Synthetic beta-spodumene solid solution, microcrystalline glass prepared from synthetic beta-spodumene solid solution and preparation method of microcrystalline glass
A technology of glass-ceramic and manufacturing method, which is applied in the field of inorganic materials, and can solve problems such as the reduction of the thermal expansion coefficient and the reduction of the solid solution capacity of β-spodumene
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Embodiment 1
[0060] A kind of synthetic β-spodumene solid solution, according to β-spodumene solid solution chemical formula Li 2 OAl 2 o 3 nSiO 2 Li in 2 O and Al 2 o 3 and nSiO 2 The theoretical weight ratio of , where n>4, will synthesize the required ratio of Li-containing 2 O and Al 2 o 3 and SiO 2 The corresponding raw materials are prepared, and the synthetic Li obtained by sintering at the sintering temperature 2 OAl 2 o 3 nSiO 2 , that is, β-spodumene solid solution, part of SiO with n>4 2 Excess free SiO absorbed into the β-spodumene lattice 2 or additional SiO 2 .
[0061] Preferably, the firing temperature is 1300°C-1400°C.
[0062] Preferably, the β-spodumene solid solution molecular formula Li 2 OAl 2 o 3 nSiO 2 Wherein n>4 means 4<n≤8, and the mass number of crystalline material accounts for more than 90% in the synthesized β-spodumene solid solution.
[0063] Further preferably, the chemical composition of the β-spodumene solid solution material compri...
Embodiment 2
[0071] A kind of manufacture method of above-described embodiment 1 synthetic β-spodumene solid solution, comprising:
[0072] According to the chemical formula Li of β-spodumene solid solution 2 OAl 2 o 3 nSiO 2 Li in (42 O and Al 2 o 3 and SiO 2 The proportion of the weight percentage will be the corresponding Li 2 O, Al 2 o 3 , SiO 2 The precursor raw material is made into a batch material, which is ground through a 200-mesh sieve, and the obtained dry powder material is sintered at a sintering temperature to obtain a β-spodumene solid solution.
[0073] Preferably, the Li 2 O and Al 2 o 3 and SiO 2 Among the precursor raw materials, Li 2 The O source is LiCO 3 , the source of alumina is 1000 mesh alumina powder, SiO 2 The source adopts 1000 mesh high-purity stone super fine powder.
[0074] According to the chemical composition in the 8 preparation examples of example 1 in embodiment 1, obtain the raw material batch formula of 8 preparation examples listed...
Embodiment 3
[0090] A kind of synthetic β-spodumene solid solution, according to β-spodumene solid solution chemical formula Li 2 OAl 2 o 3 nSiO 2 Li in 2 O and Al 2 o 3 and nSiO 2 Theoretical weight ratio, where n>4, in the ratio of Li 2 O and Al 2 o 3 and SiO 2 Among the corresponding raw materials, spodumene concentrate was used as the introduction of Li 2 OAl 2 o 3 4SiO 2 source, n>4 parts SiO 2 The source uses high-purity quartz powder, plus TiO 2 1%-2%. It is further preferred that in the spodumene concentrate, Na 2 O content≤0.3%, K 2 O content ≤ 0.3%. Synthesize the spodumene concentrate and high-purity quartz powder raw materials with the required ratio, plus TiO 2 Fine powder raw materials, prepared and sintered at the sintering temperature to obtain synthetic Li 2 OAl 2 o 3 nSiO 2 , that is, β-spodumene solid solution, part of SiO with n>4 2 Excess free SiO absorbed into the β-spodumene lattice 2 or additional SiO 2 . Its reaction equation is:
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