摘要:
A zirconia sintered body having not only high strength but also excellent aesthetic properties. A colored translucent zirconia sintered body, characterized by containing an iron compound and from 2 to 4 mol % of yttria, showing a lightness L* of from 51 to 80 in L*a*b* color system, and having a relative density of at least 99.80%. The colored zirconia sintered body preferably has a total light transmittance of at least 20% as measured at a sample thickness of 1 mm and with a D65 light source. The colored translucent zirconia sintered body has aesthetic properties equivalent to those of natural teeth and is particularly suitable for a zirconia sintered body to be used for dental applications, and further, suitable for a mill blank such as an artificial tooth material or the like, and an orthodontic bracket.
摘要翻译:氧化锆烧结体不仅具有高的强度,而且具有优异的美观性。 一种着色的半透明氧化锆烧结体,其特征在于含有铁化合物和2〜4摩尔%的氧化钇,在L * a * b *色系中显示51〜80的亮度L *,相对密度为 至少99.80%。 着色的氧化锆烧结体的样品厚度为1mm时,透光率为20%以上,D65光源为佳。 着色的半透明氧化锆烧结体具有与天然牙齿同等的美学特性,特别适用于用于牙齿应用的氧化锆烧结体,并且还适用于诸如人造牙齿材料等的研磨坯料,以及 正畸托架
摘要:
A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 μm, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 μm, and having a rate of sintering shrinkage in normal-pressure sintering (Δρ/ΔT; g/cm3·° C.) of 0.0125 or higher but 0.0160 or lower should be subjected to normal-pressure sintering in the atmosphere.
摘要:
A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 μm, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 μm, and having a rate of sintering shrinkage in normal-pressure sintering (Δρ/ΔT; g/cm3·° C.) of 0.0125 or higher but 0.0160 or lower should be subjected to normal-pressure sintering in the atmosphere.
摘要:
A subject of the invention relates to providing a powder for a translucent zirconia sintered body which is necessary for the production of a zirconia sintered body having a high sintered-body density and high strength and giving an excellent sense of translucency, without conducting any special sintering, such as HIP sintering. The invention relates to a technique for obtaining, through normal-pressure sintering, a translucent zirconia sintered body characterized by comprising zirconia which contains 2-4 mol % yttria as a stabilizer and has an alumina content of 0.2 wt % or lower, and by having a relative density of 99.8% or higher and a total light transmittance, as measured at a thickness of 1.0 mm, of 35% or higher. It is preferred that a powder containing 0-0.2 wt % alumina with a particle diameter of 0.01-0.5 μm, having a BET specific surface area of 5-16 m2/g and an average particle diameter of 0.3-0.7 μm, and having a rate of sintering shrinkage in normal-pressure sintering (Δρ/ΔT; g/cm3·° C.) of 0.0125 or higher but 0.0160 or lower should be subjected to normal-pressure sintering in the atmosphere.
摘要:
Disclosed is a simplified method for producing a polysiloxane in which wastes discharged during the production are reduced. This method for producing a polysiloxane is characterized in that a mixture of a silicon-containing compound represented by the following average composition formula (A): R1a(R2O)bSiO[(4-a-b)/2] (where R1s represent the same or different substituted or unsubstituted monovalent hydrocarbon groups; R2 represents a monovalent hydrocarbon group having 4 or less carbon atoms; and a and b satisfy 0≦a≦3; 0
摘要:
A zirconia sintered body having not only high strength but also excellent aesthetic properties. A colored translucent zirconia sintered body, characterized by containing an iron compound and from 2 to 4 mol % of yttria, showing a lightness L* of from 51 to 80 in L*a*b* color system, and having a relative density of at least 99.80%. The colored zirconia sintered body preferably has a total light transmittance of at least 20% as measured at a sample thickness of 1 mm and with a D65 light source. The colored translucent zirconia sintered body has aesthetic properties equivalent to those of natural teeth and is particularly suitable for a zirconia sintered body to be used for dental applications, and further, suitable for a mill blank such as an artificial tooth material or the like, and an orthodontic bracket.
摘要翻译:氧化锆烧结体不仅具有高的强度,而且具有优异的美观性。 一种着色的半透明氧化锆烧结体,其特征在于含有铁化合物和2〜4摩尔%的氧化钇,在L * a * b *色系中显示51〜80的亮度L *,相对密度为 至少99.80%。 着色的氧化锆烧结体的样品厚度为1mm时,透光率为20%以上,D65光源为佳。 着色的半透明氧化锆烧结体具有与天然牙齿同等的美学特性,特别适用于用于牙齿应用的氧化锆烧结体,并且还适用于诸如人造牙齿材料等的研磨坯料,以及 正畸托架