Zirconia Grinding Disc PM Sintered Parts
Zirconia is used in various applications due to its mechanical strength, light transmittance, refractive index, and the like. In recent years, in order to further improve the functions of electronic devices, biomaterials, and sliding parts, not only high strength and hydrothermal degradation resistance but also higher toughness are required.
Product Introduction
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Zirconia grinding disc PM sintered parts |
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Item |
Material |
Production Process |
Sintering Temperature |
Mold |
Custom |
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Zirconia grinding disc powder metallurgy |
Zirconia |
Powder metallurgy pressing |
1380℃ |
To be customized |
Yes |
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Available Materials |
Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713) |
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Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
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Roughness 1～5μm |
(±0.1%～±0.5%) |
7.3-7.6g/CM³ |
According to customer requirements |
0.03g～400g) |
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Zirconia is used in various applications due to its mechanical strength, light transmittance, refractive index, and the like. In recent years, in order to further improve the functions of electronic devices, biomaterials, and sliding parts, not only high strength and hydrothermal degradation resistance but also higher toughness are required.
The patent document discloses a method for producing a zirconia sintered body, in which 2-10% by weight of 2- 4 mol% of y2o3 as a stabilizer and zro2 micro powder with a particle size of 0.05 μm or less to obtain a mixed powder, then granulate the mixed powder, and mold the obtained granulated powder, and then form the obtained molded body Pre-sintering at normal pressure to a relative density of 96-98%, followed by hot hydrostatic pressure treatment at a temperature below 1480°C. In the patent literature, it is attempted to obtain a high-toughness zirconia sintered body by utilizing the microcrack strengthening mechanism. Specifically, attempts were made to introduce larger cracks into the sintered body in the form of closed pores, which were made smaller than the size of the original source of damage by subjecting the closed pores to hydrostatic pressure (hip), and by forming microscopic Due to the defects of the crack strengthening mechanism, Zirconia grinding disc PM sintered with high toughness is obtained.
Technical Realization Elements
1. The problem to be solved by the invention
However, in the production method of the patent document, there is a problem that it is complicated and difficult to control the particle sizes of the two powders. There is also a problem that the versatility of hip sintering is low.
The present invention was made in view of the following problems, and an object of the present invention is to provide a zirconia powder from which a high-toughness zirconia sintered body can be easily obtained. Another object is to provide a zirconia-sintered body with high toughness. It also aims to provide a method for manufacturing the zirconia sintered body.
The olution to the problem
It is known that, in general, the smaller the amount of the stabilizer, the higher the proportion of the monoclinic phase in the zirconia-sintered body. Among them, a high proportion of the monoclinic phase means that there are many transitions from the tetragonal phase to the monoclinic phase. Also, when the volume changes with the transition from the tetragonal phase to the monoclinic phase, cracks are generated in the zirconia-sintered body. Therefore, in the prior art, regarding the amount of the stabilizer, for example, in the case of using y2o3, the content of the stabilizer is about 3.0 mol%. In this way, in the prior art, if the strengthening mechanism of using microcracks has not been studied, a relatively large amount of stabilizer (containing about 3.0 mol%) is usually included.
On the other hand, the inventors of the present invention found that, surprisingly, by setting the ratio of the monoclinic phase contained in the crystal phase of the zirconia sintered body to 0.2% to 5%, the obtained zirconia sintered body can be made Cracks are not easy to occur, and microcracks are easy to form so that the toughness can be improved through the microcrack strengthening mechanism. Furthermore, it has also been found that in order to keep the ratio of the monoclinic phase within the range of 0.2% to 5%, it is preferable to include a stabilizer within a specific range that is less than the prior art.
It should be noted that since the microcrack strengthening mechanism is a conventionally known mechanism, a detailed description thereof will be omitted here.
It is difficult to well control the proportion of monoclinic phase in zirconia sintered body only by the amount of stabilizer.
As a result of intensive research, the present inventors have found that, surprisingly, by keeping the amount of the stabilizer contained in the zirconia powder within a specific range and keeping the pore distribution within a specific range, it is possible to The ratio of the monoclinic phase contained in the crystal phase of the zirconia sintered body obtained by sintering the zirconia powder can be easily kept at 0.2% or more and 5% or less.
2.The solution to the problem
It is known that, in general, the smaller the amount of the stabilizer, the higher the proportion of the monoclinic phase in the zirconia-sintered body. Among them, a high proportion of the monoclinic phase means that there are many transitions from the tetragonal phase to the monoclinic phase. Also, when the volume changes with the transition from the tetragonal phase to the monoclinic phase, cracks are generated in the zirconia-sintered body. Therefore, in the prior art, regarding the amount of the stabilizer, for example, in the case of using y2o3, the content of the stabilizer is about 3.0 mol%. In this way, in the prior art, if the strengthening mechanism of using microcracks has not been studied, a relatively large amount of stabilizer (containing about 3.0 mol%) is usually included.
On the other hand, the inventors of the present invention found that, surprisingly, by setting the ratio of the monoclinic phase contained in the crystal phase of the zirconia sintered body to 0.2% to 5%, the obtained zirconia sintered body can be made Cracks are not easy to occur, and microcracks are easy to form so that the toughness can be improved through the microcrack strengthening mechanism. Furthermore, it has also been found that in order to keep the ratio of the monoclinic phase within the range of 0.2% to 5%, it is preferable to include a stabilizer within a specific range that is less than the prior art.
It should be noted that since the microcrack strengthening mechanism is a conventionally known mechanism, a detailed description thereof will be omitted here.
It is difficult to well control the proportion of monoclinic phase in zirconia sintered body only by the amount of stabilizer.
As a result of intensive research, the present inventors have found that, surprisingly, by keeping the amount of the stabilizer contained in the zirconia powder within a specific range and keeping the pore distribution within a specific range, it is possible to The ratio of the monoclinic phase contained in the crystal phase of the zirconia sintered body obtained by sintering the zirconia powder can be easily kept at 0.2% or more and 5% or less.
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