical properties in both methods. For this purpose, the particle size measurement of the glass powder was performed. Field Emission Scanning Electron Microscope (FESEM) was carried out for evaluation of the microstructure. X-ray diffraction (XRD) was used to investigate the amorphous or crystalline state of the samples. Fourier Transform Infrared Spectroscopy (FTIR) was used for the investigation of the chemical bonds. Flexural strength, Vickers microhardness, fracture toughness, and physical properties such as bulk density, water absorption, and the apparent porosity of the samples were measured.

Results

It is possible to fabricate ZLS glass-ceramics by the SPS method at a sintering temperature approximately 350 °C lower than the sintering temperature of the PLS method. Results of the SPS showed SGC, 550 °C (SPS Glass Ceramic sintered at 550 °C) had the highest flexural strength (255.10 ± 15.44 MPa), fracture toughness (3.15 ± 0.62 MPam1/2), Vickers microhardness (7.96 ± 0.13 GPa) and bulk density (2.63 ± 0.02 g/cm3); the lowest water absorption (0.11 ± 0.12) and, apparent porosity (0.25 ± 0.32). Results of the PLS showed PLGC, 900 °C (PLS Glass Ceramic sintered at 900 °C) had the flexural strength (160.27 ± 12.69 MPa), the highest Vickers microhardness (7.22 ± 0.67 GPa) and bulk density (2.53 ± 0.03 g/cm3); the lowest water absorption (0.15 ± 0.21) and, apparent porosity (0.39 ± 0.54). According to the XRD patterns and FESEM images, SGC, 550 °C has Li2Si2O5 spherical nanocrystals (approximately 50–100 nm diameters).

Significance

Different sintering temperatures in the SPS and PLS methods have an obvious effect on the microstructure, mechanical, and physical properties of ZrO2-bearing Lithium Silicate (ZLS) glass-ceramics. Sintering temperature was decreased in SPS compared to the PLS method and nanocrystals of Li2Si2O5 formed.



中文翻译:

通过无压烧结和火花等离子体烧结制备含ZrO2的硅酸锂玻璃陶瓷。

目的

本研究评估了火花等离子烧结(SPS)和无压烧结(PLS)方法对含ZrO 2的硅酸锂(ZLS)玻璃陶瓷的物理和机械性能的影响。

方法

SPS和PLS方法用于制造含氧化锆的硅酸锂玻璃陶瓷。为了在两种方法中获得最佳的机械和物理性能,均采用了几种烧结温度。为此目的,进行玻璃粉末的粒度测量。进行场发射扫描电子显微镜(FESEM)以评价其微观结构。X射线衍射(XRD)用于研究样品的非晶态或结晶态。傅里叶变换红外光谱(FTIR)用于研究化学键。测量样品的挠曲强度,维氏显微硬度,断裂韧性以及诸如堆积密度,吸水率和表观孔隙率的物理性质。

结果

通过SPS法可以在比PLS法的烧结温度低约350℃的烧结温度下制造ZLS玻璃陶瓷。SPS结果表明,550°C(在550°C烧结的SPS玻璃陶瓷)的SGC具有最高的弯曲强度(255.10±15.44 MPa),断裂韧性(3.15±0.62 MPam 1/2),维氏显微硬度(7.96±0.13) GPa)和堆积密度(2.63±0.02 g / cm 3);最低吸水率(0.11±0.12)和表观孔隙率(0.25±0.32)。PLS的结果表明,900°C的PLGC(900°C烧结的PLS玻璃陶瓷)的弯曲强度(160.27±12.69 MPa),维氏显微硬度最高(7.22±0.67 GPa)和堆积密度(2.53±0.03 g /厘米3); 最低吸水率(0.15±0.21),表观孔隙率(0.39±0.54)。根据XRD图和FESEM图像,SGC在550°C时具有Li 2 Si 2 O 5球形纳米晶体(直径约50–100 nm)。

意义

SPS和PLS方法中不同的烧结温度对含ZrO 2的硅酸锂(ZLS)玻璃陶瓷的微观结构,机械和物理性能有明显影响。与PLS方法相比,SPS降低了烧结温度,并形成了Li 2 Si 2 O 5纳米晶体。

更新日期:2020-02-19
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