CN113372140A - 包括抗氧化剂涂层的碳-碳复合物 - Google Patents
包括抗氧化剂涂层的碳-碳复合物 Download PDFInfo
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- CN113372140A CN113372140A CN202110129207.9A CN202110129207A CN113372140A CN 113372140 A CN113372140 A CN 113372140A CN 202110129207 A CN202110129207 A CN 202110129207A CN 113372140 A CN113372140 A CN 113372140A
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Abstract
本发明题为“包括抗氧化剂涂层的碳‑碳复合物”。包括碳‑碳复合基底的制品可在用于氧化环境中之前用抗氧化剂涂层处理。抗氧化剂涂层可被配置成减少C‑C组合物的外表面处的氧化并且减少氧化剂进入由C‑C复合基底限定的孔或其他开放通道中以避免内部氧化。示例性制品包括C‑C复合基底、粘结涂层和抗氧化剂涂层。C‑C复合基底限定摩擦表面和非摩擦表面。粘结涂层被设置在非摩擦表面上。抗氧化剂涂层可被设置在粘结涂层的至少一部分上。抗氧化剂涂层可包含二硅酸镱和烧结助剂。
Description
技术领域
本公开涉及碳-碳复合材料,诸如由碳-碳复合材料制成的飞机制动盘。
背景技术
碳-碳(C-C)复合物可被用于许多高温应用中。例如,航空航天工业采用C-C复合物部件作为商用和军用飞机的摩擦材料,诸如制动器摩擦材料。在一些示例,诸如高温应用中,C-C复合物可能易受物理机械特性的氧化和劣化的影响。
发明内容
在用于氧化环境中之前,可用抗氧化剂涂层处理碳-碳复合基底。在一些示例中,抗氧化剂涂层可被配置成减少C-C组合物的外表面处的氧化并且减少氧化剂进入由C-C复合基底限定的孔或其他开放通道中以避免内部氧化。
在一些示例中,本公开涉及包括C-C复合基底、粘结涂层和抗氧化剂涂层的制品。C-C复合基底限定摩擦表面和非摩擦表面。粘结涂层被设置在非摩擦表面上。抗氧化剂涂层被设置在粘结涂层的至少一部分上。抗氧化剂涂层包含二硅酸镱和烧结助剂。
在一些示例中,本公开涉及一种方法,该方法包括在碳-碳复合基底的非摩擦表面上形成粘结涂层。该方法也包括在粘结涂层的至少一部分上形成抗氧化剂涂层,该抗氧化剂涂层包含二硅酸镱和烧结助剂。
在一些示例中,本公开涉及包括C-C复合基底、粘结涂层和抗氧化剂涂层的C-C复合制动盘。C-C复合基底限定摩擦表面和非摩擦表面。粘结涂层被设置在非摩擦表面上。抗氧化剂涂层被设置在粘结涂层的至少一部分上。抗氧化剂涂层包含二硅酸镱和烧结助剂。
本公开的一个或多个示例的细节在以下附图和说明书中阐述。本公开的其他特征、目的和优点将从描述和附图以及从权利要求书中显而易见。
附图说明
图1为包括抗氧化剂涂层的示例性碳-碳复合物的透视图,所述抗氧化剂涂层包含至少一种金属氧化物。
图2为包括抗氧化剂涂层和包含抗氧化剂的次表面区域的示例性碳-碳复合物的概念性和示意性剖视图。
图3为示出用于形成碳-碳复合物的示例性技术的图表,所述碳-碳复合物包括包含至少一种金属氧化物的抗氧化剂涂层。
具体实施方式
本公开描述了制品以及形成制品的技术,所述制品包括碳-碳复合基底、粘结涂层和抗氧化剂涂层。粘结涂层可被设置在碳-碳复合基底的非摩擦表面上,例如制品的操作期间不经受摩擦磨损的表面。抗氧化剂涂层可被设置在粘结涂层的至少一部分上。抗氧化剂涂层可包含基体材料和烧结助剂。抗氧化剂涂层可被配置成粘附到粘结涂层,在大于约1650华氏度(℉)(1000摄氏度(℃))和/或高达至少3000℉(1645℃)的温度下保持热稳定,以具有类似于粘结涂层和/或C-C复合基底或它们的组合的CTE的热膨胀系数(CTE)。
图1为示例性制品10的透视图,该制品可包括位于下面的碳-碳复合基底12上的粘结涂层(未示出)和抗氧化剂涂层18。在一些示例中,制品10包括制动盘,诸如飞行器的制动机构的转子或定子。在其他示例中,制品10可限定在可超过约2,500℉(1,371℃)的温度下,诸如可超过3000℉(1,649℃)的温度,在氧化环境中操作的其他机械部件。在图1的示例中,制品10包括外圆周表面16上的抗氧化剂涂层18。在制品10包括制动盘的示例中,外圆周表面16可限定非摩擦表面。环形表面17A和/或17B可限定制品10的摩擦表面。
基底12可包括碳基增强纤维和至少部分地围绕碳基增强纤维的碳基基质材料。在一些示例中,基底12可由包括碳纤维或碳前体纤维的多孔预成型件形成。可用于产生基底12的多孔预成型件的示例包括但不限于:纤维预成型件诸如织造纤维预成型件、非织造纤维预成型件、短切纤维和粘结剂预成型件、粘结剂处理的无规纤维预成型件、碳纤维预成型件、或陶瓷纤维预成型件;泡沫预成型件;多孔碳主体预成型件;或多孔陶瓷主体预成型件。在一些示例中,多孔预成型件包括多个机械结合层,其可为例如多个纤维层,诸如多个织造或非织造织物层,其连接在一起,例如通过粘结剂(诸如树脂粘结剂)或者经由多个层的针刺结合。在一些示例中,层包括一个或多个丝束层、一个或多个幅材层或它们的组合。丝束层可包括一个或多个纤维丝束。纤维丝束可以任何合适的布置被布置,包括例如线性的、径向的、弦状的等。幅材层可包括幅材纤维,该幅材纤维可包括纤维的相对短的、短切的和缠结的纤维。
在其他示例中,多孔预成型件可不包括预定义层,而是可由例如一束经由针刺机械地结合在一起的纤维形成。在其他示例中,可使用前述类型的多孔预成型件中的任一种的组合。
在一些示例中,多孔预成型件可使用碳纤维形成。在其他示例中,多孔预成型件可使用碳纤维前体材料诸如聚丙烯腈(PAN)纤维形成,碳纤维前体材料随后热解以形成碳纤维。在一些示例中,多孔预成型件可包括各向同性碳或在热解时转化成各向同性碳的前体材料。例如,在热解时,PAN可转化成各向同性碳。
基底12也可包括至少部分地包封碳纤维的基质材料。可使用多种技术中的一种或多种技术将基质材料引入多孔预成型件中,所述多种技术包括例如化学气相沉积/化学蒸气渗透(CVD/CVI)、树脂传递模塑(RTM)、真空/压力渗透(VPI)、高压浸渍/碳化(PIC)等。可用于RTM、VPI或PIC工艺中的致密剂的示例包括但不限于提供相对高碳收率(例如大于约80%)并且可具有相对高粘度的液体树脂或沥青(例如各向同性和/或中间相沥青),诸如合成的中间相沥青、煤焦油衍生的沥青诸如经热处理或化学处理的煤焦油、石油衍生的沥青、合成的沥青衍生物、经热处理的沥青、催化转化的沥青,以及热固性或热塑性树脂诸如酚醛树脂。在一些示例中,碳-碳复合预成型件可经受足够数量的压实步骤以得到介于约1.5克/立方厘米(g/cm3)和约1.85g/cm3之间或更高的密度。
在RTM的一些示例中,将碳-碳复合预成型件放置到与所需部件几何结构匹配的模具中。可使用压力在低温(50℃至150℃)下将相对低粘度的热固性树脂注入被容纳在模具内的多孔碳-碳复合预成型件中或在真空下诱导。树脂在从模具中取出之前在模具内固化。
在RTM工艺的一个示例中,可使用注入装置例如在介于约10秒和约40秒之间,诸如约介于约15秒和约40秒之间将致密剂诸如树脂或沥青快速注入包封多孔预成型件的模具中。在一个示例中,所述注入装置可包括加热器挤出机,所述加热器挤出机使致密剂原料诸如树脂粒料熔融,并且将液体致密剂喂料到储液器。注入器诸如活塞可以相对高的压力并以相对高的速度将液体致密剂驱动到模具中。在共同转让的美国专利6,537,470和7,172,408中描述了示例性注入装置和使用该装置的方法的进一步描述,这些专利的整个内容以引用方式并入本文。
在VPI的一些示例中,在惰性条件下将碳-碳复合预成型件加热至远高于浸渍沥青的熔点。然后,通过排空碳-碳复合预成型件来除去预成型件的孔中的气体。最后,随着总压力恢复到一个大气压或更高,允许熔融沥青渗透预成型件的孔。在VPI工艺中,一定体积的树脂或沥青在一个容器中熔融,而多孔碳-碳复合预成型件在真空下被容纳在第二容器中。使用真空和压力的组合将熔融树脂或沥青从容器一转移到被容纳在第二容器中的多孔预成型件中。VPI工艺通常采用拥有低至中等粘度的树脂和沥青。此类沥青可提供比中间相沥青更低的碳收率。
在将致密剂注入多孔预成型件中之后,可将致密剂热解以除去任何非含碳元素,这可将渗透到多孔预成型件内的致密剂转化成碳-碳复合物。在一个示例中,在使用合成的中间相沥青的情况下,可使用热等静压(HIP)热解沥青。在另一个示例中,可通过在含氧环境中将渗透到多孔预成型件中的致密剂加热至低于致密剂的软化点的温度来稳定致密剂。氧可与致密剂反应以在致密剂内提供交联。一旦合适量的氧气已被吸收和/或反应成致密沥青,就可将多孔预成型件加热至热解温度,而不使致密剂熔融或者从多孔预成型件中渗出致密剂中的任一种。
当致密剂热解时,致密剂可形成各向异性碳。尽管致密剂可为溶剂至高收率碳前体,但所得各向异性碳仍可具有一些孔隙率。在一些示例中,孔隙率可取决于致密剂的类型,例如碳或树脂的类型。在一些示例中,各向异性碳的孔中的至少一些是开放的,例如,其中相邻孔中的至少一些是连接的。
在一些示例中,可以在任何RTM、VPI或PIC压实步骤之后执行附加的压实步骤,以实现制品10的最终密度。例如,可使具有相对低粘度的液体致密剂诸如糠醇渗透到保持在致密预成型件中的孔中,以至少部分地填充剩余的孔。又如,可执行一个或多个CVD/CVI循环以至少部分地填充致密预成型件中的剩余孔。
在一些示例中,如图1中所示,制品10可具有大致盘形的几何结构,例如用作制动盘。制品10包括具有中心镗孔14的碳-碳复合基底12,该中心镗孔延伸穿过碳-碳复合基底12的轴向厚度T。在一些示例中,碳-碳复合基底12具有在镗孔14处的内径ID、在外圆周表面16处的外径OD以及轴向厚度T,该轴向厚度为在与测量内径ID和外径OD的方向基本上正交的方向上测量的环形表面17A和17B之间的距离。在其他示例中,制品10可限定不同的几何结构。
制品10包括在碳-碳复合基底12的外圆周表面16上的抗氧化剂涂层18。抗氧化剂涂层18的组分包括基体材料,并且在一些示例中,包括烧结助剂。在一些示例中,抗氧化剂涂层18可仅包含基体材料。在一些示例中,抗氧化剂涂层18可包含多于一种基体材料,诸如两种或三种不同的基体材料。在一些示例中,抗氧化剂涂层18可包含一种或多种烧结助剂,诸如两种或三种不同的烧结助剂。基体材料可包括例如高温耐火材料、耐火金属硅酸盐、一种或多种镧系二硅酸盐、单硅酸镱、二硅酸镱、单硅酸钇、二硅酸钇、钛酸铝、二硅酸镥、二硅酸铒、二硅酸钪、二硅酸钬、莫来石、碳化硅或氮化硅中的至少一种。在一些示例中,抗氧化剂涂层18的基体材料可为单独的二硅酸镱或与另一种基体材料的组合。在一些示例中,抗氧化剂涂层18可由二硅酸镱和烧结助剂组成。在一些示例中,抗氧化剂涂层18可基本上由二硅酸镱和烧结助剂组成。
在一些示例中,包含二硅酸镱的抗氧化剂涂层18可具有高达抗氧化剂涂层18的熔点的稳定结晶相。与将不具有稳定结晶相的抗氧化剂涂层加热和/或冷却至高达抗氧化剂涂层的熔点相关联的相变可导致抗氧化剂涂层的膨胀和收缩,这因此导致破裂和/或剥落。
在一些示例中,与不包含二硅酸镱的抗氧化剂涂层相比,包含二硅酸镱的抗氧化剂涂层18可具有低热膨胀系数(CTE)。在一些示例中,低CTE相对于碳-碳复合基底12的CTE和/或粘结涂层20的CTE可以是低CTE失配。在操作期间,相对于碳-碳复合基底或粘结涂层具有高CTE失配的抗氧化剂涂层可导致抗氧化剂涂层的破裂和剥落。
在一些示例中,与不包含二硅酸镱的抗氧化剂涂层相比,包含二硅酸镱的抗氧化剂涂层18可具有高熔点。相对高的熔点可使得抗氧化剂涂层18能够被用于需要高达约3000℉的耐高温的应用中。
在一些示例中,基体材料的重量百分比(重量%)可在抗氧化剂涂层组合物的约90重量%至约99.9重量%,诸如约94重量%至约99重量%或约94重量%至约98重量%的范围内。在一些示例中,基体材料可大于抗氧化剂涂层组合物的约90重量%。通过包含大于约90重量%的基体材料,附加的抗氧化剂涂层组分(例如,烧结助剂)可对抗氧化剂涂层18的所选物理特性(诸如抗氧化剂涂层18的热膨胀系数(CTE))具有可忽略不计的影响。
烧结助剂可包括任何合适的材料,所述任何合适的材料被配置成相对于不含烧结助剂的基体材料,通过用更低能量的固体-固体界面替换固体-蒸气界面从而减小孔隙率,改善由抗氧化剂涂层组分的颗粒的表面积减小而导致的自由能变化以及表面自由能的降低。在一些示例中,烧结助剂可包括被配置成与基体材料形成共晶组合物的材料。在一些示例中,烧结助剂可包括氧化铝、莫来石、堇青石、硅酸镧、硅酸锂、硅酸钴、硅酸锶钡、硅酸钡、硅酸锶、氧化钛、架状硅酸盐(钾长石(K-spar)端元KAlSi3O8、钠长石端元NaAlSi3O8和钙长石端元CaAl2Si2O8)、斜长石、钡长石(钡长石BaAl2Si2O8和钡冰长石(K,Ba)(Al,Si)4O8)。在一些示例中,烧结助剂的重量百分比(重量%)可在抗氧化剂涂层组合物的约0.1重量%至约6重量%,诸如约1重量%至约6重量%或约2重量%至约6重量%的范围内。在一些示例中,烧结助剂可小于抗氧化剂涂层组合物的约10重量%。通过包含小于约10重量%的烧结助剂,烧结助剂可对抗氧化剂涂层18的所选物理特性(诸如抗氧化剂涂层18的热膨胀系数(CTE))具有可忽略不计的影响。在其中制品10的操作温度小于约2500℉的示例中,烧结助剂可小于抗氧化剂涂层组合物的约35重量%,余量(例如,大于约65重量%)为如上所述的基体材料。
在一些示例中,抗氧化剂涂层的组成可被选择为通过液相烧结机制致密化。例如,液相烧结机制可包括通过覆盖基体材料颗粒的表面的液(玻璃)相来粘结大部分基体材料颗粒。这样,抗氧化剂涂层18可包含由玻璃基质中的基体材料颗粒制成的复合物。在一些示例中,抗氧化剂涂层的组合物的致密化也可包括固态烧结机制。例如,由所选烧结助剂(例如,氧化铝等)提供的一定量的液体可不覆盖每个基体材料颗粒的表面。在其中基体材料包含二硅酸镱(94重量%至98重量%)并且烧结助剂包含氧化铝(2重量%至6重量%)的示例中,组合物可通过液态机制和固态机制烧结。
在一些示例中,制品10可在使用期间经受高温。例如,在制动事件期间,碳-碳复合制动盘可经受高达约1,000℃的温度。在一些示例中,在制动事件期间,碳-碳复合制动盘可经受高达约1,650℃(3,000℉)的温度。因此,在一些示例中,抗氧化剂涂层18的基体材料和/或烧结助剂可在高达约1,650℃的温度下为稳定的。在该语境中,“稳定”可意指不降解成其组成元素、不与碳反应或者不与其中使用抗氧化剂涂层18的环境中存在的其他元素或化合物反应中的至少一者。
在一些示例中,形成抗氧化剂涂层18的组分(例如,高温耐火材料和/或烧结助剂)的标准自由能可小于在低于约1,650℃的所有温度下形成组分的分解产物(诸如例如一氧化碳)的标准自由能。
在一些示例中,抗氧化剂涂层18可相对于例如磷酸盐基涂层(诸如磷酸铝基涂层)在更高温度下为稳定的。一些磷酸盐基涂层可在高达约1650℉为稳定的,高于该值,五氧化二磷损失可随时间推移降低氧化保护和/或导致剩余的磷酸盐基涂层的结构变化。在一些示例中,抗氧化剂涂层18可在高达约3000℉(1645℃)为稳定的和/或具有大于约3300℉(1816℃)的熔点。
抗氧化剂涂层18可具有任何合适的厚度。在一些示例中,抗氧化剂涂层18可具有在约90微米至约100微米范围内的厚度。在一些示例中,抗氧化剂涂层18的厚度可小于90微米,诸如在约10微米至约90微米的范围内。在一些示例中,抗氧化剂涂层18的厚度可大于100微米,诸如在约100微米至约500微米的范围内。
制品10另外包括粘结涂层(例如,粘结层)。图2为制品10的概念性和示意性剖视图,示出了C-C复合基底12、抗氧化剂涂层18和示例性粘结涂层20。粘结涂层20被直接设置在碳-碳复合基底12的外圆周表面16上。粘结涂层20可包括例如硅基涂层(诸如碳化硅涂层)、另一种碳化物基涂层(诸如碳化钛);或任何其他合适的粘结涂层,所述任何其他合适的粘结涂层被配置成与不含粘结涂层20的抗氧化剂涂层18对C-C复合基底12的粘附性相比改善抗氧化剂涂层18对C-C复合基底12的粘附性。
粘结涂层20可具有任何合适的厚度。在一些示例中,粘结涂层20可具有在约10微米至约100微米范围内的厚度。在一些示例中,粘结涂层20的厚度可小于10微米。在一些示例中,粘结涂层20的厚度可大于100微米,诸如在约100微米至约500微米的范围内。
在其中粘结涂层20包括碳化硅涂层的示例中,粘结涂层20可通过C-C复合基底12的硅和碳之间的原位反应形成。例如,硅能够被喷涂到C-C复合基底12的表面上并在约2,642℉(1450℃)下真空热处理,如授予Forsythe等人的共同转让的美国专利6,555,173中所述,该专利的整个内容以引用方式并入本文。
在一些示例中,抗氧化剂涂层18可具有类似于粘结涂层20和/或C-C复合基底12的CTE的热膨胀系数(CTE)。类似地,抗氧化剂涂层18、粘结涂层20和/或C-C复合基底12的CTE可在足以基本上防止抗氧化剂涂层18在制品10的正常操作期间(例如,在涂层制造的共同公差内)分层、剥落和/或破裂的阈值内。在一些示例中,C-C复合基底12可具有在约1.5份/百万/摄氏度(ppm/℃)至约3.3ppm/℃范围内的轴向CTE。在一些示例中,抗氧化剂涂层18可具有在约3ppm/℃至约4.5ppm/℃范围内,诸如在约3.5ppm/℃至约4.5ppm/℃范围内的CTE。在一些示例中,粘结涂层20可具有在约1.5ppm/℃至约4.5ppm/℃范围内的CTE。通过具有类似于粘结涂层和/或C-C复合基底的CTE的CTE,抗氧化剂涂层在经受热循环时,诸如在包括C-C复合基底12的制品的正常操作期间,可抵抗分层、剥落和/或裂纹发展。抵抗分层、剥落和/或破裂可通过例如至少减少氧气进入C-C复合基底12来增加制品10的可使用寿命。
图3为示出用于形成制品的示例性技术的图表,该制品包括C-C复合基底、形成于C-C复合物上的粘结涂层以及施加到粘结涂层的抗氧化剂涂层。图3的技术是相对于上文参照图1和图2所述的制品10进行描述的,然而,该技术可被用于形成其他制品,并且其他技术可被用于形成制品10。另外,图3相对于包含基体材料和烧结助剂的抗氧化剂涂层18进行了描述,所述基体材料包含二硅酸镱,尽管在其他示例中,抗氧化剂涂层18可包含上述基体材料中的任何一种或多种。
在一些示例中,图3中所示的技术任选地可包括通过如上所述的预成形件致密化工艺形成C-C复合物12。在压实C-C复合物12之后,该技术可包括形成粘结涂层20,并且随后形成抗氧化剂涂层18。
图3中所示的技术包括在C-C复合基底12的非摩擦表面16上形成粘结涂层20(32)。在粘结涂层20包含碳化硅的示例中,形成粘结涂层20可包括将含硅材料施加(例如,涂漆、喷涂等)到C-C复合基底12的表面16。含硅材料可包括例如硅金属(Si);Si和碳化硅(SiC);Si、SiC和氧化铝;Si、SiC和二硅酸钼(MoSi2);Si和MoSi2;Si和二硅酸钽(TaSi2);Si和二硅酸钛(TiSi2);或Si以及本文所述的一种或多种二硅化物的组合。形成粘结涂层20也可包括在真空中加热含硅材料和C-C复合基底12以通过含硅材料的硅和C-C复合基底12的碳之间的原位反应形成碳化硅粘结涂层20。在一些示例中,加热含硅材料和C-C复合基底12可包括在真空中将含硅材料和C-C复合基底12加热至约2,642℉(1450℃)。
类似的技术可被用于形成其他粘结涂层,诸如碳化钛(TC)粘结涂层。例如,TiC粘结涂层可包含钛(Ti)金属加SiC,并且可使用二硅化物。然而,它们的加工温度高于1450C,其接近钛的熔点(1660C)。
图3中所示的技术也包括在粘结涂层的至少一部分上施加抗氧化剂涂层,该抗氧化剂涂层包含二硅酸镱和烧结助剂(34)。在一些示例中,施加抗氧化剂涂层(34)可包括形成抗氧化剂涂层漆以及将漆施加到C-C复合基底12。例如,该技术可包括将抗氧化剂涂层18的组分(例如,基体材料,诸如二硅酸镱)和烧结助剂(诸如氧化铝、莫来石或堇青石)共混以形成抗氧化剂涂层粉末。在一些示例中,共混可包括使用球磨机或用于陶瓷加工和任选地筛分所得抗氧化剂涂层粉末的任何其他合适的技术进行共混。
该技术也可包括将抗氧化剂涂层粉末与任何合适的溶剂(例如,粘结剂和稀释剂)混合以形成抗氧化剂涂层糊剂。抗氧化剂涂层浆料可具有高固体载量。在一些示例中,高固体载量可大于约80重量%固体。该技术也可包括将抗氧化剂涂层糊剂与相同或不同的溶剂混合以形成抗氧化剂涂层漆。抗氧化剂涂层漆可包括用于刷漆、喷漆或浸涂到C-C复合基底的表面上的合适流变特性。该技术也包括用抗氧化剂涂层18漆刷涂、喷涂或浸涂C-C复合基底12中的至少一种。
在用抗氧化剂涂层18组合物对C-C复合基底12涂漆之后,该技术可包括加热抗氧化剂涂层组合物以蒸发基本上所有的溶剂并形成干燥的抗氧化剂涂层复合物。例如,加热C-C复合基底12和抗氧化剂涂层组合物可包括在约170℃的烘箱中干燥合适的持续时间。
在干燥抗氧化剂涂层组合物之后,该技术可包括加热干燥的抗氧化剂涂层复合物以除去抗氧化剂涂层的任何残余溶剂或有机组分,从而形成绿色抗氧化剂涂层复合物。例如,加热干燥的抗氧化剂涂层复合物可包括将C-C复合物基底12和干燥的抗氧化剂涂层在约350℃的烘箱中加热合适的持续时间。在一些示例中,加热干燥的抗氧化剂涂层复合物可包括将C-C复合物基底12和干燥的抗氧化剂涂层在约400℃的烘箱中加热合适的持续时间。
在加热干燥的抗氧化剂涂层复合物之后,该技术可包括使绿色抗氧化剂涂层复合物致密化以形成抗氧化剂涂层12。在一些示例中,使绿色抗氧化剂涂层复合物致密化可包括例如真空烧结、低压烧结、热等静压(HIP)、惰性气体下的大气压烧结或改性火花等离子体烧结。例如,致密化可包括在约1485℃至约1550℃下烧结约20至约120分钟,这包括低于组块胶合所需的温度。
在一些示例中,加热步骤诸如压实可伴有烧结收缩,这导致微观泥浆破裂。为了实现期望的厚度并且也填充泥浆裂纹,可重复涂层工艺。
本文所述的技术可包括与其他技术相比的优点,诸如例如通过将C-C复合基底嵌入反应性粉末中并加热陶瓷粉末来形成陶瓷涂层的组块胶合工艺。然而,仅涂覆所选表面(例如,制动盘的非摩擦表面)可能难以使用组块胶合技术,从而需要后处理步骤,诸如从摩擦表面磨削过量的涂层,这可能是耗时的并且增加了成本。
另外或另选地,本文所述的沉积技术可包括与需要陶瓷阻挡涂层破裂并且使得磷酸盐基抗氧化剂涂层能够渗透到裂纹中的其他技术相比的优点。然而,如上所述,由于五氧化二磷挥发,磷酸盐基涂层可具有有限的温度能力。
已经描述了各种示例。这些实施例和其他实施例在以下权利要求的范围内。
Claims (10)
1.一种制品,包括:
碳-碳复合基底,所述碳-碳复合基底限定摩擦表面和非摩擦表面;
粘结涂层,所述粘结涂层被设置在所述非摩擦表面上;以及
抗氧化剂涂层,所述抗氧化剂涂层被设置在所述粘结涂层的至少一部分上,其中所述抗氧化剂涂层包含二硅酸镱和烧结助剂。
2.根据权利要求1所述的制品,其中二硅酸镱的重量百分比在约94重量百分比(重量%)至约99.9重量%的范围内,并且其中所述烧结助剂的重量百分比在所述抗氧化剂涂层的约0.1重量%至约6重量%的范围内。
3.根据权利要求1所述的制品,其中所述烧结助剂选自氧化铝、莫来石、堇青石以及它们的组合。
4.根据权利要求1所述的制品,其中所述抗氧化剂涂层的热膨胀系数在约3.5份/百万/摄氏度(ppm/C)至约4.5ppm/℃的范围内。
5.根据权利要求1所述的制品,其中所述抗氧化剂涂层在高达至少约3000℉(1645℃)的温度下为稳定的。
6.一种方法,包括:
在碳-碳复合基底的非摩擦表面上形成粘结涂层;
在所述粘结涂层的至少一部分上施加抗氧化剂涂层,所述抗氧化剂涂层包含二硅酸镱和烧结助剂。
7.根据权利要求6所述的方法,其中形成所述粘结涂层包括将硅施加到所述C-C复合基底的非摩擦表面,所述硅能够被喷涂到所述C-C复合基底的表面上并在约2,642℉(1450℃)下真空热处理。
8.根据权利要求6所述的方法,其中所述方法还包括:
将所述二硅酸镱和所述烧结助剂共混以形成抗氧化剂涂层粉末;以及
将所述抗氧化剂涂层粉末与溶剂混合以形成抗氧化剂涂层漆。
9.根据权利要求8所述的方法,其中施加所述抗氧化剂涂层包括:
用所述抗氧化剂涂层漆刷涂、喷涂或浸涂所述碳-碳复合基底中的至少一种;以及
加热所述抗氧化剂涂层漆以从所述抗氧化剂涂层漆中蒸发基本上所有的所述溶剂以形成干燥的抗氧化剂涂层复合物。
10.根据权利要求9所述的方法,其中施加所述抗氧化剂涂层包括:
加热所述干燥的抗氧化剂涂层复合物以除去所述抗氧化剂涂层的有机组分,从而形成绿色抗氧化剂涂层复合物;以及
通过在约1485℃至约1550℃的范围内将所述绿色抗氧化剂涂层烧结约20分钟至约120分钟内的持续时间来致密化所述绿色抗氧化剂涂层复合物以形成所述抗氧化剂涂层。
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US20230312424A1 (en) * | 2022-03-30 | 2023-10-05 | Honeywell International Inc. | Direct bonded environmental barrier coatings for sic/sic composites and methods for preparing the same |
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