Abstract:
The present invention relates to a SiAlON ceramic material mixture comprising at least one a-SSiAlON first phase, at least one β-SSiAlON phase and at least one amorphous and/or crystalline intergranular third phase containing group IV elements as additives; and a method of producing ceramic compact (100) which uses the said mixture and comprises the steps of preparing a SiAlON ceramic material mixture (101), attrition milling the said ceramic mixture in water (102), drying the milled ceramic mixture (103), pressing the dried ceramic mixture to form a green compact (104), and sintering the green compacts under atmospheric pressure (pressure-less) and flowing nitrogen (105).
Abstract:
The present invention relates to a ceramic material for cutting tool inserts, wherein the ceramic material is based on sialon comprising β-sialon (Si 6-z AL z O Z N 8-z ), α-sialon, (Y x Si 12-(m+n) AI (m+n) O n N 16-n ), a refractory hard phase comprising TiN, Ti(C,N), TiC, or a carbide of an element from one of groups IVb, Vb and VIb of the periodic table or a nitride of an element from one of groups IVb, Vb and VIb of the periodic table, or a combination of one or more thereof, and an intergranular amorphous or partly crystalline phase. The present invention also relates to a cutting tool insert made of said ceramic material and a method of manufacturing the same.
Abstract:
Der neuartige alpha-Sialon-Leuchtstoff zeichnet sich dadurch aus, dass er als Dotierung ein Metall M2 zusammen mit Mn enthält. M2 ist insbesondere Eu und/oder Yb.
Abstract translation:一种由烧结氮化硅制成的插入件,它包含锶-Si 3 N 4 N 4作为主要成分并含有Mg和稀土元素Re(Y,La,Ce,Er ,Dy,Yb),以MgO计为1.0〜7.0摩尔%,氧化物为0.4〜1.0摩尔%,总量为1.7摩尔%以上且低于7.5摩尔%。 插入物具有梯度结构,其中氧含量从表面朝向内部增加,即深度小于0.5mm的区域中的氧含量为0.8〜1.5质量%,在0.5mm以上的范围内的氧含量 深度为1.1〜2.3质量%,两者之间的氧含量差为0.1〜1.0质量%。
Abstract:
The invention provides a process for the production of sialon ceramic (and a sialon ceramic produced by such a process) comprising or including the steps of: (I) preparing a sialon reactant mixture including or comprising: a) silicon metal; b) clay; and c) a secondary aluminium source; (II) heating the reactant mixture in an atmosphere containing nitrogen gas to a temperature sufficient to substantially react the silicon metal, the secondary aluminium source and the nitrogen with the clay to form or to contribute to the forming of the sialon product; wherein the clay participates in the reaction as a source of aluminium and silicon. Further, the invention provides a method for preparing a sialon ceramic in a predetermined shape.
Abstract:
Die Erfindung betrifft Werkstoffe auf Basis von α/β-Sialon. Insbesondere betrifft die Erfindung Werkstoffe auf Basis von α/β-Sialon mit einer verbesserten Sinteraktivität und einer hohen Kantenbeständigkeit der aus den Werkstoffen gefertigten Sinterformkörper.
Abstract:
A SiAlON ceramic armor made from a starting powder mixture. The ceramic armor contains between about 60 weight percent and about 98 weight percent alpha SiAlON phase that contains an alpha SiAlON-bound rare earth element and between about 2 weight percent and about 40 weight percent of a beta SiAlON phase of the formula Si 6-z Al z O z N 8-z wherein the value of "z" ranges between about 0.2 and about 1.0. The ceramic armor further comprising sintering aid residue present as a result of the starting powder mixture containing between about 4 weight percent and about 14 weight percent of an oxide of an alpha SiAlON-bound rare earth element. The ceramic armor has a fracture toughness (KIC) greater than about 6.00 M.Pa m ½ and a Vickers hardness (H VN ) equal to greater than about 17.5 GPa.