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ZTA Toughened Ceramic

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ZTA Toughened Ceramic
Zirconia toughened ceramics (referred to as composite ceramics, ZTA), good white, corrosion resistance and chemical stability.Alumina has high hardness and zirconia has good toughness. The two materials form an excellent complex with high strength and toughness, which is more widely used. Zirconia toughened ceramics have excellent wear resistance because of its higher fracture strength and fracture toughness at room temperature.The specific proportion of the two materials can be adjusted according to the actual use requirements of users. The performance of zirconia toughened alumina ceramics is better than that of 99 alumina ceramics, and the price is much lower than that of zirconia ceramics. Many alumina ceramics are not capable of the occasion, reflecting a better than zirconia ceramics cost performance.Widely used in machinery, electronics, petroleum, chemical, aerospace and textile industries.

Performance parameters of alumina - zirconia structural ceramics -ZTA ceramics:

Item	Unit	Alumina(AL2O3)				Zirconia(ZrO2)
Item	Unit	AL2O3≥95	AL2O3≥99	AL2O3≥99.5	AL2O3≥99.8	ZTA	YTZ
Bulk density	g/cm3	3.7	3.80～3.85	3.85	3.9	3.8～4.6	6
hardness	HRA≥	86	88	88	88	86～88	88～90
Bending strength	Mpa≥	300	350	400	400	172～450	900
Maximum service temperature	℃	1500	1500	1500	1500	1400～1500	1500
Linear expansion coefficient	×10-6/℃	7.5	8.2	8.2	8.2
Dielectric constant	εr(20℃,1MHz)	9	9.2	9.2	9.2
Dielectric loss	tanδ×10-4,1MHz	3	2	2	2
Volume resistivity	Ω·cm(20℃)	1013	1014	1014	1014	1013	1014
Breakdown strength	KV/mm,DC≥	20	20	20	20
Acid resistance	mg/cm2≤	0.7	0.7	0.7	0.7
Alkali resistance	mg/cm2≤	0.2	0.1	0.1	0.1
Wear resistance	g/cm2≤	0.2	0.1	0.1	0.1
The compressive strength	Mpa≥	2500	2500	2500	2800	2300～2900	2500
Flexural strength	Mpa≥	200	350	350	350
Modulus of elasticity	Gpa	300	350	350	350
Poisson's ratio		0.2	0.22	0.22	0.22
Coefficient of thermal conductivity	W/m·K(20℃)	20	25	25	25

The toughening method:

1. Zirconia toughened

The most commonly used method of toughening alumina ceramics is ZrO2 (vk-r30).When pure Zr0 (VK-R30) is added to alumina and particles form ZrO2 toughened alumina ceramics, the toughness can be significantly improved when the content is appropriate.

Mechanical properties of commercial high purity alumina ceramics and ZrO2 (vk-r30) toughened alumina ceramics were compared

Item	99% alumina ceramics	zirconia toughened alumina ceramics
The density of	3.85	3.93
Flexural strength	350MPa	480MPa
The compressive strength	3600MPa	3300MPa
hardness	1900HV	1600HV
Impact strength	5MPam1/2	7MPam1/2

2. Whisker and fiber toughened

The whisker is a ceramic single crystal with a certain aspect ratio (0.1 -- 1.8 um in diameter, 35 -- l50um in length) and less defects.It has high strength and is a very good toughening and strengthening body of ceramic matrix composite.Fiber length is several times longer than ceramic whisker, which is also a good ceramic toughening body.

3. Grain toughening

The addition of particles with high elastic modulus (such as SiC, TiC, TiN, etc.) of certain particle size into alumina material can induce the deflection and bifurcation of cracks and consume the fracture energy, thus improving the toughness.

4. Alumina self-toughening

Ceramics made of nanometer alumina powder show excellent superplasticity at low temperature without plasticizer.The nanometer material can improve the shape and properties of ceramic grains.

Ceramic materials although there are many superior characteristics, such as high temperature mechanical properties, chemical corrosion resistance, electrical insulation, high hardness and wear resistance, etc., but because of its structure lack like metal ceramic materials were determined under stress occurred plastic deformation due to sliding ability, prone to defects, crack, and easily lead to a high degree of stress concentration, thus the essence of the brittle ceramic materials were determined.Therefore, the toughening of ceramics, especially alumina ceramics, has become the core of the research on structural ceramics in recent years.

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