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    • 1. 发明授权
    • Sinterable aluminum nitride composition, sintered body from this
composition and process for producing the sintered body
    • 可烧结的氮化铝组合物,该组合物的烧结体以及生产烧结体的方法
    • US5063183A
    • 1991-11-05
    • US569369
    • 1990-08-14
    • Hitofumi TaniguchiNobuyuki Kuramoto
    • Hitofumi TaniguchiNobuyuki Kuramoto
    • C04B35/581
    • C04B35/581
    • A process for producing a sintered body of aluminum nitride, which comprises(1) forming a raw molded article from a homogeneous mixture of(A) a fine powder of aluminun nitride, and(B) a sintering aid composed substantially of (a) at least one halogen compound of at least one metal selected from the group consisting of alkaline earth metals, lanthanum group metals and yttrium, and (b) at least one halogen-free compound of at least one metal selected from the group consisting of alkaline earth metals, lanthanum group metals and yttrium; and(2) sintering the raw molded article at a temperature of 1600.degree. to 2100.degree. C. in a non-oxidizing atmosphere. A sintered body having a high thermal conductivity and a high density of at least 3.2 g/cm.sup.3 is prepared by the process.
    • 一种氮化铝烧结体的制造方法,其特征在于,包括:(1)由(A)微粉末的氮化铝的均匀混合物形成原料成型体,(B)基本上由(a)组成的烧结助剂 至少一种选自碱土金属,镧族金属和钇的金属的至少一种卤素化合物,和(b)至少一种选自碱土金属的至少一种不含卤素的化合物 ,镧族金属和钇; 和(2)在非氧化性气氛中,在1600〜2100℃的温度下烧结原料模制品。 通过该方法制备具有高导热性和高密度至少3.2g / cm 3的烧结体。
    • 7. 发明授权
    • As-grown single crystal of alkaline earth metal fluoride
    • 碱土金属氟化物的单晶生长
    • US07364715B2
    • 2008-04-29
    • US10717281
    • 2003-11-19
    • Teruhiko NawataNobuyuki KuramotoHiroyuki YanagiTsuguo Fukuda
    • Teruhiko NawataNobuyuki KuramotoHiroyuki YanagiTsuguo Fukuda
    • C30B29/12C30B15/14G02B1/02
    • C30B15/14C30B15/00C30B29/12
    • A single crystal of alkaline earth metal fluoride is produced by a single crystal pulling method, has a straight barrel part diameter of not less than 17 cm, preferably has a straight barrel part length of not less than 5 cm, and has a light transmittance, as measured at a wavelength of 632.8 nm, of not less than 80%, preferably 90 to 98%. Further, the main crystal growth plane of the single crystal is the {111} plane or the {100} plane. The single crystal of alkaline earth metal fluoride has a large diameter as described above, and in spite that it is in an as-grown state, the peripheral surface is not opaque and the visible light transmittance is high. Therefore, evaluation of bubbles or inclusions in the crystal becomes feasible without performing complicated machining of the crystal, and from the single crystal, a large-sized optical material having advantageous properties such as high quality and high uniformity can be cut out.
    • 碱土金属氟化物的单晶通过单晶拉制法制造,直筒直径不小于17cm,优选具有不小于5cm的直筒部分长度,并具有透光率, 在632.8nm的波长下测得的,不小于80%,优选为90-98%。 此外,单晶的主晶体生长面是{111}面或{100}面。 碱土金属氟化物的单晶如上所述具有大的直径,尽管其处于生长状态,但是外周表面不透明,可见光透射率高。 因此,不需要对晶体进行复杂的加工就可以对晶体中的气泡或夹杂物进行评价,从而可以切断具有高质量,高均匀性等优点的大尺寸的光学材料。