Environmentally friendly optical glass
An optical glass and environmental protection technology, applied in optics, optical components, instruments, etc., can solve the problems of high raw material cost, increased production cost, increased raw material cost, etc., and achieve the effect of reducing production cost and specific gravity
Active Publication Date: 2017-02-15
CDGM OPTICAL GLASS
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Problems solved by technology
However, in order to achieve the above performance, environmental protection optical glass will often use some such as Gd 2 o 3 , Nb 2 o 5 Raw materials such as scarce and expensive reserves lead to an increase in production costs
At the same time, these raw materials will affect the performance of optical glass, such as defects such as bubbles and streaks, and the difficulty of melting will also increase
[0004] CN101389574 and CN1666967 disclose two kinds of optical glasses with high refraction and medium dispersion, which all contain a large amount of Gd 2 o 3 , leading to higher cost of raw materials, which is not conducive to mass production
CN1152836 discloses a lead-free optical glass, which contains Nb 2 o 5 , the cost of raw materials increases, and it also contains WO 3 and TiO 2 , easy to color the glass
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[0021] The various components of the optical glass of the present invention will be described below, and unless otherwise specified, the content of each component is expressed in % by weight.
[0022] SiO 2 It is an important glass-forming body oxide, which forms an irregular continuous network with the structural unit of silicon-oxygen tetrahedron, and is the skeleton of optical glass. SiO 2 It has the function of maintaining the devitrification resistance of glass. When SiO 2 When the content exceeds 15%, the meltability of the optical glass decreases and the softening temperature increases. Therefore, SiO 2 The content of is limited to 8-15%, preferably 10-15%.
[0023] B 2 o 3 It is also an oxide that forms glass. If its content is less than 20%, the melting performance of the glass is poor, and the glass has a high tendency to devitrify; and when its content exceeds 30%, the refractive index of the glass is too low and the chemical stability of the glass becomes lo...
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Abstract
The invention provides environmentally-friendly optical glass with relatively low rare earth material content, the environmentally-friendly optical glass comprises the following components: by weight, 8-15% of SiO2, 20-30% of B2O3, 15-25% of La2O3, 3-9% of Y2O3, 25-35% of BaO, 3-10% of CaO and 0-3% of SrO. The environmentally-friendly optical glass does not contain Gd2O3, Nb2O5 and other raw materials which are scarce in reserve volume and expensive in price, greatly reduces the production cost; by replacement of BaO with a proper amount of CaO, the specific gravity of the environmentally-friendly optical glass can be effectively reduced. The environmentally-friendly optical glass does not contain lead, arsenic, cadmium and other components polluting to the environment, the optical glass with the refraction rate of 1.65-1.75, the Abbe number of 50-60, the transition temperature of less than 635 DEG C, and the density of less than 3.95g / cm <3> can be produced.
Description
technical field [0001] The invention relates to an environment-friendly optical glass, in particular to an environment-friendly optical glass with a refractive index of 1.65-1.75 and an Abbe number of 50-60. Background technique [0002] With the advancement of science and technology and people's increasing attention to the environment, environmentally friendly optical glass has become the mainstream of the optical glass system. Traditional optical glass components generally contain elements such as lead, arsenic, and cadmium, because lead oxide can increase the refractive index and dispersion of optical glass, arsenic oxide can clarify, and cadmium oxide can improve the chemical stability of glass. With the enhancement of people's awareness of environmental protection, this kind of traditional optical glass containing harmful elements is gradually being replaced by environmentally friendly optical glass. [0003] At the same time, with the development of the optoelectronic...
Claims
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IPC IPC(8): C03C3/068C03C4/00G02B1/00
Inventor 孙伟
Owner CDGM OPTICAL GLASS