公开(公告)号：US4687655A

公开(公告)日：1987-08-18

申请号：US850748

申请日：1986-04-11

申请人： Klaus Hunold ,  Alfred Lipp ,  Klaus Reinmuth ,  Peter Arnold ,  Johannes Napholcz

发明人： Klaus Hunold ,  Alfred Lipp ,  Klaus Reinmuth ,  Peter Arnold ,  Johannes Napholcz

IPC分类号： C04B35/58 ,  C04B35/584 ,  C04B35/591 ,  C04B35/593

CPC分类号： C04B35/591 ,  C04B35/5935 ,  C04B2235/3205 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3272 ,  C04B2235/3873 ,  C04B2235/3895 ,  C04B2235/428 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/6562 ,  C04B2235/6567 ,  C04B2235/661 ,  C04B2235/72 ,  C04B2235/728 ,  C04B2235/77

摘要： The invention is a process for the manufacture of shaped articles of reaction-bonded silicon nitride in which pre-shaped articles of silicon powder are heated in a first stage under a nitrogen gas pressure of at least 6 MPa at a heating rate of not more than 50.degree. C. per hour to a reaction temperature below the melting point of silicon, the article is maintained at the reaction temperature for at least 0.5 hours and subsequently, in a second stage, heating the article at a heating rate of at least 500.degree. C. per hour to a temperature above the melting point of silicon and maintaining the article at that temperature for from 1 to 7 hours. The process can nitridate both pre-shaped articles consisting of silicon powder and, optionally, up to 15% by weight Si.sub.3 N.sub.4 powder and those containing up to 10% by weight of a sintering aid such as Y.sub.2 O.sub.3. In the former case, porous shaped articles having a density of from 87 to 91% TD and, in the latter case, dense shaped articles having a density of more than 98% TD, are obtained. In all cases, in a total nitridation time of less than 15 hours, a conversion of at least 95% of the silicon originally present into silicon nitride is achieved, which, in the finished shaped article, is substantially in the .beta.-modification.

摘要翻译： 本发明是一种反应粘合氮化硅成型制品的制造方法，其中在第一阶段在至少6MPa的氮气压力下加热预成型制品，其加热速率不大于 50℃/小时至低于硅熔点的反应温度，将制品保持在反应温度至少0.5小时，随后在第二阶段以至少500℃的加热速率加热制品 每小时至高于硅熔点的温度，并将制品在该温度下保持1至7小时。 该方法可以将由硅粉末和任选地至多15重量％的Si 3 N 4粉末组成的预成型制品和包含至多10重量％的烧结助剂例如Y 2 O 3的预成型制品进行氮化。 在前一种情况下，得到密度为87〜91％TD的多孔成形制品，在后一种情况下，得到密度大于98％TD的致密成形制品。 在所有情况下，在小于15小时的总氮化时间中，实现了最初存在于氮化硅中的硅的至少95％的转化率，其在成品成型制品中基本上处于β-改性。

公开(公告)号：US4351858A

公开(公告)日：1982-09-28

申请号：US238106

申请日：1981-02-25

申请人： Klaus Hunold ,  Klaus Reinmuth ,  Alfred Lipp ,  Johannes Napholcz ,  Peter Arnold

发明人： Klaus Hunold ,  Klaus Reinmuth ,  Alfred Lipp ,  Johannes Napholcz ,  Peter Arnold

IPC分类号： B22F3/14 ,  B22F3/12 ,  B22F3/15 ,  C04B35/645 ,  B05D3/02

CPC分类号： C04B35/6455 ,  B22F3/1241 ,  B22F3/1266 ,  B22F2998/00

摘要： The invention is a process for the manufacture of substantially pore-free shaped articles from polycrystalline material, such as tungsten carbide, silicon nitride, titanium boride or silicon carbide, in which encased articles preformed from pulverulent materials and having open pores are isostatically hot-pressed in a vacuum-sealed casing of vitreous or ceramic-like material in a high-pressure autoclave using an inert gas as pressure-transfer medium. Before the application of the casing material, a first layer comprising material that can be decomposed or melted, such as an organic wax or a resin-like product, or of a compressible heat-resistant material such as inorganic fibers or felts, is applied to the preformed articles. Then, the encased articles are thermally treated until the glass or ceramic layer is fused or sintered gas-tight. The articles pretreated in this manner are then isostatically hot-pressed.

摘要翻译： 本发明是一种用于从多晶材料制造基本上无孔的成形制品的方法，例如碳化钨，氮化硅，硼化钛或碳化硅，其中由粉状材料预成型并具有开孔的包封制品经均压热压 在使用惰性气体作为压力传递介质的高压高压釜中的玻璃质或陶瓷状材料的真空密封外壳中。 在施加外壳材料之前，将包含可分解或熔化的材料（例如有机蜡或树脂状产品）的第一层或诸如无机纤维或毡的可压缩耐热材料施加到 预成型制品。 然后，将包裹的物品进行热处理，直到玻璃或陶瓷层熔融或烧结为气密。 然后以这种方式预处理的制品被等压热压。