Preparation and strengthening mechanism of prestressed ceramic tile components

Self Cite

Zirconia toughened alumina (ZTA) has a wide range of applications in high temperature. Though some routes were reported to enhance the mechanical properties at room temperature, the preparation of ZTA with improved high temperature properties was still unknown. In this work, cordierite/ZTA pre‐stressed ceramics (marked as Cor‐ZTA30) have been fabricated successfully by using prestressed coating reinforcement method. The relationships among the temperature, residual stress and the flexural strength of Cor‐ZTA30 have been established based on experimental data. Due to the compressive stresses exists in the surface layer of Cor‐ZTA30 hinder the crack extension, the flexural strength of Cor‐ZTA30 was greatly enhanced at the temperatures below 1000°C. In addition, the difference in flexural strength between coated and uncoated ZTA ceramics decreased with increasing temperature until 1000°C. It indicated that the residual stress vanished entirely as the temperature above 1000°C, which resulted in the same flexural strength for ZTA and Cor‐ZTA30. Therefore, strengthening ZTA ceramics by prestressing is available under the temperatures below 1000°C.

Section: Introductionmentioning

confidence: 99%

Enhanced high temperature properties of ZTA prestressed ceramics reinforced by cordierite coating

Li,

Wu,

Han

et al. 2023

Self Cite

“…7,8 Whisker enhancement and dispersion enhancement have been mainly used in the fields of advanced and traditional porcelain, whereas pre-stress reinforcement has commonly been applied in the fields of glass and concrete; however, in recent years, prestress reinforcement has become more widely used in the field of porcelain. [9][10][11] Prestress enhancement refers to the introduction of a compressive stress into a material or component to offset the applied tensile stress load, thereby increasing the strain of the matrix cracked by tension, and improving the fracture strength, reliability and durability of the material. Prestress enhancement can be categorized as internal and surface reinforcement.…”

Section: Introductionmentioning

confidence: 99%

“…At present, many methods have been used to overcome the brittleness issue and strengthen porcelain products, such as whisker enhancement, 2–4 dispersion enhancement, 5,6 and prestress enhancement 7,8 . Whisker enhancement and dispersion enhancement have been mainly used in the fields of advanced and traditional porcelain, whereas prestress reinforcement has commonly been applied in the fields of glass and concrete; however, in recent years, prestress reinforcement has become more widely used in the field of porcelain 9–11 …”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and strengthening mechanism of SiC particle reinforced porcelain

Zhou,

Li,

Sun

et al. 2023

Self Cite

Mechanical properties of porcelain based on feldspar porcelain as a matrix with SiC particles as a reinforcing phase were studied in terms of the effects of SiC content, firing temperature, and holding time. A maximum flexural strength of 122 ± 4 MPa was achieved for a sample with 8 wt% SiC content treated at 1260°C for 30 min, which is 90.6% as high as than that of the unmodified matrix (64 ± 5 MPa). The fracture toughness and elastic modulus of the former sample were 1.71 MPa · m1/2 and 89.975 GPa, respectively. Because the thermal expansion coefficient of SiC (4.40 × 10−6/°C) is smaller than that of the glass phase (6.60 × 10−6/°C), the SiC particles remain in a state of compressive stress after the porcelain cooling. This characteristic restricts crack growth and offsets the tensile stress of the glass phase, restraining crystal growth owing to the tensile stress pinning the grains, such that the mechanical properties are improved.

“…prepared the anorthite coating on the porcelain tiles and the flexural strength increased by 72.6%, from 62 ± 3 to 107 ± 4 MPa. Sun et al 17 . prepared the prestressed ceramic tile by pressureless sintering a green body coated with a low CTE coating at 1200°C.…”

Section: Introductionmentioning

confidence: 99%

“…15 In the study of architectural ceramics, Tan et al 16 prepared the anorthite coating on the porcelain tiles and the flexural strength increased by 72.6%, from 62 ± 3 to 107 ± 4 MPa. Sun et al 17 prepared the prestressed ceramic tile by pressureless sintering a green body coated with a low CTE coating at 1200 • C. The flexural strength of prestressed porcelain tiles (89 ± 3 MPa) had been increased by 102% when the coating thickness was 67 µm compared to their uncoated counterpart (44 ± 3 MPa). By adjusting the CTE of the coatings with a small amount of spodumene, Pan et al 18 prepared a coating composed of cordierite, magnesia spinel, and a small amount of β-spodumene, and the flexural strength of the domestic ceramic body increased by 85.2% from 67.4 to 124.8 MPa.…”

Section: Introductionmentioning

confidence: 99%

Improving the flexural strength of porcelain by residual stress in anorthite coating

Zhang

Sun

et al. 2022

Self Cite

Flexural strength is an important parameter of domestic ceramics to meet the criteria for mechanized washing, filling, and sealing process in the automatic production line. In this work, the anorthite coating was prepared using calcite, silica, and alumina as raw materials. Taking the temperature with the highest matrix strength as the optimal temperature, the influences of chemical formulation on the phase composition and the coefficient of thermal expansion (CTE) of coatings were investigated. The enhancement effect of the coating with different formulations and surface number and thickness was compared. As a result, the flexural strength of the ordinary domestic ceramic body was improved due to the residual compressive stress in the coating caused by a mismatch of CTE between the coating and the matrix. At the optimal sintering temperature (1280 • C), the coating with 20 mass% alumina addition has the best strengthening effect on the body, in which the thickness of the anorthite coating is approximately 50 µm and the flexural strength has increased by 64.6%, from 88 ± 4 to 144 ± 6 MPa.